Code
P1137
BMW
P — Powertrain
O2 Sensor Heater Circuit Signal Intermittent Bank 1 Sensor 2
Views:
UK: 23
EN: 41
RU: 30
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
BUICK
P — Powertrain
HO2S Bank 1 Sensor 2 Lean Or Low Voltage
Views:
UK: 22
EN: 39
RU: 29
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
CADILLAC
P — Powertrain
HO2S Bank 1 Sensor 2 Lean Or Low Voltage
Views:
UK: 21
EN: 38
RU: 29
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
CHEVROLET
P — Powertrain
HO2S Bank 1 Sensor 2 Lean Or Low Voltage
Views:
UK: 21
EN: 40
RU: 31
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
CHRYSLER
P — Powertrain
HO2S Bank 1 Sensor 2 Lean Or Low Voltage
Views:
UK: 25
EN: 43
RU: 30
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
FORD
P — Powertrain
Lack of Downstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1
Views:
UK: 21
EN: 39
RU: 30
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
GM
P — Powertrain
HO2S Bank 1 Sensor 2 Lean Or Low Voltage
Views:
UK: 24
EN: 44
RU: 33
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
GMC
P — Powertrain
HO2S Bank 1 Sensor 2 Lean Or Low Voltage
Views:
UK: 20
EN: 39
RU: 29
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
HUMMER
P — Powertrain
Heated Oxygen Sensor (HO2S) Bank 1 Sensor 2 Lean System or Low Voltage
Views:
UK: 10
EN: 14
RU: 17
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
JAGUAR
P — Powertrain
Lack Of HO2S12 Switches Sensor Indicates Lean
Views:
UK: 23
EN: 43
RU: 36
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
LAND ROVER
P — Powertrain
Lack of key H02S-12, the sensor indicates tilt
Views:
UK: 8
EN: 11
RU: 13
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Workshop ManualYour experience will help others
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Code
P1137
LINCOLN
P — Powertrain
Lack of Downstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1
Views:
UK: 18
EN: 36
RU: 26
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
MAZDA
P — Powertrain
HO2S Bank 1 Sensor 2 Not Switching Fuel Control Limit Reached
Views:
UK: 25
EN: 39
RU: 32
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
MERCURY
P — Powertrain
Lack of Downstream Heated Oxygen Sensor Switch Sensor Indicates Lean Bank 1
Views:
UK: 20
EN: 40
RU: 28
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
OLDSMOBILE
P — Powertrain
HO2S Bank 1 Sensor 2 Lean Or Low Voltage
Views:
UK: 25
EN: 43
RU: 35
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
Other
P — Powertrain
Lack Of HO2S Switch - Sensor Indicates Lean
Views:
UK: 26
EN: 43
RU: 31
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
RAM
P — Powertrain
O2 Sensor Heater 1/3 Element Resistance Out of Range
Views:
UK: 2
EN: 4
RU: 6
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
SAAB
P — Powertrain
Additive Adaptation Bank 1 Max Value Air/Fuel Mixture Too Lean
Views:
UK: 2
EN: 4
RU: 7
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
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Code
P1137
SATURN
P — Powertrain
HO2S Bank 1 Sensor 2 Lean Or Low Voltage
Views:
UK: 18
EN: 37
RU: 26
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
Your experience will help others
+100 karma for a short comment :)
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Code
P1137
SUBARU
P — Powertrain
Front Oxygen AF Sensor Circuit Range Performance Problem
Views:
UK: 21
EN: 43
RU: 27
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
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Send to email
Code
P1137
VOLKSWAGEN
P — Powertrain
Long Term Fuel Trim Add Fuel Bank 1 System Too Rich
Views:
UK: 20
EN: 45
RU: 29
AI status
Completed
Completed
100%
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
- Connect a professional scan tool, read all codes and freeze frame; note when P1137 occurred (temp, RPM, load).
- Visually inspect Bank 1 Sensor 2 connector and wiring for corrosion, heat damage, water intrusion, broken strands, or pin/backing deformation.
- Perform a wiggle test of harness/connectors while monitoring live heater status/current with the scan tool or DVOM to reproduce intermittent behavior.
- Check related fuses and relays for the heater circuit; wiggle fuse box/terminals and re-test if intermittent.
- Measure heater element resistance at the sensor connector (unplug sensor). Compare to spec. An open or wildly out-of-range value requires sensor replacement.
- 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.
- If supply voltage is intermittent at connector but present at fuse/relay, trace wiring for chafes or shorts; repair/replace harness sections as needed.
- If wiring and supply are good but heater element intermittently opens or resistance varies, replace the O2 sensor (Bank 1 Sensor 2).
- 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.
- 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
Your experience will help others
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Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
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0
Send to email