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Home / DTC / P1137 — O2 Sensor Heater Circuit Signal Intermittent Bank 1 Sensor 2

P1137 — O2 Sensor Heater Circuit Signal Intermittent Bank 1 Sensor 2

Detailed page for trouble code P1137.

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Code

P1137

BMW P — Powertrain

O2 Sensor Heater Circuit Signal Intermittent Bank 1 Sensor 2

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
Repair manuals

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Code

P1137

BUICK P — Powertrain

HO2S Bank 1 Sensor 2 Lean Or Low Voltage

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
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Code

P1137

CADILLAC P — Powertrain

HO2S Bank 1 Sensor 2 Lean Or Low Voltage

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
206

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Code

P1137

CHEVROLET P — Powertrain

HO2S Bank 1 Sensor 2 Lean Or Low Voltage

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
456

Browse 456 CHEVROLET manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

CHEVROLET

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

P1137

CHRYSLER P — Powertrain

HO2S Bank 1 Sensor 2 Lean Or Low Voltage

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
193

Browse 193 CHRYSLER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

CHRYSLER

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

P1137

FORD P — Powertrain

Lack of Downstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1137

GM P — Powertrain

HO2S Bank 1 Sensor 2 Lean Or Low Voltage

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1137

GMC P — Powertrain

HO2S Bank 1 Sensor 2 Lean Or Low Voltage

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
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Code

P1137

HUMMER P — Powertrain

Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 Lean System or Low Voltage

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
Repair manuals

Manual library for HUMMER

138

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Code

P1137

JAGUAR P — Powertrain

Lack Of HO2S12 Switches Sensor Indicates Lean

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
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Code

P1137

LAND ROVER P — Powertrain

Lack of key H02S-12, the sensor indicates tilt

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
320

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LAND ROVER

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Code

P1137

LINCOLN P — Powertrain

Lack of Downstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
166

Browse 166 LINCOLN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LINCOLN

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Code

P1137

MAZDA P — Powertrain

HO2S Bank 1 Sensor 2 Not Switching Fuel Control Limit Reached

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1137

MERCURY P — Powertrain

Lack of Downstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
296

Browse 296 MERCURY manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MERCURY

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Code

P1137

OLDSMOBILE P — Powertrain

HO2S Bank 1 Sensor 2 Lean Or Low Voltage

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
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Code

P1137

Other P — Powertrain

Lack Of HO2S Switch - Sensor Indicates Lean

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
9,452

The library contains 9,452 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

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626
VOLVO
221
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Code

P1137

RAM P — Powertrain

O2 Sensor Heater 1/3 Element Resistance Out of Range

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
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Code

P1137

SAAB P — Powertrain

Additive Adaptation Bank 1 Max Value Air/Fuel Mixture Too Lean

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
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Code

P1137

SATURN P — Powertrain

HO2S Bank 1 Sensor 2 Lean Or Low Voltage

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1137

SUBARU P — Powertrain

Front Oxygen AF Sensor Circuit Range Performance Problem

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P1137

VOLKSWAGEN P — Powertrain

Long Term Fuel Trim Add Fuel Bank 1 System Too Rich

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

Causes

  • Intermittent open or short in heater wiring or connector
  • Corroded / loose sensor connector or pins
  • Failed O2 sensor heater element (intermittent internal connection)
  • Blown fuse or faulty relay supplying heater circuit
  • Poor ground or high-resistance ground point
  • Intermittent ECU / heater driver fault or software issue

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Possible failed catalyst readiness or emissions test failure
  • Longer-than-normal warm-up for closed-loop operation (emissions impact)
  • Occasional rough idle or hesitation (less common for downstream sensor)
  • Intermittent or stored freeze-frame data showing heater supply anomalies

What to check

  • Retrieve freeze frame and freeze-frame data, note conditions when code set
  • Scan for related codes (ECU, CAN, other O2 sensor codes)
  • Visual inspection: sensor connector, wiring along exhaust, heat/chafe points
  • Wiggle test connector and harness while monitoring live data or status
  • Check fuses and relays associated with O2 heater circuit
  • Back-probe heater supply and ground while monitoring with a multimeter or oscilloscope

Signal parameters

  • Heater element resistance (typical): approx. 2 - 30 ohms (manufacturer-specific — consult BMW spec)
  • Heater supply voltage: ~11–14 V when commanded ON (depending on system and relay)
  • Heater current draw: often in the 0.5–4 A range (varies by sensor type)
  • Ground continuity to chassis: near 0 ohms (low resistance)
  • Intermittent/rapid changes or open circuit readings indicate fault

Diagnostic algorithm

  1. Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
  2. Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
  3. Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
  4. Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
  5. Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
  6. Back-probe the harness with engine running/cold-start as required and command heater ON (if possible) to verify supply voltage and pulsed control from ECU. Verify ground continuity to chassis.
  7. If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
  8. If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
  9. If heater supply and sensor check OK but intermittent signal persists, suspect ECU/driver or intermittent connector pins — test harness continuity to ECU and consider ECU diagnostics or replacement only after wiring and sensor are confirmed good.
  10. Clear codes, perform a road test and verify code does not return and heater function/monitoring returns to normal.

Likely causes

  • Faulty/deteriorating Bank 1 Sensor 2 oxygen sensor heater
  • Damaged/corroded sensor connector or wiring harness at sensor
  • Intermittent open/short in heater power feed or ground
  • Blown fuse or poor fuse contact in heater supply circuit
  • Intermittent ECU heater driver or internal connector fault

Fault status

⚠️ Status
Intermittent heater circuit signal detected for O2 sensor Bank 1 Sensor 2 — heater supply or circuit is unstable or intermittent.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0141 P0137 P0138 P0157 P0158
626

Browse 626 VOLKSWAGEN manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

VOLKSWAGEN

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