Code
P0136
Generic
P — Powertrain
O2 Sensor Circuit Bank 1 Sensor 2
Views:
UK: 24
EN: 40
RU: 77
AI status
Completed
Completed
100%
Causes
- Open or shorted signal or heater wiring/connectors
- Corroded, loose, or damaged connector pins
- Failed O2 sensor (internal fault or contamination)
- Exhaust leak upstream of the sensor
- Heater circuit failure (if equipped)
- Powertrain Control Module (PCM) fault or poor ground
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced fuel economy (possible)
- Failed emissions test or elevated tailpipe emissions
- Possible poor idle or drivability if PCM enters limp strategies
- No obvious change in engine performance (common for downstream sensor faults)
What to check
- Read and record freeze‑frame data and stored live PIDs for both upstream and downstream O2 sensors
- Clear codes and test drive to verify code returns
- Monitor bank 1 sensor 1 and sensor 2 voltage traces with a scan tool
- Visually inspect wiring and connectors for damage, corrosion, or disconnection
- Backprobe signal and ground circuits to confirm presence of reference voltage and ground
- Measure heater circuit resistance (with sensor removed) and check for power/ground at connector
Signal parameters
- Sensor signal voltage range: approximately 0.0–1.0 V (narrowband zirconia style)
- Downstream (post‑cat) sensor should be relatively steady around ~0.3–0.6 V when catalyst is warm — it should not continuously switch like upstream sensor
- Upstream (Bank 1 Sensor 1) typically switches rapidly between ~0.1–0.9 V; downstream should show much less switching if catalyst is working
- Heater element resistance (typical range): ~1–20 Ω depending on sensor design; consult vehicle spec
- Heater supply: battery voltage present at connector when ignition is ON (or controlled by PCM/relay), and good ground
Diagnostic algorithm
- Confirm the code and note freeze‑frame. Clear codes and see if P0136 returns to rule out intermittent code.
- With a scan tool, compare live data for Bank 1 Sensor 1 (upstream) and Bank 1 Sensor 2 (downstream). Upstream should switch; downstream should be relatively steady once warm. Note anomalies.
- Visually inspect harness/connectors at the sensor and along the routing to the PCM. Repair any chafing, corrosion, or loose terminals.
- Backprobe the sensor connector: check signal reference (0–1 V range), ground, and presence of heater feed (if applicable). Look for open, short to voltage, or short to ground.
- Measure heater resistance at the sensor (unplugged). If out of specification, replace the sensor. Verify heater power/ground while monitoring for intermittent operation.
- Check for exhaust leaks upstream of the downstream sensor and repair as needed; leaks can cause false readings.
- If wiring appears good but signal is abnormal, swap with a known good downstream sensor (if available) or substitute an OE sensor to verify sensor vs harness/PCM.
- If evidence points to PCM circuit fault (rare), verify grounds and power supplies to PCM, then consult OEM wiring and consider PCM testing/repair.
- After repairs, clear codes and perform a drive cycle or warmup to confirm the fault is resolved and that downstream sensor behavior is normal.
Likely causes
- Damaged wiring or poor connector (most common)
- Failed downstream O2 sensor (age/contamination)
- Heater element open or intermittent
- Exhaust leak allowing false readings
- PCM or reference/ground problem (less common)
Fault status
Status
The powertrain control module (PCM) has detected a malfunction in the Bank 1 Sensor 2 oxygen sensor circuit. This indicates an electrical fault or sensor failure affecting the downstream oxygen sensor used to monitor catalyst performance.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Workshop Manuals
Available brands with manuals
2
AUDI 11
6-speed manual gearbox 0B1, front-wheel drive — Workshop Manual (Edition 05.2014)
Workshop Manual199,00 UAH
Audi A3 (1997) – 1.6L 4-cylinder (2‑valve) Engine Mechanical Components Service Manual (AEH, AKL, APF) – Edition 07.2002
Workshop Manual199,00 UAH
AUDI A3 (2004) Workshop Manual — 2.0L FSI Turbo (4‑cyl, 4‑valve) Engine, Mechanics — Edition 03.2017
Workshop Manual199,00 UAH
Audi A3 2004 — Electrical System (Workshop Manual, Edition 02.2018)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet – 4.2 l V8 (5‑valve, timing chains) – Workshop Manual (Mechanics) – Edition 04.2007
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet — Auxiliary Heater Workshop Manual (Edition 08.2004)
Workshop Manual199,00 UAH
Audi A4 / A4 Cabriolet (1.8T 4‑cyl turbo) — Motronic Injection & Ignition System Service Manual (Edition 01.2015)
Workshop Manual199,00 UAH
Audi A8 (2003) — Electrical System Workshop Manual (Edition 08.2014)
Workshop Manual199,00 UAH
Audi Q4 e-tron (Type F4) - Self-study Programme SSP 685
Workshop Manual199,00 UAH
Audi Q8 (2018) — Electrical System Workshop Manual (Edition 05.2019)
Workshop Manual199,00 UAH
Audi Servicing Manual — 7‑Speed Dual Clutch Transmission 0CJ / 0CL / 0CK / 0DN / 0DP / 0HL (Edition 05.2018)
Workshop Manual199,00 UAH
LAND ROVER 3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
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Code
P0136
GWM
P — Powertrain
- O2 sensor heating circuit fault (bank 1, sensor 2)
Views:
UK: 2
EN: 8
RU: 13
AI status
Completed
Completed
100%
Causes
- Open or shorted signal or heater wiring/connectors
- Corroded, loose, or damaged connector pins
- Failed O2 sensor (internal fault or contamination)
- Exhaust leak upstream of the sensor
- Heater circuit failure (if equipped)
- Powertrain Control Module (PCM) fault or poor ground
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced fuel economy (possible)
- Failed emissions test or elevated tailpipe emissions
- Possible poor idle or drivability if PCM enters limp strategies
- No obvious change in engine performance (common for downstream sensor faults)
What to check
- Read and record freeze‑frame data and stored live PIDs for both upstream and downstream O2 sensors
- Clear codes and test drive to verify code returns
- Monitor bank 1 sensor 1 and sensor 2 voltage traces with a scan tool
- Visually inspect wiring and connectors for damage, corrosion, or disconnection
- Backprobe signal and ground circuits to confirm presence of reference voltage and ground
- Measure heater circuit resistance (with sensor removed) and check for power/ground at connector
Signal parameters
- Sensor signal voltage range: approximately 0.0–1.0 V (narrowband zirconia style)
- Downstream (post‑cat) sensor should be relatively steady around ~0.3–0.6 V when catalyst is warm — it should not continuously switch like upstream sensor
- Upstream (Bank 1 Sensor 1) typically switches rapidly between ~0.1–0.9 V; downstream should show much less switching if catalyst is working
- Heater element resistance (typical range): ~1–20 Ω depending on sensor design; consult vehicle spec
- Heater supply: battery voltage present at connector when ignition is ON (or controlled by PCM/relay), and good ground
Diagnostic algorithm
- Confirm the code and note freeze‑frame. Clear codes and see if P0136 returns to rule out intermittent code.
- With a scan tool, compare live data for Bank 1 Sensor 1 (upstream) and Bank 1 Sensor 2 (downstream). Upstream should switch; downstream should be relatively steady once warm. Note anomalies.
- Visually inspect harness/connectors at the sensor and along the routing to the PCM. Repair any chafing, corrosion, or loose terminals.
- Backprobe the sensor connector: check signal reference (0–1 V range), ground, and presence of heater feed (if applicable). Look for open, short to voltage, or short to ground.
- Measure heater resistance at the sensor (unplugged). If out of specification, replace the sensor. Verify heater power/ground while monitoring for intermittent operation.
- Check for exhaust leaks upstream of the downstream sensor and repair as needed; leaks can cause false readings.
- If wiring appears good but signal is abnormal, swap with a known good downstream sensor (if available) or substitute an OE sensor to verify sensor vs harness/PCM.
- If evidence points to PCM circuit fault (rare), verify grounds and power supplies to PCM, then consult OEM wiring and consider PCM testing/repair.
- After repairs, clear codes and perform a drive cycle or warmup to confirm the fault is resolved and that downstream sensor behavior is normal.
Likely causes
- Damaged wiring or poor connector (most common)
- Failed downstream O2 sensor (age/contamination)
- Heater element open or intermittent
- Exhaust leak allowing false readings
- PCM or reference/ground problem (less common)
Fault status
Status
The powertrain control module (PCM) has detected a malfunction in the Bank 1 Sensor 2 oxygen sensor circuit. This indicates an electrical fault or sensor failure affecting the downstream oxygen sensor used to monitor catalyst performance.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P0136
HUMMER
P — Powertrain
Heated Oxygen Sensor (HO2S) Circuit Bank 1 Sensor 2
Views:
UK: 8
EN: 17
RU: 50
AI status
Completed
Completed
100%
Causes
- Open or shorted signal or heater wiring/connectors
- Corroded, loose, or damaged connector pins
- Failed O2 sensor (internal fault or contamination)
- Exhaust leak upstream of the sensor
- Heater circuit failure (if equipped)
- Powertrain Control Module (PCM) fault or poor ground
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced fuel economy (possible)
- Failed emissions test or elevated tailpipe emissions
- Possible poor idle or drivability if PCM enters limp strategies
- No obvious change in engine performance (common for downstream sensor faults)
What to check
- Read and record freeze‑frame data and stored live PIDs for both upstream and downstream O2 sensors
- Clear codes and test drive to verify code returns
- Monitor bank 1 sensor 1 and sensor 2 voltage traces with a scan tool
- Visually inspect wiring and connectors for damage, corrosion, or disconnection
- Backprobe signal and ground circuits to confirm presence of reference voltage and ground
- Measure heater circuit resistance (with sensor removed) and check for power/ground at connector
Signal parameters
- Sensor signal voltage range: approximately 0.0–1.0 V (narrowband zirconia style)
- Downstream (post‑cat) sensor should be relatively steady around ~0.3–0.6 V when catalyst is warm — it should not continuously switch like upstream sensor
- Upstream (Bank 1 Sensor 1) typically switches rapidly between ~0.1–0.9 V; downstream should show much less switching if catalyst is working
- Heater element resistance (typical range): ~1–20 Ω depending on sensor design; consult vehicle spec
- Heater supply: battery voltage present at connector when ignition is ON (or controlled by PCM/relay), and good ground
Diagnostic algorithm
- Confirm the code and note freeze‑frame. Clear codes and see if P0136 returns to rule out intermittent code.
- With a scan tool, compare live data for Bank 1 Sensor 1 (upstream) and Bank 1 Sensor 2 (downstream). Upstream should switch; downstream should be relatively steady once warm. Note anomalies.
- Visually inspect harness/connectors at the sensor and along the routing to the PCM. Repair any chafing, corrosion, or loose terminals.
- Backprobe the sensor connector: check signal reference (0–1 V range), ground, and presence of heater feed (if applicable). Look for open, short to voltage, or short to ground.
- Measure heater resistance at the sensor (unplugged). If out of specification, replace the sensor. Verify heater power/ground while monitoring for intermittent operation.
- Check for exhaust leaks upstream of the downstream sensor and repair as needed; leaks can cause false readings.
- If wiring appears good but signal is abnormal, swap with a known good downstream sensor (if available) or substitute an OE sensor to verify sensor vs harness/PCM.
- If evidence points to PCM circuit fault (rare), verify grounds and power supplies to PCM, then consult OEM wiring and consider PCM testing/repair.
- After repairs, clear codes and perform a drive cycle or warmup to confirm the fault is resolved and that downstream sensor behavior is normal.
Likely causes
- Damaged wiring or poor connector (most common)
- Failed downstream O2 sensor (age/contamination)
- Heater element open or intermittent
- Exhaust leak allowing false readings
- PCM or reference/ground problem (less common)
Fault status
Status
The powertrain control module (PCM) has detected a malfunction in the Bank 1 Sensor 2 oxygen sensor circuit. This indicates an electrical fault or sensor failure affecting the downstream oxygen sensor used to monitor catalyst performance.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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Send to email
Code
P0136
LAND ROVER
P — Powertrain
O2 circuit malfunction of the sensor (bank 1 sensor 2)
Views:
UK: 4
EN: 17
RU: 39
AI status
Completed
Completed
100%
Causes
- Open or shorted signal or heater wiring/connectors
- Corroded, loose, or damaged connector pins
- Failed O2 sensor (internal fault or contamination)
- Exhaust leak upstream of the sensor
- Heater circuit failure (if equipped)
- Powertrain Control Module (PCM) fault or poor ground
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced fuel economy (possible)
- Failed emissions test or elevated tailpipe emissions
- Possible poor idle or drivability if PCM enters limp strategies
- No obvious change in engine performance (common for downstream sensor faults)
What to check
- Read and record freeze‑frame data and stored live PIDs for both upstream and downstream O2 sensors
- Clear codes and test drive to verify code returns
- Monitor bank 1 sensor 1 and sensor 2 voltage traces with a scan tool
- Visually inspect wiring and connectors for damage, corrosion, or disconnection
- Backprobe signal and ground circuits to confirm presence of reference voltage and ground
- Measure heater circuit resistance (with sensor removed) and check for power/ground at connector
Signal parameters
- Sensor signal voltage range: approximately 0.0–1.0 V (narrowband zirconia style)
- Downstream (post‑cat) sensor should be relatively steady around ~0.3–0.6 V when catalyst is warm — it should not continuously switch like upstream sensor
- Upstream (Bank 1 Sensor 1) typically switches rapidly between ~0.1–0.9 V; downstream should show much less switching if catalyst is working
- Heater element resistance (typical range): ~1–20 Ω depending on sensor design; consult vehicle spec
- Heater supply: battery voltage present at connector when ignition is ON (or controlled by PCM/relay), and good ground
Diagnostic algorithm
- Confirm the code and note freeze‑frame. Clear codes and see if P0136 returns to rule out intermittent code.
- With a scan tool, compare live data for Bank 1 Sensor 1 (upstream) and Bank 1 Sensor 2 (downstream). Upstream should switch; downstream should be relatively steady once warm. Note anomalies.
- Visually inspect harness/connectors at the sensor and along the routing to the PCM. Repair any chafing, corrosion, or loose terminals.
- Backprobe the sensor connector: check signal reference (0–1 V range), ground, and presence of heater feed (if applicable). Look for open, short to voltage, or short to ground.
- Measure heater resistance at the sensor (unplugged). If out of specification, replace the sensor. Verify heater power/ground while monitoring for intermittent operation.
- Check for exhaust leaks upstream of the downstream sensor and repair as needed; leaks can cause false readings.
- If wiring appears good but signal is abnormal, swap with a known good downstream sensor (if available) or substitute an OE sensor to verify sensor vs harness/PCM.
- If evidence points to PCM circuit fault (rare), verify grounds and power supplies to PCM, then consult OEM wiring and consider PCM testing/repair.
- After repairs, clear codes and perform a drive cycle or warmup to confirm the fault is resolved and that downstream sensor behavior is normal.
Likely causes
- Damaged wiring or poor connector (most common)
- Failed downstream O2 sensor (age/contamination)
- Heater element open or intermittent
- Exhaust leak allowing false readings
- PCM or reference/ground problem (less common)
Fault status
Status
The powertrain control module (PCM) has detected a malfunction in the Bank 1 Sensor 2 oxygen sensor circuit. This indicates an electrical fault or sensor failure affecting the downstream oxygen sensor used to monitor catalyst performance.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
HTML Workshop Manuals AI manual library for LAND ROVER Click to show available manuals 1
LAND ROVER 2015 Discovery Sport HSE
HTML ManualWorkshop Manuals
Repair manuals for LAND ROVER
3
Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
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0
Send to email
Code
P0136
MITSUBISHI
P — Powertrain
Oxygen sensor(rear)
Views:
UK: 8
EN: 22
RU: 49
AI status
Completed
Completed
100%
Causes
- Open or shorted signal or heater wiring/connectors
- Corroded, loose, or damaged connector pins
- Failed O2 sensor (internal fault or contamination)
- Exhaust leak upstream of the sensor
- Heater circuit failure (if equipped)
- Powertrain Control Module (PCM) fault or poor ground
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced fuel economy (possible)
- Failed emissions test or elevated tailpipe emissions
- Possible poor idle or drivability if PCM enters limp strategies
- No obvious change in engine performance (common for downstream sensor faults)
What to check
- Read and record freeze‑frame data and stored live PIDs for both upstream and downstream O2 sensors
- Clear codes and test drive to verify code returns
- Monitor bank 1 sensor 1 and sensor 2 voltage traces with a scan tool
- Visually inspect wiring and connectors for damage, corrosion, or disconnection
- Backprobe signal and ground circuits to confirm presence of reference voltage and ground
- Measure heater circuit resistance (with sensor removed) and check for power/ground at connector
Signal parameters
- Sensor signal voltage range: approximately 0.0–1.0 V (narrowband zirconia style)
- Downstream (post‑cat) sensor should be relatively steady around ~0.3–0.6 V when catalyst is warm — it should not continuously switch like upstream sensor
- Upstream (Bank 1 Sensor 1) typically switches rapidly between ~0.1–0.9 V; downstream should show much less switching if catalyst is working
- Heater element resistance (typical range): ~1–20 Ω depending on sensor design; consult vehicle spec
- Heater supply: battery voltage present at connector when ignition is ON (or controlled by PCM/relay), and good ground
Diagnostic algorithm
- Confirm the code and note freeze‑frame. Clear codes and see if P0136 returns to rule out intermittent code.
- With a scan tool, compare live data for Bank 1 Sensor 1 (upstream) and Bank 1 Sensor 2 (downstream). Upstream should switch; downstream should be relatively steady once warm. Note anomalies.
- Visually inspect harness/connectors at the sensor and along the routing to the PCM. Repair any chafing, corrosion, or loose terminals.
- Backprobe the sensor connector: check signal reference (0–1 V range), ground, and presence of heater feed (if applicable). Look for open, short to voltage, or short to ground.
- Measure heater resistance at the sensor (unplugged). If out of specification, replace the sensor. Verify heater power/ground while monitoring for intermittent operation.
- Check for exhaust leaks upstream of the downstream sensor and repair as needed; leaks can cause false readings.
- If wiring appears good but signal is abnormal, swap with a known good downstream sensor (if available) or substitute an OE sensor to verify sensor vs harness/PCM.
- If evidence points to PCM circuit fault (rare), verify grounds and power supplies to PCM, then consult OEM wiring and consider PCM testing/repair.
- After repairs, clear codes and perform a drive cycle or warmup to confirm the fault is resolved and that downstream sensor behavior is normal.
Likely causes
- Damaged wiring or poor connector (most common)
- Failed downstream O2 sensor (age/contamination)
- Heater element open or intermittent
- Exhaust leak allowing false readings
- PCM or reference/ground problem (less common)
Fault status
Status
The powertrain control module (PCM) has detected a malfunction in the Bank 1 Sensor 2 oxygen sensor circuit. This indicates an electrical fault or sensor failure affecting the downstream oxygen sensor used to monitor catalyst performance.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email