Code
P2097
Generic
P — Powertrain
Post Catalyst Fuel Trim System Too Rich Bank 1
AI status
Completed
Completed
100%
Causes
- Faulty or contaminated downstream O2 sensor (Bank 1 sensor 2)
- Short, open, or poor connection in downstream O2 sensor wiring or connector
- Actual rich running condition (leaking/ sticking injector, excessive fuel pressure, faulty fuel pressure regulator)
- MAF or MAP sensor errors causing over-fueling
- Stuck open purge valve or EVAP system fault introducing excess fuel vapor
- Engine coolant temperature sensor reporting cold causing rich mixture
Symptoms
- Check Engine Light / MIL illuminated
- Decreased fuel economy
- Strong fuel smell or black exhaust smoke
- Possible rough idle or hesitation under load (if rich is significant)
- Failed emissions test
What to check
- Read and record freeze frame and stored PID data; note concurrent codes (e.g., O2, fuel trim, catalyst codes)
- Scan live data: upstream (Bank1 sensor1) and downstream (Bank1 sensor2) O2 voltages and switching behavior
- Check short-term and long-term fuel trims (STFT/LTFT) and any Post‑Catalyst Fuel Trim (PCFT) values if available
- Inspect downstream O2 sensor wiring, connector, and ground for damage, corrosion, or shorts
- Measure fuel rail pressure at idle and under load with a fuel pressure gauge
- Inspect intake system and MAF/MAP sensors for contamination or incorrect readings
Signal parameters
- Upstream O2 (Bank1 S1) typical switching: ~0.1–0.9 V (rapid oscillation) for closed‑loop operation
- Downstream O2 (Bank1 S2) typical: lower amplitude, more stable; averaged voltage often below ~0.45 V — prolonged elevated average or switching like upstream is abnormal
- Short Term Fuel Trim (STFT): normally near 0% (typical acceptable roughly -10% to +10%)
- Long Term Fuel Trim (LTFT): normally near 0% (outside ±10–15% suggests system issue)
- Post‑Catalyst Fuel Trim (where available): normally near 0%; many systems will set a P2097 if PCFT or downstream sensor indicates a rich bias beyond manufacturer threshold (example thresholds commonly in the ±10% range or sustained downstream voltage >~0.45 V — check OEM spec)
Diagnostic algorithm
- Retrieve codes and freeze‑frame; note other stored O2, fuel trim, or catalyst codes.
- Examine downstream O2 sensor wiring/connectors for damage, corrosion, shorts to power, or poor ground. Repair as needed.
- Observe live data at idle and during a load snap: compare upstream and downstream O2 sensor voltages. If downstream mirrors upstream switching, suspect catalyst degradation or sensor fault.
- Check STFT and LTFT. Negative large trims indicate the PCM is removing fuel because the engine runs rich; positive trims indicate lean. Use these to focus upstream fuel delivery tests.
- Measure fuel pressure with a gauge (static and under load) to confirm within spec. Investigate high fuel pressure or leaking injector(s) if pressure high or rail leaking.
- Inspect and test fuel injectors for leakage/seepage or stuck open operation (leakdown test, resistance check, and injector balance if necessary).
- Check MAF/MAP and coolant temp sensor readings vs. expected. Clean or replace contaminated MAF; verify correct sensor voltages/outputs.
- Verify EVAP purge valve is not stuck open and introducing excess fuel vapors.
- If sensor wiring and fuel/air systems check OK, test downstream O2 sensor operation (heater circuit, response time). Replace sensor if heater failed or sensor is contaminated/slow.
- If downstream O2 sensor is functioning but PCFT remains rich and upstream behavior is normal, inspect catalytic converter for damage or contamination; consider catalyst efficiency test or replacement if required.
- Clear codes and perform drive cycle to verify repair. Re-scan and confirm system returns to expected parameters.
Likely causes
- Contaminated or failed downstream oxygen sensor
- Leaking fuel injector(s) or leaking fuel rail/fuel pressure regulator causing rich fuel delivery
- High fuel pressure from faulty fuel pressure regulator or fuel pump
- Wiring short to 5V or ground, poor ground at the downstream O2 sensor
- Catalyst degraded (downstream O2 resembling upstream behavior)
- Incorrect MAF/MAP or coolant temp signal causing over-fueling
Fault status
Status
Post‑catalyst fuel trim indicates the system is running richer than expected on Bank 1. Possible causes include a bad or contaminated downstream O2 sensor, wiring faults, actual rich condition (fuel pressure, injectors, MAF/MAP), or catalytic converter degradation. Further testing required.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
Similar codes
Repair manuals
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Code
P2097
HUMMER
P — Powertrain
Post Catalyst Fuel Trim System High Limit
AI status
Completed
Completed
100%
Causes
- Faulty or contaminated downstream O2 sensor (Bank 1 sensor 2)
- Short, open, or poor connection in downstream O2 sensor wiring or connector
- Actual rich running condition (leaking/ sticking injector, excessive fuel pressure, faulty fuel pressure regulator)
- MAF or MAP sensor errors causing over-fueling
- Stuck open purge valve or EVAP system fault introducing excess fuel vapor
- Engine coolant temperature sensor reporting cold causing rich mixture
Symptoms
- Check Engine Light / MIL illuminated
- Decreased fuel economy
- Strong fuel smell or black exhaust smoke
- Possible rough idle or hesitation under load (if rich is significant)
- Failed emissions test
What to check
- Read and record freeze frame and stored PID data; note concurrent codes (e.g., O2, fuel trim, catalyst codes)
- Scan live data: upstream (Bank1 sensor1) and downstream (Bank1 sensor2) O2 voltages and switching behavior
- Check short-term and long-term fuel trims (STFT/LTFT) and any Post‑Catalyst Fuel Trim (PCFT) values if available
- Inspect downstream O2 sensor wiring, connector, and ground for damage, corrosion, or shorts
- Measure fuel rail pressure at idle and under load with a fuel pressure gauge
- Inspect intake system and MAF/MAP sensors for contamination or incorrect readings
Signal parameters
- Upstream O2 (Bank1 S1) typical switching: ~0.1–0.9 V (rapid oscillation) for closed‑loop operation
- Downstream O2 (Bank1 S2) typical: lower amplitude, more stable; averaged voltage often below ~0.45 V — prolonged elevated average or switching like upstream is abnormal
- Short Term Fuel Trim (STFT): normally near 0% (typical acceptable roughly -10% to +10%)
- Long Term Fuel Trim (LTFT): normally near 0% (outside ±10–15% suggests system issue)
- Post‑Catalyst Fuel Trim (where available): normally near 0%; many systems will set a P2097 if PCFT or downstream sensor indicates a rich bias beyond manufacturer threshold (example thresholds commonly in the ±10% range or sustained downstream voltage >~0.45 V — check OEM spec)
Diagnostic algorithm
- Retrieve codes and freeze‑frame; note other stored O2, fuel trim, or catalyst codes.
- Examine downstream O2 sensor wiring/connectors for damage, corrosion, shorts to power, or poor ground. Repair as needed.
- Observe live data at idle and during a load snap: compare upstream and downstream O2 sensor voltages. If downstream mirrors upstream switching, suspect catalyst degradation or sensor fault.
- Check STFT and LTFT. Negative large trims indicate the PCM is removing fuel because the engine runs rich; positive trims indicate lean. Use these to focus upstream fuel delivery tests.
- Measure fuel pressure with a gauge (static and under load) to confirm within spec. Investigate high fuel pressure or leaking injector(s) if pressure high or rail leaking.
- Inspect and test fuel injectors for leakage/seepage or stuck open operation (leakdown test, resistance check, and injector balance if necessary).
- Check MAF/MAP and coolant temp sensor readings vs. expected. Clean or replace contaminated MAF; verify correct sensor voltages/outputs.
- Verify EVAP purge valve is not stuck open and introducing excess fuel vapors.
- If sensor wiring and fuel/air systems check OK, test downstream O2 sensor operation (heater circuit, response time). Replace sensor if heater failed or sensor is contaminated/slow.
- If downstream O2 sensor is functioning but PCFT remains rich and upstream behavior is normal, inspect catalytic converter for damage or contamination; consider catalyst efficiency test or replacement if required.
- Clear codes and perform drive cycle to verify repair. Re-scan and confirm system returns to expected parameters.
Likely causes
- Contaminated or failed downstream oxygen sensor
- Leaking fuel injector(s) or leaking fuel rail/fuel pressure regulator causing rich fuel delivery
- High fuel pressure from faulty fuel pressure regulator or fuel pump
- Wiring short to 5V or ground, poor ground at the downstream O2 sensor
- Catalyst degraded (downstream O2 resembling upstream behavior)
- Incorrect MAF/MAP or coolant temp signal causing over-fueling
Fault status
Status
Post‑catalyst fuel trim indicates the system is running richer than expected on Bank 1. Possible causes include a bad or contaminated downstream O2 sensor, wiring faults, actual rich condition (fuel pressure, injectors, MAF/MAP), or catalytic converter degradation. Further testing required.
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
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HUMMER: 2009
-
HUMMER: 2008
-
HUMMER: 2007
-
HUMMER: 2005
-
HUMMER: 2004
-
HUMMER: 2000
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HUMMER: 1999
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HUMMER: 1994
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HUMMER: 1993
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Code
P2097
LAND ROVER
P — Powertrain
Sub-reinput failure A bank
AI status
Completed
Completed
100%
Causes
- Faulty or contaminated downstream O2 sensor (Bank 1 sensor 2)
- Short, open, or poor connection in downstream O2 sensor wiring or connector
- Actual rich running condition (leaking/ sticking injector, excessive fuel pressure, faulty fuel pressure regulator)
- MAF or MAP sensor errors causing over-fueling
- Stuck open purge valve or EVAP system fault introducing excess fuel vapor
- Engine coolant temperature sensor reporting cold causing rich mixture
Symptoms
- Check Engine Light / MIL illuminated
- Decreased fuel economy
- Strong fuel smell or black exhaust smoke
- Possible rough idle or hesitation under load (if rich is significant)
- Failed emissions test
What to check
- Read and record freeze frame and stored PID data; note concurrent codes (e.g., O2, fuel trim, catalyst codes)
- Scan live data: upstream (Bank1 sensor1) and downstream (Bank1 sensor2) O2 voltages and switching behavior
- Check short-term and long-term fuel trims (STFT/LTFT) and any Post‑Catalyst Fuel Trim (PCFT) values if available
- Inspect downstream O2 sensor wiring, connector, and ground for damage, corrosion, or shorts
- Measure fuel rail pressure at idle and under load with a fuel pressure gauge
- Inspect intake system and MAF/MAP sensors for contamination or incorrect readings
Signal parameters
- Upstream O2 (Bank1 S1) typical switching: ~0.1–0.9 V (rapid oscillation) for closed‑loop operation
- Downstream O2 (Bank1 S2) typical: lower amplitude, more stable; averaged voltage often below ~0.45 V — prolonged elevated average or switching like upstream is abnormal
- Short Term Fuel Trim (STFT): normally near 0% (typical acceptable roughly -10% to +10%)
- Long Term Fuel Trim (LTFT): normally near 0% (outside ±10–15% suggests system issue)
- Post‑Catalyst Fuel Trim (where available): normally near 0%; many systems will set a P2097 if PCFT or downstream sensor indicates a rich bias beyond manufacturer threshold (example thresholds commonly in the ±10% range or sustained downstream voltage >~0.45 V — check OEM spec)
Diagnostic algorithm
- Retrieve codes and freeze‑frame; note other stored O2, fuel trim, or catalyst codes.
- Examine downstream O2 sensor wiring/connectors for damage, corrosion, shorts to power, or poor ground. Repair as needed.
- Observe live data at idle and during a load snap: compare upstream and downstream O2 sensor voltages. If downstream mirrors upstream switching, suspect catalyst degradation or sensor fault.
- Check STFT and LTFT. Negative large trims indicate the PCM is removing fuel because the engine runs rich; positive trims indicate lean. Use these to focus upstream fuel delivery tests.
- Measure fuel pressure with a gauge (static and under load) to confirm within spec. Investigate high fuel pressure or leaking injector(s) if pressure high or rail leaking.
- Inspect and test fuel injectors for leakage/seepage or stuck open operation (leakdown test, resistance check, and injector balance if necessary).
- Check MAF/MAP and coolant temp sensor readings vs. expected. Clean or replace contaminated MAF; verify correct sensor voltages/outputs.
- Verify EVAP purge valve is not stuck open and introducing excess fuel vapors.
- If sensor wiring and fuel/air systems check OK, test downstream O2 sensor operation (heater circuit, response time). Replace sensor if heater failed or sensor is contaminated/slow.
- If downstream O2 sensor is functioning but PCFT remains rich and upstream behavior is normal, inspect catalytic converter for damage or contamination; consider catalyst efficiency test or replacement if required.
- Clear codes and perform drive cycle to verify repair. Re-scan and confirm system returns to expected parameters.
Likely causes
- Contaminated or failed downstream oxygen sensor
- Leaking fuel injector(s) or leaking fuel rail/fuel pressure regulator causing rich fuel delivery
- High fuel pressure from faulty fuel pressure regulator or fuel pump
- Wiring short to 5V or ground, poor ground at the downstream O2 sensor
- Catalyst degraded (downstream O2 resembling upstream behavior)
- Incorrect MAF/MAP or coolant temp signal causing over-fueling
Fault status
Status
Post‑catalyst fuel trim indicates the system is running richer than expected on Bank 1. Possible causes include a bad or contaminated downstream O2 sensor, wiring faults, actual rich condition (fuel pressure, injectors, MAF/MAP), or catalytic converter degradation. Further testing required.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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Repair manuals
Manual library for LAND ROVER
320
Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
LAND ROVER
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LAND ROVER: 2022
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Defender
- 90
- 90
- 90 S
- 90 S
- 90 V8
- 90 V8
- 90 V8 Carpathian Edition
- 90 V8 Carpathian Edition
- 90 X
- 90 X
- 90 X-Dynamic HSE
- 90 X-Dynamic HSE
- 90 X-Dynamic S
- 90 X-Dynamic S
- 90 X-Dynamic SE
- 90 X-Dynamic SE
- 110
- 110
- 110 S
- 110 S
- 110 SE
- 110 SE
- 110 V8
- 110 V8
- 110 V8 Carpathian Edition
- 110 V8 Carpathian Edition
- 110 X
- 110 X
- 110 X-Dynamic SE
- 110 X-Dynamic SE
- 110 XS Edition
- 110 XS Edition
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Discovery
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Discovery R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Discovery R-Dynamic S
- S
- S
-
Discovery Sport
-
Range Rover
- Autobiography, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover Autobiography
- Autobiography, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover Autobiography
- 2022 Range Rover Base
- 2022 Range Rover Base
- First Edition
- First Edition
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover HSE Westminster
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover HSE Westminster
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover SE
- SE, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover SE
- SE, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover SE
- SV
- SV
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
- SVAutobiography Dynamic Blk.
- SVAutobiography Dynamic Blk.
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Range Rover Evoque
-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar S
-
-
LAND ROVER: 2021
-
Discovery
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Discovery R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Discovery R-Dynamic S
- S
- S
-
Discovery Sport
-
Range Rover
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Autobiography
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Autobiography
- Autobiography Fifty Edition
- Autobiography Fifty Edition
- 2021 Range Rover Base
- 2021 Range Rover Base
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover HSE
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover HSE
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover HSE Westminster
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover HSE Westminster
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
- SVAutobiography Dynamic Blk.
- SVAutobiography Dynamic Blk.
-
Range Rover Evoque
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Range Rover Sport
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography Dynamic
- HSE Dynamic
- HSE Dynamic
- HSE Silver Edition, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Sport HSE Silver Edition
- HST
- HST
- SE
- SE
- SVR
- SVR
- SVR Carbon Edition
- SVR Carbon Edition
-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar S
-
LAND ROVER: 2020
-
Defender
- 90 First Edition
- 90 First Edition
- 110 First Edition
- 110 First Edition
- 110 HSE
- 110 HSE
- 110 S
- 110 S
- 110 SE
- 110 SE
- 110 X
- 110 X
- 110, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Defender 110
- 110, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Defender 110
- 110, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Defender 110
- 110, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Defender 110
-
Discovery
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE
- HSE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE
- HSE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE
- HSE Luxury, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE Luxury
- Landmark
- Landmark
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery SE
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery SE
- SE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery SE
- SE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery SE
-
Range Rover
- Autobiography
- Autobiography
- Base, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Base
- Base, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Base
- Base, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Base
- Base, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Base
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover HSE
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover HSE
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
-
Range Rover Evoque
-
Range Rover Sport
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport Autobiography Dynamic
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport HSE
- HSE Dynamic
- HSE Dynamic
- HSE PHEV
- HSE PHEV
- HST
- HST
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport SE
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport SE
- SVR
- SVR
-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar S
- S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar S
- S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar S
- SVAutobiography Dyn.
- SVAutobiography Dyn.
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Code
P2097
MITSUBISHI
P — Powertrain
Post catalyst system too rich 1
AI status
Completed
Completed
100%
Causes
- Faulty or contaminated downstream O2 sensor (Bank 1 sensor 2)
- Short, open, or poor connection in downstream O2 sensor wiring or connector
- Actual rich running condition (leaking/ sticking injector, excessive fuel pressure, faulty fuel pressure regulator)
- MAF or MAP sensor errors causing over-fueling
- Stuck open purge valve or EVAP system fault introducing excess fuel vapor
- Engine coolant temperature sensor reporting cold causing rich mixture
Symptoms
- Check Engine Light / MIL illuminated
- Decreased fuel economy
- Strong fuel smell or black exhaust smoke
- Possible rough idle or hesitation under load (if rich is significant)
- Failed emissions test
What to check
- Read and record freeze frame and stored PID data; note concurrent codes (e.g., O2, fuel trim, catalyst codes)
- Scan live data: upstream (Bank1 sensor1) and downstream (Bank1 sensor2) O2 voltages and switching behavior
- Check short-term and long-term fuel trims (STFT/LTFT) and any Post‑Catalyst Fuel Trim (PCFT) values if available
- Inspect downstream O2 sensor wiring, connector, and ground for damage, corrosion, or shorts
- Measure fuel rail pressure at idle and under load with a fuel pressure gauge
- Inspect intake system and MAF/MAP sensors for contamination or incorrect readings
Signal parameters
- Upstream O2 (Bank1 S1) typical switching: ~0.1–0.9 V (rapid oscillation) for closed‑loop operation
- Downstream O2 (Bank1 S2) typical: lower amplitude, more stable; averaged voltage often below ~0.45 V — prolonged elevated average or switching like upstream is abnormal
- Short Term Fuel Trim (STFT): normally near 0% (typical acceptable roughly -10% to +10%)
- Long Term Fuel Trim (LTFT): normally near 0% (outside ±10–15% suggests system issue)
- Post‑Catalyst Fuel Trim (where available): normally near 0%; many systems will set a P2097 if PCFT or downstream sensor indicates a rich bias beyond manufacturer threshold (example thresholds commonly in the ±10% range or sustained downstream voltage >~0.45 V — check OEM spec)
Diagnostic algorithm
- Retrieve codes and freeze‑frame; note other stored O2, fuel trim, or catalyst codes.
- Examine downstream O2 sensor wiring/connectors for damage, corrosion, shorts to power, or poor ground. Repair as needed.
- Observe live data at idle and during a load snap: compare upstream and downstream O2 sensor voltages. If downstream mirrors upstream switching, suspect catalyst degradation or sensor fault.
- Check STFT and LTFT. Negative large trims indicate the PCM is removing fuel because the engine runs rich; positive trims indicate lean. Use these to focus upstream fuel delivery tests.
- Measure fuel pressure with a gauge (static and under load) to confirm within spec. Investigate high fuel pressure or leaking injector(s) if pressure high or rail leaking.
- Inspect and test fuel injectors for leakage/seepage or stuck open operation (leakdown test, resistance check, and injector balance if necessary).
- Check MAF/MAP and coolant temp sensor readings vs. expected. Clean or replace contaminated MAF; verify correct sensor voltages/outputs.
- Verify EVAP purge valve is not stuck open and introducing excess fuel vapors.
- If sensor wiring and fuel/air systems check OK, test downstream O2 sensor operation (heater circuit, response time). Replace sensor if heater failed or sensor is contaminated/slow.
- If downstream O2 sensor is functioning but PCFT remains rich and upstream behavior is normal, inspect catalytic converter for damage or contamination; consider catalyst efficiency test or replacement if required.
- Clear codes and perform drive cycle to verify repair. Re-scan and confirm system returns to expected parameters.
Likely causes
- Contaminated or failed downstream oxygen sensor
- Leaking fuel injector(s) or leaking fuel rail/fuel pressure regulator causing rich fuel delivery
- High fuel pressure from faulty fuel pressure regulator or fuel pump
- Wiring short to 5V or ground, poor ground at the downstream O2 sensor
- Catalyst degraded (downstream O2 resembling upstream behavior)
- Incorrect MAF/MAP or coolant temp signal causing over-fueling
Fault status
Status
Post‑catalyst fuel trim indicates the system is running richer than expected on Bank 1. Possible causes include a bad or contaminated downstream O2 sensor, wiring faults, actual rich condition (fuel pressure, injectors, MAF/MAP), or catalytic converter degradation. Further testing required.
Repair difficulty: Medium
Diagnostic time: 1.0 - 3.0 hours
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