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Home / DTC / P0154 — O2 Sensor Circuit No Activity Detected Bank 2 Sensor 1

P0154 — O2 Sensor Circuit No Activity Detected Bank 2 Sensor 1

Detailed page for trouble code P0154.

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Code

P0154

Generic P — Powertrain

O2 Sensor Circuit No Activity Detected Bank 2 Sensor 1

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed upstream O2 sensor (Bank 2 Sensor 1)
  • Open or shorted signal wire between sensor and PCM
  • Poor or corroded sensor connector or pin damage
  • Heater circuit failure (open heater element, blown fuse/relay, or no power/ground)
  • Exhaust leak upstream of the sensor
  • Severely contaminated sensor (oil, coolant, silicone, sulfur)

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Failed emissions test / high tailpipe emissions
  • Poor fuel economy or drivability issues (stumbling, rough idle)
  • Longer than normal catalyst warm-up
  • Possible stored related fuel trim or catalyst codes

What to check

  • Retrieve freeze frame and live data for Bank 2 Sensor 1 and related parameters
  • Verify engine is at normal operating temperature before testing O2 response
  • Visual inspection of sensor, wiring harness, and connector for damage, corrosion, or disconnection
  • Back-probe sensor signal and heater pins; check for expected voltages and continuity
  • Check for exhaust leaks upstream of the sensor
  • Scan for other DTCs (fuel trims, heater circuits, PCM faults) that can help pinpoint cause

Signal parameters

  • Expected switching voltage (warmed): ~0.1 V (lean) to ~0.9 V (rich); rapid switching when closed-loop (~5–20 times/sec depending on engine/load)
  • Stuck/flat or no signal: near 0 V or constant ~0.45 V with no switching indicates no activity
  • Heater element resistance (typical): ~2–20 ohms depending on sensor type; consult vehicle spec
  • Heater supply: battery voltage on power pin with key ON/engine running (subject to vehicle design)
  • Response time: upstream sensors should change state quickly (

Diagnostic algorithm

  1. Confirm code and obtain freeze frame/live data. Note engine temp, long/short term fuel trim, and other O2 sensors.
  2. Inspect sensor and harness for physical damage, corrosion, rodent damage, or loose connectors at Bank 2 Sensor 1.
  3. With engine warmed, monitor live O2 voltage for Bank 2 Sensor 1. If voltage is steady or absent, proceed to electrical checks.
  4. Check sensor ground and signal wire continuity to the PCM; check for short to battery or ground.
  5. Test heater circuit: measure resistance of heater element and check for battery voltage on heater supply with key ON/engine running; verify ground path.
  6. Perform wiggle test on wiring/connectors while watching live data for intermittent changes.
  7. Inspect for and repair any exhaust leaks upstream of the sensor that could affect readings.
  8. If wiring and power/ground are good and heater checks are acceptable, replace the sensor with a known good unit and confirm that operation/monitoring returns to normal.
  9. After repair, clear codes and road test to confirm sensor switches properly and code does not return. Re-check freeze frame and readiness status.

Likely causes

  • Wiring or connector fault (open, short to voltage or ground, corroded pins)
  • Failed O2 sensor (stuck or electrically open)
  • Heater circuit not powered or heater element open
  • Exhaust leak or contamination preventing correct sensor response

Fault status

⚠️ Status
O2 Sensor Circuit No Activity Detected — Bank 2 Sensor 1: PCM not seeing expected upstream oxygen sensor switching; may be open, shorted, unpowered heater, contaminated sensor, wiring/connector fault, or upstream exhaust leak.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

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Code

P0154

GWM P — Powertrain

- The oxygen sensor does not work (bank 2, sensor 1)

Brand: GWM
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed upstream O2 sensor (Bank 2 Sensor 1)
  • Open or shorted signal wire between sensor and PCM
  • Poor or corroded sensor connector or pin damage
  • Heater circuit failure (open heater element, blown fuse/relay, or no power/ground)
  • Exhaust leak upstream of the sensor
  • Severely contaminated sensor (oil, coolant, silicone, sulfur)

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Failed emissions test / high tailpipe emissions
  • Poor fuel economy or drivability issues (stumbling, rough idle)
  • Longer than normal catalyst warm-up
  • Possible stored related fuel trim or catalyst codes

What to check

  • Retrieve freeze frame and live data for Bank 2 Sensor 1 and related parameters
  • Verify engine is at normal operating temperature before testing O2 response
  • Visual inspection of sensor, wiring harness, and connector for damage, corrosion, or disconnection
  • Back-probe sensor signal and heater pins; check for expected voltages and continuity
  • Check for exhaust leaks upstream of the sensor
  • Scan for other DTCs (fuel trims, heater circuits, PCM faults) that can help pinpoint cause

Signal parameters

  • Expected switching voltage (warmed): ~0.1 V (lean) to ~0.9 V (rich); rapid switching when closed-loop (~5–20 times/sec depending on engine/load)
  • Stuck/flat or no signal: near 0 V or constant ~0.45 V with no switching indicates no activity
  • Heater element resistance (typical): ~2–20 ohms depending on sensor type; consult vehicle spec
  • Heater supply: battery voltage on power pin with key ON/engine running (subject to vehicle design)
  • Response time: upstream sensors should change state quickly (

Diagnostic algorithm

  1. Confirm code and obtain freeze frame/live data. Note engine temp, long/short term fuel trim, and other O2 sensors.
  2. Inspect sensor and harness for physical damage, corrosion, rodent damage, or loose connectors at Bank 2 Sensor 1.
  3. With engine warmed, monitor live O2 voltage for Bank 2 Sensor 1. If voltage is steady or absent, proceed to electrical checks.
  4. Check sensor ground and signal wire continuity to the PCM; check for short to battery or ground.
  5. Test heater circuit: measure resistance of heater element and check for battery voltage on heater supply with key ON/engine running; verify ground path.
  6. Perform wiggle test on wiring/connectors while watching live data for intermittent changes.
  7. Inspect for and repair any exhaust leaks upstream of the sensor that could affect readings.
  8. If wiring and power/ground are good and heater checks are acceptable, replace the sensor with a known good unit and confirm that operation/monitoring returns to normal.
  9. After repair, clear codes and road test to confirm sensor switches properly and code does not return. Re-check freeze frame and readiness status.

Likely causes

  • Wiring or connector fault (open, short to voltage or ground, corroded pins)
  • Failed O2 sensor (stuck or electrically open)
  • Heater circuit not powered or heater element open
  • Exhaust leak or contamination preventing correct sensor response

Fault status

⚠️ Status
O2 Sensor Circuit No Activity Detected — Bank 2 Sensor 1: PCM not seeing expected upstream oxygen sensor switching; may be open, shorted, unpowered heater, contaminated sensor, wiring/connector fault, or upstream exhaust leak.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0134 P0155 P0156 P0135 P0420 P0174
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Code

P0154

HUMMER P — Powertrain

Heated Oxygen Sensor (HO2S) Circuit Insufficient Activity Bank 2 Sensor 1

Brand: HUMMER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed upstream O2 sensor (Bank 2 Sensor 1)
  • Open or shorted signal wire between sensor and PCM
  • Poor or corroded sensor connector or pin damage
  • Heater circuit failure (open heater element, blown fuse/relay, or no power/ground)
  • Exhaust leak upstream of the sensor
  • Severely contaminated sensor (oil, coolant, silicone, sulfur)

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Failed emissions test / high tailpipe emissions
  • Poor fuel economy or drivability issues (stumbling, rough idle)
  • Longer than normal catalyst warm-up
  • Possible stored related fuel trim or catalyst codes

What to check

  • Retrieve freeze frame and live data for Bank 2 Sensor 1 and related parameters
  • Verify engine is at normal operating temperature before testing O2 response
  • Visual inspection of sensor, wiring harness, and connector for damage, corrosion, or disconnection
  • Back-probe sensor signal and heater pins; check for expected voltages and continuity
  • Check for exhaust leaks upstream of the sensor
  • Scan for other DTCs (fuel trims, heater circuits, PCM faults) that can help pinpoint cause

Signal parameters

  • Expected switching voltage (warmed): ~0.1 V (lean) to ~0.9 V (rich); rapid switching when closed-loop (~5–20 times/sec depending on engine/load)
  • Stuck/flat or no signal: near 0 V or constant ~0.45 V with no switching indicates no activity
  • Heater element resistance (typical): ~2–20 ohms depending on sensor type; consult vehicle spec
  • Heater supply: battery voltage on power pin with key ON/engine running (subject to vehicle design)
  • Response time: upstream sensors should change state quickly (

Diagnostic algorithm

  1. Confirm code and obtain freeze frame/live data. Note engine temp, long/short term fuel trim, and other O2 sensors.
  2. Inspect sensor and harness for physical damage, corrosion, rodent damage, or loose connectors at Bank 2 Sensor 1.
  3. With engine warmed, monitor live O2 voltage for Bank 2 Sensor 1. If voltage is steady or absent, proceed to electrical checks.
  4. Check sensor ground and signal wire continuity to the PCM; check for short to battery or ground.
  5. Test heater circuit: measure resistance of heater element and check for battery voltage on heater supply with key ON/engine running; verify ground path.
  6. Perform wiggle test on wiring/connectors while watching live data for intermittent changes.
  7. Inspect for and repair any exhaust leaks upstream of the sensor that could affect readings.
  8. If wiring and power/ground are good and heater checks are acceptable, replace the sensor with a known good unit and confirm that operation/monitoring returns to normal.
  9. After repair, clear codes and road test to confirm sensor switches properly and code does not return. Re-check freeze frame and readiness status.

Likely causes

  • Wiring or connector fault (open, short to voltage or ground, corroded pins)
  • Failed O2 sensor (stuck or electrically open)
  • Heater circuit not powered or heater element open
  • Exhaust leak or contamination preventing correct sensor response

Fault status

⚠️ Status
O2 Sensor Circuit No Activity Detected — Bank 2 Sensor 1: PCM not seeing expected upstream oxygen sensor switching; may be open, shorted, unpowered heater, contaminated sensor, wiring/connector fault, or upstream exhaust leak.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0134 P0155 P0156 P0135 P0420 P0174
Repair manuals

Manual library for HUMMER

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Code

P0154

LAND ROVER P — Powertrain

Heated oxygen sensor circuit no activity detected - bank 2 upstream

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed upstream O2 sensor (Bank 2 Sensor 1)
  • Open or shorted signal wire between sensor and PCM
  • Poor or corroded sensor connector or pin damage
  • Heater circuit failure (open heater element, blown fuse/relay, or no power/ground)
  • Exhaust leak upstream of the sensor
  • Severely contaminated sensor (oil, coolant, silicone, sulfur)

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Failed emissions test / high tailpipe emissions
  • Poor fuel economy or drivability issues (stumbling, rough idle)
  • Longer than normal catalyst warm-up
  • Possible stored related fuel trim or catalyst codes

What to check

  • Retrieve freeze frame and live data for Bank 2 Sensor 1 and related parameters
  • Verify engine is at normal operating temperature before testing O2 response
  • Visual inspection of sensor, wiring harness, and connector for damage, corrosion, or disconnection
  • Back-probe sensor signal and heater pins; check for expected voltages and continuity
  • Check for exhaust leaks upstream of the sensor
  • Scan for other DTCs (fuel trims, heater circuits, PCM faults) that can help pinpoint cause

Signal parameters

  • Expected switching voltage (warmed): ~0.1 V (lean) to ~0.9 V (rich); rapid switching when closed-loop (~5–20 times/sec depending on engine/load)
  • Stuck/flat or no signal: near 0 V or constant ~0.45 V with no switching indicates no activity
  • Heater element resistance (typical): ~2–20 ohms depending on sensor type; consult vehicle spec
  • Heater supply: battery voltage on power pin with key ON/engine running (subject to vehicle design)
  • Response time: upstream sensors should change state quickly (

Diagnostic algorithm

  1. Confirm code and obtain freeze frame/live data. Note engine temp, long/short term fuel trim, and other O2 sensors.
  2. Inspect sensor and harness for physical damage, corrosion, rodent damage, or loose connectors at Bank 2 Sensor 1.
  3. With engine warmed, monitor live O2 voltage for Bank 2 Sensor 1. If voltage is steady or absent, proceed to electrical checks.
  4. Check sensor ground and signal wire continuity to the PCM; check for short to battery or ground.
  5. Test heater circuit: measure resistance of heater element and check for battery voltage on heater supply with key ON/engine running; verify ground path.
  6. Perform wiggle test on wiring/connectors while watching live data for intermittent changes.
  7. Inspect for and repair any exhaust leaks upstream of the sensor that could affect readings.
  8. If wiring and power/ground are good and heater checks are acceptable, replace the sensor with a known good unit and confirm that operation/monitoring returns to normal.
  9. After repair, clear codes and road test to confirm sensor switches properly and code does not return. Re-check freeze frame and readiness status.

Likely causes

  • Wiring or connector fault (open, short to voltage or ground, corroded pins)
  • Failed O2 sensor (stuck or electrically open)
  • Heater circuit not powered or heater element open
  • Exhaust leak or contamination preventing correct sensor response

Fault status

⚠️ Status
O2 Sensor Circuit No Activity Detected — Bank 2 Sensor 1: PCM not seeing expected upstream oxygen sensor switching; may be open, shorted, unpowered heater, contaminated sensor, wiring/connector fault, or upstream exhaust leak.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0134 P0155 P0156 P0135 P0420 P0174
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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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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Code

P0154

MITSUBISHI P — Powertrain

Oxygen sensor2(front)no activity

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Failed upstream O2 sensor (Bank 2 Sensor 1)
  • Open or shorted signal wire between sensor and PCM
  • Poor or corroded sensor connector or pin damage
  • Heater circuit failure (open heater element, blown fuse/relay, or no power/ground)
  • Exhaust leak upstream of the sensor
  • Severely contaminated sensor (oil, coolant, silicone, sulfur)

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Failed emissions test / high tailpipe emissions
  • Poor fuel economy or drivability issues (stumbling, rough idle)
  • Longer than normal catalyst warm-up
  • Possible stored related fuel trim or catalyst codes

What to check

  • Retrieve freeze frame and live data for Bank 2 Sensor 1 and related parameters
  • Verify engine is at normal operating temperature before testing O2 response
  • Visual inspection of sensor, wiring harness, and connector for damage, corrosion, or disconnection
  • Back-probe sensor signal and heater pins; check for expected voltages and continuity
  • Check for exhaust leaks upstream of the sensor
  • Scan for other DTCs (fuel trims, heater circuits, PCM faults) that can help pinpoint cause

Signal parameters

  • Expected switching voltage (warmed): ~0.1 V (lean) to ~0.9 V (rich); rapid switching when closed-loop (~5–20 times/sec depending on engine/load)
  • Stuck/flat or no signal: near 0 V or constant ~0.45 V with no switching indicates no activity
  • Heater element resistance (typical): ~2–20 ohms depending on sensor type; consult vehicle spec
  • Heater supply: battery voltage on power pin with key ON/engine running (subject to vehicle design)
  • Response time: upstream sensors should change state quickly (

Diagnostic algorithm

  1. Confirm code and obtain freeze frame/live data. Note engine temp, long/short term fuel trim, and other O2 sensors.
  2. Inspect sensor and harness for physical damage, corrosion, rodent damage, or loose connectors at Bank 2 Sensor 1.
  3. With engine warmed, monitor live O2 voltage for Bank 2 Sensor 1. If voltage is steady or absent, proceed to electrical checks.
  4. Check sensor ground and signal wire continuity to the PCM; check for short to battery or ground.
  5. Test heater circuit: measure resistance of heater element and check for battery voltage on heater supply with key ON/engine running; verify ground path.
  6. Perform wiggle test on wiring/connectors while watching live data for intermittent changes.
  7. Inspect for and repair any exhaust leaks upstream of the sensor that could affect readings.
  8. If wiring and power/ground are good and heater checks are acceptable, replace the sensor with a known good unit and confirm that operation/monitoring returns to normal.
  9. After repair, clear codes and road test to confirm sensor switches properly and code does not return. Re-check freeze frame and readiness status.

Likely causes

  • Wiring or connector fault (open, short to voltage or ground, corroded pins)
  • Failed O2 sensor (stuck or electrically open)
  • Heater circuit not powered or heater element open
  • Exhaust leak or contamination preventing correct sensor response

Fault status

⚠️ Status
O2 Sensor Circuit No Activity Detected — Bank 2 Sensor 1: PCM not seeing expected upstream oxygen sensor switching; may be open, shorted, unpowered heater, contaminated sensor, wiring/connector fault, or upstream exhaust leak.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

P0134 P0155 P0156 P0135 P0420 P0174
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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