Code
P1170
ALFA ROMEO
P — Powertrain
Air-fuel mixture too lean | Voltage condition 2 fault
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for ALFA ROMEO
89
Browse 89 ALFA ROMEO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
ALFA ROMEO
-
ALFA ROMEO: 2024
-
ALFA ROMEO: 2023
-
Stelvio
-
ALFA ROMEO: 2022
-
Stelvio
-
ALFA ROMEO: 2021
-
Stelvio
-
ALFA ROMEO: 2020
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Code
P1170
BUICK
P — Powertrain
Bank To Bank Fuel Trim Offset
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1170
CADILLAC
P — Powertrain
Bank To Bank Fuel Trim Offset
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1170
CHEVROLET
P — Powertrain
Bank To Bank Fuel Trim Offset
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for CHEVROLET
456
Browse 456 CHEVROLET manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
CHEVROLET
-
CHEVROLET: 2020
-
Camaro
- LS, Automatic Trans
- LS, Standard Trans
- LT, 2D Convertible, 2.0L Eng VIN X, Automatic Trans
- LT, 2D Convertible, 2.0L Eng VIN X, Standard Trans
- LT, 2D Convertible, 3.6L Eng VIN S, Automatic Trans
- LT, 2D Convertible, 3.6L Eng VIN S, Standard Trans
- LT, 2D Coupe, 2.0L Eng VIN X, Automatic Trans
- LT, 2D Coupe, 2.0L Eng VIN X, Standard Trans
- LT, 2D Coupe, 3.6L Eng VIN S, Automatic Trans
- LT, 2D Coupe, 3.6L Eng VIN S, Standard Trans
- LT1, 2D Convertible, Automatic Trans
- LT1, 2D Convertible, Standard Trans
- LT1, 2D Coupe, Automatic Trans
- LT1, 2D Coupe, Standard Trans
- SS, 2D Convertible, Automatic Trans
- SS, 2D Convertible, Standard Trans
- SS, 2D Coupe, Automatic Trans
- SS, 2D Coupe, Standard Trans
- ZL1, 2D Convertible, Automatic Trans
- ZL1, 2D Convertible, Standard Trans
- ZL1, 2D Coupe, Automatic Trans
- ZL1, 2D Coupe, Standard Trans
-
Colorado
- 2020 Colorado Base
- LT, 4D Pickup Crew Cab, 2.5L Eng VIN A · 2.5L Eng VIN A2020: Colorado LT
- LT, 4D Pickup Crew Cab, 2.8L Eng VIN 1, 4WD
- LT, 4D Pickup Crew Cab, 2.8L Eng VIN 1, RWD
- LT, 4D Pickup Crew Cab, 3.6L Eng VIN N, 4WD
- LT, 4D Pickup Crew Cab, 3.6L Eng VIN N, RWD
- LT, 4D Pickup Extra Cab, 2.5L Eng VIN A, 4WD
- LT, 4D Pickup Extra Cab, 2.5L Eng VIN A, RWD
- LT, 4D Pickup Extra Cab, 3.6L Eng VIN N, 4WD
- LT, 4D Pickup Extra Cab, 3.6L Eng VIN N, RWD
- WT, 4D Pickup Crew Cab, 2.5L Eng VIN A · 2.5L Eng VIN A2020: Colorado WT
- WT, 4D Pickup Crew Cab, 2.8L Eng VIN 1, 4WD
- WT, 4D Pickup Crew Cab, 2.8L Eng VIN 1, RWD
- WT, 4D Pickup Crew Cab, 3.6L Eng VIN N, 4WD
- WT, 4D Pickup Crew Cab, 3.6L Eng VIN N, RWD
- WT, 4D Pickup Extra Cab, 2.5L Eng VIN A, 4WD
- WT, 4D Pickup Extra Cab, 2.5L Eng VIN A, RWD
- WT, 4D Pickup Extra Cab, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Colorado WT
- WT, 4D Pickup Extra Cab, 3.6L Eng VIN N, 4WD
- WT, 4D Pickup Extra Cab, 3.6L Eng VIN N, RWD
- Z71, 4D Pickup Crew Cab, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Colorado Z71
- Z71, 4D Pickup Crew Cab, 3.6L Eng VIN N, 4WD
- Z71, 4D Pickup Crew Cab, 3.6L Eng VIN N, RWD
- Z71, 4D Pickup Extra Cab
- ZR2, 4D Pickup Crew Cab, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Colorado ZR2
- ZR2, 4D Pickup Crew Cab, 3.6L Eng VIN N · 3.6L Eng VIN N2020: Colorado ZR2
- ZR2, 4D Pickup Extra Cab, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Colorado ZR2
- ZR2, 4D Pickup Extra Cab, 3.6L Eng VIN N · 3.6L Eng VIN N2020: Colorado ZR2
-
Corvette
-
Express 2500
- Base, Van Cargo, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 2500 Base
- Base, Van Cargo, 4.3L Eng VIN P, Gas/Ethanol
- Base, Van Cargo, 4.3L Eng VIN P, Gas
- Base, Van Cargo, 6.0L Eng VIN B, Gas/Ethanol/CNG
- Base, Van Cargo, 6.0L Eng VIN B, Gas/Ethanol
- Base, Van Cargo, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 2500 Base
- Base, Van Cargo Extended, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 2500 Base
- Base, Van Cargo Extended, 4.3L Eng VIN P, Gas/Ethanol
- Base, Van Cargo Extended, 4.3L Eng VIN P, Gas
- Base, Van Cargo Extended, 6.0L Eng VIN B, Gas/Ethanol/CNG
- Base, Van Cargo Extended, 6.0L Eng VIN B, Gas/Ethanol
- Base, Van Cargo Extended, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 2500 Base
- LS, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 2500 LS
- LS, 4.3L Eng VIN P, Gas/Ethanol
- LS, 4.3L Eng VIN P, Gas
- LS, 6.0L Eng VIN B, Gas/Ethanol/CNG
- LS, 6.0L Eng VIN B, Gas/Ethanol
- LS, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 2500 LS
- LT, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 2500 LT
- LT, 4.3L Eng VIN P, Gas/Ethanol
- LT, 4.3L Eng VIN P, Gas
- LT, 6.0L Eng VIN B, Gas/Ethanol/CNG
- LT, 6.0L Eng VIN B, Gas/Ethanol
- LT, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 2500 LT
-
Express 3500
- Base, Cutaway, 4.3L Eng VIN P, Gas/Ethanol
- Base, Cutaway, 4.3L Eng VIN P, Gas
- Base, Cutaway, 6.0L Eng VIN B, Gas/Ethanol/CNG
- Base, Cutaway, 6.0L Eng VIN B, Gas
- Base, Cutaway, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 3500 Base
- Base, Van Cargo, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 3500 Base
- Base, Van Cargo, 4.3L Eng VIN P, Gas/Ethanol
- Base, Van Cargo, 4.3L Eng VIN P, Gas
- Base, Van Cargo, 6.0L Eng VIN B, Gas/Ethanol/CNG
- Base, Van Cargo, 6.0L Eng VIN B, Gas/Ethanol
- Base, Van Cargo, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 3500 Base
- Base, Van Cargo Extended, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 3500 Base
- Base, Van Cargo Extended, 4.3L Eng VIN P, Gas/Ethanol
- Base, Van Cargo Extended, 4.3L Eng VIN P, Gas
- Base, Van Cargo Extended, 6.0L Eng VIN B, Gas/Ethanol/CNG
- Base, Van Cargo Extended, 6.0L Eng VIN B, Gas/Ethanol
- Base, Van Cargo Extended, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 3500 Base
- LS, Van Passenger, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 3500 LS
- LS, Van Passenger, 4.3L Eng VIN P, Gas/Ethanol
- LS, Van Passenger, 4.3L Eng VIN P, Gas
- LS, Van Passenger, 6.0L Eng VIN B, Gas/Ethanol/CNG
- LS, Van Passenger, 6.0L Eng VIN B, Gas/Ethanol
- LS, Van Passenger, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 3500 LS
- LS, Van Passenger Extended, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 3500 LS
- LS, Van Passenger Extended, 4.3L Eng VIN P, Gas/Ethanol
- LS, Van Passenger Extended, 4.3L Eng VIN P, Gas
- LS, Van Passenger Extended, 6.0L Eng VIN B, Gas/Ethanol/CNG
- LS, Van Passenger Extended, 6.0L Eng VIN B, Gas/Ethanol
- LS, Van Passenger Extended, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 3500 LS
- LT, Van Passenger, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 3500 LT
- LT, Van Passenger, 4.3L Eng VIN P, Gas/Ethanol
- LT, Van Passenger, 4.3L Eng VIN P, Gas
- LT, Van Passenger, 6.0L Eng VIN B, Gas/Ethanol/CNG
- LT, Van Passenger, 6.0L Eng VIN B, Gas/Ethanol
- LT, Van Passenger, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 3500 LT
- LT, Van Passenger Extended, 2.8L Eng VIN 1 · 2.8L Eng VIN 12020: Express 3500 LT
- LT, Van Passenger Extended, 4.3L Eng VIN P, Gas/Ethanol
- LT, Van Passenger Extended, 4.3L Eng VIN P, Gas
- LT, Van Passenger Extended, 6.0L Eng VIN B, Gas/Ethanol/CNG
- LT, Van Passenger Extended, 6.0L Eng VIN B, Gas/Ethanol
- LT, Van Passenger Extended, 6.0L Eng VIN G · 6.0L Eng VIN G2020: Express 3500 LT
-
Silverado 1500
- Custom, 4D Pickup Crew Cab, 2.7L Eng VIN K, 4WD
- Custom, 4D Pickup Crew Cab, 2.7L Eng VIN K, RWD
- Custom, 4D Pickup Crew Cab, 4.3L Eng VIN H, 4WD
- Custom, 4D Pickup Crew Cab, 4.3L Eng VIN H, RWD
- Custom, 4D Pickup Crew Cab, 5.3L Eng VIN F, 4WD
- Custom, 4D Pickup Crew Cab, 5.3L Eng VIN F, RWD
- Custom, 4D Pickup Extra Cab, 2.7L Eng VIN K, 4WD
- Custom, 4D Pickup Extra Cab, 2.7L Eng VIN K, RWD
- Custom, 4D Pickup Extra Cab, 4.3L Eng VIN H, 4WD
- Custom, 4D Pickup Extra Cab, 4.3L Eng VIN H, RWD
- Custom, 4D Pickup Extra Cab, 5.3L Eng VIN F, 4WD
- Custom, 4D Pickup Extra Cab, 5.3L Eng VIN F, RWD
- Custom Trail Boss, 4D Pickup Crew Cab, 4.3L Eng VIN H · 4.3L Eng VIN H2020: Silverado 1500 Custom Trail Boss
- Custom Trail Boss, 4D Pickup Crew Cab, 5.3L Eng VIN F · 5.3L Eng VIN F2020: Silverado 1500 Custom Trail Boss
- Custom Trail Boss, 4D Pickup Crew Cab, 6.2L Eng VIN L · 6.2L Eng VIN L2020: Silverado 1500 Custom Trail Boss
- Custom Trail Boss, 4D Pickup Extra Cab, 4.3L Eng VIN H · 4.3L Eng VIN H2020: Silverado 1500 Custom Trail Boss
- Custom Trail Boss, 4D Pickup Extra Cab, 5.3L Eng VIN F · 5.3L Eng VIN F2020: Silverado 1500 Custom Trail Boss
- Custom Trail Boss, 4D Pickup Extra Cab, 6.2L Eng VIN L · 6.2L Eng VIN L2020: Silverado 1500 Custom Trail Boss
- High Country, 3.0L Eng VIN T, 4WD
- High Country, 3.0L Eng VIN T, RWD
- High Country, 5.3L Eng VIN D, 4WD
- High Country, 5.3L Eng VIN D, RWD
- High Country, 6.2L Eng VIN L · 6.2L Eng VIN L2020: Silverado 1500 High Country
- LT, 4D Pickup Crew Cab, 2.7L Eng VIN K, 4WD
- LT, 4D Pickup Crew Cab, 2.7L Eng VIN K, RWD
- LT, 4D Pickup Crew Cab, 3.0L Eng VIN T, 4WD
- LT, 4D Pickup Crew Cab, 3.0L Eng VIN T, RWD
- LT, 4D Pickup Crew Cab, 5.3L Eng VIN D, 4WD
- LT, 4D Pickup Crew Cab, 5.3L Eng VIN D, RWD
- LT, 4D Pickup Extra Cab, 2.7L Eng VIN K, 4WD
- LT, 4D Pickup Extra Cab, 2.7L Eng VIN K, RWD
- LT, 4D Pickup Extra Cab, 3.0L Eng VIN T, 4WD
- LT, 4D Pickup Extra Cab, 3.0L Eng VIN T, RWD
- LT, 4D Pickup Extra Cab, 5.3L Eng VIN D, 4WD
- LT, 4D Pickup Extra Cab, 5.3L Eng VIN D, RWD
- LT Trail Boss, 5.3L Eng VIN D · 5.3L Eng VIN D2020: Silverado 1500 LT Trail Boss
- LT Trail Boss, 6.2L Eng VIN L · 6.2L Eng VIN L2020: Silverado 1500 LT Trail Boss
- LTZ, 4D Pickup Crew Cab, 3.0L Eng VIN T, 4WD
- LTZ, 4D Pickup Crew Cab, 3.0L Eng VIN T, RWD
- LTZ, 4D Pickup Crew Cab, 5.3L Eng VIN D, 4WD
- LTZ, 4D Pickup Crew Cab, 5.3L Eng VIN D, RWD
- LTZ, 4D Pickup Crew Cab, 6.2L Eng VIN L · 6.2L Eng VIN L2020: Silverado 1500 LTZ
- LTZ, 4D Pickup Extra Cab, 3.0L Eng VIN T, 4WD
- LTZ, 4D Pickup Extra Cab, 3.0L Eng VIN T, RWD
- LTZ, 4D Pickup Extra Cab, 5.3L Eng VIN D, 4WD
- LTZ, 4D Pickup Extra Cab, 5.3L Eng VIN D, RWD
- LTZ, 4D Pickup Extra Cab, 6.2L Eng VIN L · 6.2L Eng VIN L2020: Silverado 1500 LTZ
- RST, 4D Pickup Crew Cab, 2.7L Eng VIN K, 4WD
- RST, 4D Pickup Crew Cab, 2.7L Eng VIN K, RWD
- RST, 4D Pickup Crew Cab, 3.0L Eng VIN T, 4WD
- RST, 4D Pickup Crew Cab, 3.0L Eng VIN T, RWD
- RST, 4D Pickup Crew Cab, 5.3L Eng VIN D, 4WD
- RST, 4D Pickup Crew Cab, 5.3L Eng VIN D, RWD
- RST, 4D Pickup Crew Cab, 6.2L Eng VIN L · 6.2L Eng VIN L2020: Silverado 1500 RST
- RST, 4D Pickup Extra Cab, 2.7L Eng VIN K, 4WD
- RST, 4D Pickup Extra Cab, 2.7L Eng VIN K, RWD
- RST, 4D Pickup Extra Cab, 3.0L Eng VIN T, 4WD
- RST, 4D Pickup Extra Cab, 3.0L Eng VIN T, RWD
- RST, 4D Pickup Extra Cab, 5.3L Eng VIN D, 4WD
- RST, 4D Pickup Extra Cab, 5.3L Eng VIN D, RWD
- RST, 4D Pickup Extra Cab, 6.2L Eng VIN L · 6.2L Eng VIN L2020: Silverado 1500 RST
- SSV, 4WD, Gas
- SSV, 4WD, Gas/Ethanol
- SSV, RWD, Gas
- SSV, RWD, Gas/Ethanol
- WT, 2D Pickup, 4.3L Eng VIN H, 4WD, Gas/Ethanol
- WT, 2D Pickup, 4.3L Eng VIN H, 4WD, Gas
- WT, 2D Pickup, 4.3L Eng VIN H, RWD, Gas/Ethanol
- WT, 2D Pickup, 4.3L Eng VIN H, RWD, Gas
- WT, 2D Pickup, 5.3L Eng VIN F, 4WD, Gas/Ethanol
- WT, 2D Pickup, 5.3L Eng VIN F, 4WD, Gas
- WT, 2D Pickup, 5.3L Eng VIN F, RWD, Gas/Ethanol
- WT, 2D Pickup, 5.3L Eng VIN F, RWD, Gas
- WT, 4D Pickup Crew Cab, 2.7L Eng VIN K, 4WD
- WT, 4D Pickup Crew Cab, 2.7L Eng VIN K, RWD
- WT, 4D Pickup Crew Cab, 4.3L Eng VIN H, 4WD, Gas/Ethanol
- WT, 4D Pickup Crew Cab, 4.3L Eng VIN H, 4WD, Gas
- WT, 4D Pickup Crew Cab, 4.3L Eng VIN H, RWD, Gas/Ethanol
- WT, 4D Pickup Crew Cab, 4.3L Eng VIN H, RWD, Gas
- WT, 4D Pickup Crew Cab, 5.3L Eng VIN F, 4WD, Gas/Ethanol
- WT, 4D Pickup Crew Cab, 5.3L Eng VIN F, 4WD, Gas
- WT, 4D Pickup Crew Cab, 5.3L Eng VIN F, RWD, Gas/Ethanol
- WT, 4D Pickup Crew Cab, 5.3L Eng VIN F, RWD, Gas
- WT, 4D Pickup Extra Cab, 2.7L Eng VIN K, 4WD
- WT, 4D Pickup Extra Cab, 2.7L Eng VIN K, RWD
- WT, 4D Pickup Extra Cab, 4.3L Eng VIN H, 4WD, Gas/Ethanol
- WT, 4D Pickup Extra Cab, 4.3L Eng VIN H, 4WD, Gas
- WT, 4D Pickup Extra Cab, 4.3L Eng VIN H, RWD, Gas/Ethanol
- WT, 4D Pickup Extra Cab, 4.3L Eng VIN H, RWD, Gas
- WT, 4D Pickup Extra Cab, 5.3L Eng VIN F, 4WD, Gas/Ethanol
- WT, 4D Pickup Extra Cab, 5.3L Eng VIN F, 4WD, Gas
- WT, 4D Pickup Extra Cab, 5.3L Eng VIN F, RWD, Gas/Ethanol
- WT, 4D Pickup Extra Cab, 5.3L Eng VIN F, RWD, Gas
-
Silverado 2500 HD
- Custom, 4D Pickup Crew Cab, 4WD
- Custom, 4D Pickup Crew Cab, RWD
- Custom, 4D Pickup Extra Cab, 4WD
- Custom, 4D Pickup Extra Cab, RWD
- High Country, 6.6L Eng VIN 7 · 6.6L Eng VIN 72020: Silverado 2500 HD High Country
- High Country, 6.6L Eng VIN Y · 6.6L Eng VIN Y2020: Silverado 2500 HD High Country
- LT, 2D Pickup, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- LT, 2D Pickup, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- LT, 2D Pickup, 6.6L Eng VIN 7, RWD
- LT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 2D Pickup, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- LT, 2D Pickup, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, RWD
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, RWD
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- LTZ, 4D Pickup Crew Cab, 6.6L Eng VIN 7, 4WD
- LTZ, 4D Pickup Crew Cab, 6.6L Eng VIN 7, RWD
- LTZ, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD
- LTZ, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD
- LTZ, 4D Pickup Extra Cab, 6.6L Eng VIN 7, 4WD
- LTZ, 4D Pickup Extra Cab, 6.6L Eng VIN 7, RWD
- LTZ, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD
- LTZ, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD
- WT, 2D Pickup, 6.6L Eng VIN 7, 4WD
- WT, 2D Pickup, 6.6L Eng VIN 7, RWD
- WT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGM
- WT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGU
- WT, 2D Pickup, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- WT, 2D Pickup, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, 4WD
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, RWD
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGM
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGU
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, 4WD
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, RWD
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGM
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGU
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
-
Silverado 3500 HD
- High Country, 6.6L Eng VIN 7 · 6.6L Eng VIN 72020: Silverado 3500 HD High Country
- High Country, 6.6L Eng VIN Y · 6.6L Eng VIN Y2020: Silverado 3500 HD High Country
- LT, 2D Cab Chassis, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- LT, 2D Cab Chassis, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- LT, 2D Cab Chassis, 6.6L Eng VIN 7, RWD
- LT, 2D Cab Chassis, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 2D Cab Chassis, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 2D Cab Chassis, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 2D Cab Chassis, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 2D Cab Chassis, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- LT, 2D Cab Chassis, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- LT, 2D Pickup, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- LT, 2D Pickup, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- LT, 2D Pickup, 6.6L Eng VIN 7, RWD
- LT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 2D Pickup, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- LT, 2D Pickup, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- LT, 4D Cab Chassis, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- LT, 4D Cab Chassis, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- LT, 4D Cab Chassis, 6.6L Eng VIN 7, RWD
- LT, 4D Cab Chassis, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Cab Chassis, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Cab Chassis, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Cab Chassis, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Cab Chassis, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- LT, 4D Cab Chassis, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, RWD
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, RWD
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- LT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- LTZ, 6.6L Eng VIN 7, 4WD
- LTZ, 6.6L Eng VIN 7, RWD
- LTZ, 6.6L Eng VIN Y, 4WD
- LTZ, 6.6L Eng VIN Y, RWD
- WT, 2D Cab Chassis, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- WT, 2D Cab Chassis, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- WT, 2D Cab Chassis, 6.6L Eng VIN 7, RWD
- WT, 2D Cab Chassis, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- WT, 2D Cab Chassis, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- WT, 2D Cab Chassis, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- WT, 2D Cab Chassis, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- WT, 2D Cab Chassis, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- WT, 2D Cab Chassis, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- WT, 2D Pickup, 6.6L Eng VIN 7, 4WD
- WT, 2D Pickup, 6.6L Eng VIN 7, RWD
- WT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGM
- WT, 2D Pickup, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGU
- WT, 2D Pickup, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- WT, 2D Pickup, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- WT, 4D Cab Chassis, 6.6L Eng VIN 7, 4WD, Automatic T/Case Control
- WT, 4D Cab Chassis, 6.6L Eng VIN 7, 4WD, Part Time T/Case Control
- WT, 4D Cab Chassis, 6.6L Eng VIN 7, RWD
- WT, 4D Cab Chassis, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGM
- WT, 4D Cab Chassis, 6.6L Eng VIN Y, 4WD, Automatic T/Case Control, Trans Mfr CD 10L1000/MGU
- WT, 4D Cab Chassis, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGM
- WT, 4D Cab Chassis, 6.6L Eng VIN Y, 4WD, Part Time T/Case Control, Trans Mfr CD 10L1000/MGU
- WT, 4D Cab Chassis, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- WT, 4D Cab Chassis, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, 4WD
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN 7, RWD
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGM
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGU
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- WT, 4D Pickup Crew Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, 4WD
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN 7, RWD
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGM
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, 4WD, Trans Mfr CD 10L1000/MGU
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGM
- WT, 4D Pickup Extra Cab, 6.6L Eng VIN Y, RWD, Trans Mfr CD 10L1000/MGU
-
Suburban
- FL, 4WD, Gas
- FL, 4WD, Gas/Ethanol
- FL, RWD, Gas
- FL, RWD, Gas/Ethanol
- LS, 4WD, Gas
- LS, 4WD, Gas/Ethanol
- LS, RWD, Gas
- LS, RWD, Gas/Ethanol
- LT, 4WD, Gas
- LT, 4WD, Gas/Ethanol
- LT, RWD, Gas
- LT, RWD, Gas/Ethanol
- Premier, 5.3L Eng VIN C, 4WD, Gas/Ethanol
- Premier, 5.3L Eng VIN C, 4WD, Gas
- Premier, 5.3L Eng VIN C, RWD, Gas/Ethanol
- Premier, 5.3L Eng VIN C, RWD, Gas
- Premier, 6.2L Eng VIN J, 4WD
- Premier, 6.2L Eng VIN J, RWD
-
Tahoe
- FL, 4WD, Gas
- FL, 4WD, Gas/Ethanol
- FL, RWD, Gas
- FL, RWD, Gas/Ethanol
- LS, 4WD, Gas
- LS, 4WD, Gas/Ethanol
- LS, RWD, Gas
- LS, RWD, Gas/Ethanol
- LT, 4WD, Gas
- LT, 4WD, Gas/Ethanol
- LT, RWD, Gas
- LT, RWD, Gas/Ethanol
- PPV, 4WD, Gas
- PPV, 4WD, Gas/Ethanol
- PPV, RWD, Gas
- PPV, RWD, Gas/Ethanol
- Premier, 5.3L Eng VIN C, 4WD, Gas/Ethanol
- Premier, 5.3L Eng VIN C, 4WD, Gas
- Premier, 5.3L Eng VIN C, RWD, Gas/Ethanol
- Premier, 5.3L Eng VIN C, RWD, Gas
- Premier, 6.2L Eng VIN J, 4WD
- Premier, 6.2L Eng VIN J, RWD
- SSV, Gas
- SSV, Gas/Ethanol
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Code
P1170
CHRYSLER
P — Powertrain
Bank To Bank Fuel Trim Offset
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
P1170
DAEWOO
P — Powertrain
BAROMETRIC PRESSURE SNSR FLT
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for DAEWOO
75
Browse 75 DAEWOO manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
DAEWOO
-
DAEWOO: 2001
-
Leganza
-
DAEWOO: 2000
-
Leganza
-
DAEWOO: 1999
-
Lanos
- S, 2D Hatchback, Automatic
- S, 2D Hatchback, Standard
- S, 4D Sedan, Automatic
- S, 4D Sedan, Standard
- SE, 2D Hatchback, Automatic
- SE, 2D Hatchback, Standard
- SE, 4D Sedan, Automatic
- SE, 4D Sedan, Standard
- SX, 2D Hatchback, Automatic
- SX, 2D Hatchback, Standard
- SX, 4D Sedan, Automatic
- SX, 4D Sedan, Standard
-
Leganza
-
Nubira
- CDX, 4D Hatchback, Automatic
- CDX, 4D Hatchback, Standard
- CDX, 4D Sedan, Automatic
- CDX, 4D Sedan, Standard
- CDX, 4D Wagon, Automatic
- CDX, 4D Wagon, Standard
- SX, 4D Hatchback, Automatic
- SX, 4D Hatchback, Standard
- SX, 4D Sedan, Automatic
- SX, 4D Sedan, Standard
- SX, 4D Wagon, Automatic
- SX, 4D Wagon, Standard
-
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Code
P1170
FIAT
P — Powertrain
Air-fuel mixture too lean | Voltage condition 2 fault
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for FIAT
26
Browse 26 FIAT manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
FIAT
-
FIAT: 2022
-
500X
-
-
FIAT: 2021
-
500X
-
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Code
P1170
FORD
P — Powertrain
ESO Engine Shut Off Solenoid Fault
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1170
GM
P — Powertrain
Bank To Bank Fuel Trim Offset
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1170
GMC
P — Powertrain
Bank To Bank Fuel Trim Offset
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1170
HUMMER
P — Powertrain
Bank to Bank Fuel Trim Offset
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HUMMER
-
HUMMER: 2009
-
HUMMER: 2008
-
HUMMER: 2007
-
HUMMER: 2005
-
HUMMER: 2004
-
HUMMER: 2000
-
HUMMER: 1999
-
HUMMER: 1994
-
HUMMER: 1993
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Code
P1170
KIA
P — Powertrain
HO2S11 Circuit Voltage Stuck At Mid-Range
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1170
LINCOLN
P — Powertrain
ESO Engine Shut Off Solenoid Fault
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for LINCOLN
166
Browse 166 LINCOLN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
LINCOLN
-
LINCOLN: 2024
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LINCOLN: 2023
-
LINCOLN: 2022
-
LINCOLN: 2021
-
LINCOLN: 2020
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Continental
- Base, AWD
- Base, FWD
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- Black Label, 3.0L Eng VIN C · 3.0L Eng VIN C2020: Continental Black Label
- Livery, AWD
- Livery, FWD
- Reserve, 2.7L Eng VIN P, AWD
- Reserve, 2.7L Eng VIN P, FWD
- Reserve, 3.0L Eng VIN C · 3.0L Eng VIN C2020: Continental Reserve
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Code
P1170
MAZDA
P — Powertrain
HO2S Bank 1 Sensor 1 Circuit Fixed Bank 1 Sensor 1
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
P1170
MERCURY
P — Powertrain
ESO Engine Shut Off Solenoid Fault
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Manual library for MERCURY
296
Browse 296 MERCURY manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
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Code
P1170
OLDSMOBILE
P — Powertrain
Bank To Bank Fuel Trim Offset
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1170
Other
P — Powertrain
ESO - Engine Shut Off Solenoid Fault
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Repair manuals
Brands with available manuals
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Code
P1170
SAAB
P — Powertrain
Closed Loop, Malfunction
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1170
SATURN
P — Powertrain
Bank To Bank Fuel Trim Offset
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1170
SCION
P — Powertrain
Fuel system too lean
AI status
Completed
Completed
100%
Causes
- Intake vacuum leak or unmetered air (hoses, gasket, PCV)
- Faulty or contaminated mass air flow (MAF) or MAP sensor
- Low fuel pressure (fuel pump, pressure regulator, clogged filter)
- Partially clogged or leaking fuel injector(s)
- Faulty oxygen (O2/lambda) sensor (signal bias/slow response)
- Exhaust leak upstream of O2 sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Poor idle quality or rough running
- Hesitation or lack of power under acceleration
- Reduced fuel economy
- Occasional misfire or stumble
- Possible increased NOx / catalytic converter stress over time
What to check
- Retrieve freeze frame and live data with a scan tool; record short‑ and long‑term fuel trim (STFT / LTFT) and O2 sensor voltages
- Visual inspection for vacuum/intake leaks, cracked hoses, loose clamps and intake manifold gasket leaks
- Inspect MAF sensor for contamination and wiring/connectors for damage
- Perform fuel pressure test at fuel rail under key ON and engine running conditions
- Smoke test intake and vacuum system to find unmetered air leaks
- Check for exhaust leaks upstream of the upstream O2 sensor
Signal parameters
- Upstream O2 sensor voltage low/lean bias: typically below ~0.1–0.2 V (should switch toward 0.7–0.9 V when rich)
- Slow or no switching of upstream O2 sensor during closed-loop operation
- Positive long-term fuel trim (LTFT) > +10% indicates compensating for lean condition
- MAF grams/sec lower than expected for given RPM/load
- Fuel rail pressure lower than specification (compare to OEM data)
Diagnostic algorithm
- Read and record all stored codes and freeze frame data; note whether code is bank-specific or sensor-specific.
- With a scan tool, monitor live data: STFT/LTFT, upstream O2 sensor voltage and response, MAF or MAP readings, and commanded fuel trim behavior during varied load.
- Visually inspect intake tract, vacuum lines, PCV and intake manifold for leaks or damage; repair obvious issues.
- Perform a smoke test on the intake/vacuum system to locate hidden leaks.
- Check fuel pressure at the rail: compare to OEM spec at key ON and engine running. Repair/replace pump, regulator or filter if low.
- Inspect, clean or test MAF sensor; temporarily disconnect MAF to see if trims change (use caution & refer to model-specific procedure).
- Verify upstream O2 sensor operation: measure voltage swings and heater function; compare response time to spec. Replace sensor if signal is slow/biased.
- Inspect exhaust upstream of the sensor for leaks that can confuse the O2 signal.
- Repair wiring or connector faults found; clear codes and perform a road test under load to confirm the issue is resolved.
- If repairs do not clear the code, consider ECU updates or deeper fuel system diagnostics (injector flow testing, pressure regulator bench test).
Likely causes
- Unmetered air intake / vacuum leak
- Faulty or contaminated MAF sensor
- Low fuel pressure or restricted fuel supply
- Aging or failing upstream O2 sensor reporting low voltage
- Exhaust leak near upstream O2 sensor
Fault status
Status
Air–fuel mixture lean condition detected — voltage/condition fault (Condition 2). MIL set.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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