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Home / DTC / P1155 — Upstream heater resistance 2 fault

P1155 — Upstream heater resistance 2 fault

Detailed page for trouble code P1155.

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Code

P1155

ALFA ROMEO P — Powertrain

Upstream heater resistance 2 fault

Brand: ALFA ROMEO
Type: P — Powertrain
Views: UK: 6 EN: 14 RU: 7
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
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Code

P1155

BMW P — Powertrain

O2 Sensor Heater Circuit Intermittent Bank 2 Sensor 2

Brand: BMW
Type: P — Powertrain
Views: UK: 20 EN: 38 RU: 26
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
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Code

P1155

BUICK P — Powertrain

HO2S Lean Average Bank 2 Sensor 1

Brand: BUICK
Type: P — Powertrain
Views: UK: 21 EN: 45 RU: 28
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1155

CADILLAC P — Powertrain

HO2S Lean Average Bank 2 Sensor 1

Brand: CADILLAC
Type: P — Powertrain
Views: UK: 23 EN: 43 RU: 27
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1155

CHEVROLET P — Powertrain

HO2S Lean Average Bank 2 Sensor 1

Brand: CHEVROLET
Type: P — Powertrain
Views: UK: 19 EN: 38 RU: 27
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1155

CHRYSLER P — Powertrain

HO2S Lean Average Bank 2 Sensor 1

Brand: CHRYSLER
Type: P — Powertrain
Views: UK: 24 EN: 43 RU: 30
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1155

DAEWOO P — Powertrain

FAIL SAFE VALVE MAL

Brand: DAEWOO
Type: P — Powertrain
Views: UK: 5 EN: 13 RU: 7
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1155

FIAT P — Powertrain

Upstream heater resistance 2 fault

Brand: FIAT
Type: P — Powertrain
Views: UK: 6 EN: 14 RU: 8
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
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Code

P1155

FORD P — Powertrain

Alternative Fuel Controller

Brand: FORD
Type: P — Powertrain
Views: UK: 25 EN: 43 RU: 29
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
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Send to email
Code

P1155

GM P — Powertrain

HO2S Lean Average Bank 2 Sensor 1

Brand: GM
Type: P — Powertrain
Views: UK: 19 EN: 44 RU: 30
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
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Keep it short and practical. Up to 500 characters.
Send to email
Code

P1155

GMC P — Powertrain

HO2S Lean Average Bank 2 Sensor 1

Brand: GMC
Type: P — Powertrain
Views: UK: 21 EN: 41 RU: 28
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1155

HUMMER P — Powertrain

Heated Oxygen Sensor (HO2S) Lean Mean Bank 2 Sensor 1

Brand: HUMMER
Type: P — Powertrain
Views: UK: 10 EN: 19 RU: 13
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1155

LAND ROVER P — Powertrain

The alternative fuel control module has activated the light malfunction indicator

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 6 EN: 14 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
Workshop Manuals

Repair manuals for LAND ROVER

3

Land Rover Defender 300Tdi — Workshop Manual (1996 model year)

Workshop Manual
Defender 300Tdi Years: 1996 Manual in English 7.5 MB
Short description

Official workshop manual for the Land Rover Defender 300Tdi (from 1996 model year). Contains specifications, adjustment, fault diagnosis and step-by-step repair and overhaul procedures for engine, transmission, axles, suspension, brakes, electrical and body. Intended for dealer workshops and trained technicians.

Contents
Key sections:
  • 01 INTRODUCTION
  • 04 GENERAL SPECIFICATION DATA
  • 05 ENGINE TUNING DATA
  • 07 GENERAL FITTING REMINDERS
  • 09 LUBRICANTS, FLUIDS AND CAPACITIES
  • 10 MAINTENANCE
  • 12 ENGINE Tdi
  • - Description and operation
  • - Fault diagnosis
  • - Adjustment
  • - Repair and overhaul procedures
  • 19 FUEL SYSTEM Tdi
Download

Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)

Workshop Manual
Defender Years: 1999–2002 Manual in English 7.6 MB
Short description

Workshop Manual Supplement and Body Repair Manual for the Land Rover Defender. Includes general specifications, maintenance schedules, tuning data and step‑by‑step repair procedures for engine, transmission, suspension, brakes, electrical and body repairs. Covers Defender models from 1999 and 2002 model years.

Contents
Key sections:
  • 01 - INTRODUCTION
  • - Introduction
  • - Dimensions
  • - References
  • - Repairs and replacements
  • - Poisonous substances
  • - Fuel handling precautions
  • - Synthetic rubber
  • - Recommended sealants
  • - Used engine oil precautions
  • - Accessories and conversions
  • - Wheels and tyres
Download

Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)

Workshop Manual
Manual in English Pages: 494 7.1 MB
Short description

Land Rover Range Rover Electrical Library (LRL 0453ENG). Comprehensive manual covering fuse details, earth points, system descriptions, diagnostics and connector pin-outs for electrical troubleshooting and repair. Intended for technicians and service workshops.

Contents
Key sections:
  • 1 INTRODUCTION
  • 1.1 About this document
  • 1.2 Battery voltage
  • 1.3 Electrical precautions
  • 1.4 Battery disconnecting / charging
  • 1.5 Disciplines / greases
  • 1.6 Abbreviations
  • 1.7 HeVAC, sensors abbreviations
  • 1.8 How to use this document
  • 1.9 Connector detail format
  • 1.10 Fault diagnosis
  • 1.11 Wire colour codes
Download
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Code

P1155

LEXUS P — Powertrain

Air/Fuel Ratio Sensor Heater Circuit Malfunction Bank 1 Sensor 1

Brand: LEXUS
Type: P — Powertrain
Views: UK: 23 EN: 40 RU: 30
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1155

LINCOLN P — Powertrain

Alternative Fuel Controller

Brand: LINCOLN
Type: P — Powertrain
Views: UK: 25 EN: 40 RU: 27
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1155

MERCURY P — Powertrain

Alternative Fuel Controller

Brand: MERCURY
Type: P — Powertrain
Views: UK: 23 EN: 41 RU: 30
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
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Code

P1155

OLDSMOBILE P — Powertrain

HO2S Lean Average Bank 2 Sensor 1

Brand: OLDSMOBILE
Type: P — Powertrain
Views: UK: 23 EN: 43 RU: 34
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
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Keep it short and practical. Up to 500 characters.
Send to email
Code

P1155

Other P — Powertrain

Alternative Fuel Controller

Brand: Other
Type: P — Powertrain
Views: UK: 23 EN: 39 RU: 29
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
Workshop Manuals

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Code

P1155

SATURN P — Powertrain

HO2S Lean Average Bank 2 Sensor 1

Brand: SATURN
Type: P — Powertrain
Views: UK: 21 EN: 37 RU: 30
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1155

SCION P — Powertrain

Air-fuel ratio sensor heater circuit response malfunction

Brand: SCION
Type: P — Powertrain
Views: UK: 4 EN: 12 RU: 4
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
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Code

P1155

TOYOTA P — Powertrain

Air/Fuel Sensor Heater Circuit Bank 1 Sensor 2

Brand: TOYOTA
Type: P — Powertrain
Views: UK: 20 EN: 38 RU: 27
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1155

VOLKSWAGEN P — Powertrain

Manifold Absolute Pressure Sensor Circuit Short To B+

Brand: VOLKSWAGEN
Type: P — Powertrain
Views: UK: 20 EN: 47 RU: 40
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or high‑resistance heater element in upstream O2 sensor (Bank 2)
  • Shorted heater element to ground or to power
  • Corroded/damaged sensor connector or wiring (open or high resistance)
  • Blown fuse or failed relay supplying the heater circuit
  • Poor ground or intermittent connection
  • Excessive exhaust heat or physical damage to sensor wiring

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Longer than normal time to reach closed‑loop fuel control
  • Reduced fuel economy and possible drivability issues during cold running
  • Failed emissions test or elevated tailpipe emissions
  • Diagnostic trouble code stored for O2 heater circuit

What to check

  • Read freeze‑frame and live data with a scan tool; verify O2 heater status/commands for Bank 2 upstream sensor
  • Visually inspect the sensor, connector and harness for corrosion, burns, breaks or heat damage
  • Check for blown fuses and heater relay related to O2 sensor heater supply
  • Measure heater circuit resistance at the sensor (engine off, sensor disconnected)
  • Backprobe harness to confirm supply voltage and ground when heater is commanded ON (use safe procedures)
  • Perform continuity/resistance check from sensor connector to ECU connector to find open/high resistance or short

Signal parameters

  • Expected heater element resistance (typical): approx. 2–20 ohms (varies by sensor type — consult OEM spec)
  • Supply voltage: approx. battery voltage (12 V) available to heater when commanded ON
  • Heater current draw when ON: typically 0.5–3 A depending on sensor
  • ECU will command heater ON until sensor reaches operating temperature; scan tool shows heater status

Diagnostic algorithm

  1. Retrieve and record DTC(s), freeze frame and live data. Confirm code P1155 is current and note related codes.
  2. Visually inspect Bank 2 upstream O2 sensor, connector and wiring for damage, corrosion, heat exposure or soot.
  3. Check related fuses and relays for the heater circuit; replace if blown and investigate cause.
  4. With ignition OFF, disconnect the sensor and measure heater resistance across the heater pins. Compare to OEM spec. If open/infinite or well outside expected range, replace sensor.
  5. If resistance at sensor looks normal, check wiring continuity between sensor connector and ECU connector; repair any open/high resistance found.
  6. With a safe method (backprobing and protective measures), command heater ON via scan tool and measure voltage at the heater supply pin and ground. Verify voltage present when commanded and that current draw is within expected range.
  7. Inspect for short to ground or power in the harness if measured resistance is very low. Repair insulation or routing as required.
  8. After repairs, clear codes and perform test drive/monitoring to confirm heater reaches temperature, sensor enters closed loop and P1155 does not return.
  9. If wiring and sensor check good but fault persists, consider ECU diagnostic/repair as a last resort (verify with manufacturer guidance).

Likely causes

  • Heater element inside Bank 2 upstream O2 sensor is open or has excessive resistance
  • Connector pins corroded / wiring chafed causing high resistance or open circuit
  • Heater fuse or heater relay open
  • Wire short to ground causing apparent low resistance to ECU
  • ECU driver fault (least likely)

Fault status

⚠️ Status
Upstream O2 sensor (Bank 2) heater circuit resistance outside expected range — possible open, short or degraded heater/faulty connection.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0135 P0141 P0155 P0161 P1156
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

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