P0138 code?

[utilitytristin]

Is this an oxygen sensor fault or is there something actually wrong with the car by going off freeze frame data? Also the GFM DTCs are set due to the steering wheel missing it's AUX buttons.

===PCM DTC P0138:00-AF=== Code: P0138 - O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) Status: - DTC Present at Time of Request - Malfunction Indicator Lamp is On for this DTC Module: Powertrain Control Module Freeze Frame #1: Freeze Frame #2: -EVENT_TIME: 240836520 s (Sat Sep 06 19:25:23 2036) - Event time -TOTAL_DISTANCE: 226137 km - Total Distance -FUELSYS: Closed Loop - Fuel System Status (Open/Closed Loop) -LOAD: 20.78 % - Calculated Load Value -ECT: 89 °C - Engine coolant temperature -SHRTFT1: 0.00 % - Short term fuel trim 1 -LONGFT1: 7.03 % - Long term fuel trim 1 -SHRTFT2: 3.13 % - Short term fuel trim 2 -LONGFT2: 3.91 % - Long term fuel trim 2 -RPM: 1158 1/min - Engine Revolutions Per Minute -VSS: 21.0 km/h - Vehicle Speed -SPARKADV: 13.00 ° - Spark Advance -IAT: 16 °C - Intake Air Temperature -MAF: 7.20 g/s - Mass Air Flow -RUNTM: 100 s - Time Since Engine Start -EVAP_PCT: 12.16 % - Commanded Evaporative Purge -FLI: 94.12 % - Fuel Level -FTP_H20: 0 - Fuel Tank Pressure displayed as inches of water -BARO: 96.0 kPa - Barometric pressure -VPWR: 13.92 V - Control Module Voltage -TP_REL: 3.14 % - Relative Throttle Position -TAC_PCT: 4.71 % - Commanded Throttle Actuator Control -RPMDSD: 600 1/min - Desired Idle Speed RPM -O2S12: 2.14 V - Heated Exhaust Gas Oxygen Sensor (bank 1, sensor 2) -O2S22: 0.77 V - Heated Exhaust Gas Oxygen Sensor (bank 2, sensor 2) -TQ_CNTRL: Engine Speed Desired - Torque Control Requested -APP_FLT: No Fault - Accelerator Pedal Position Sensor Status -CHT_F: No Fault - Cylinder Head Temperature Sensor Status -CHTIL: Off - Cylinder Head Temperature Indicator Lamp -ETC_TRIM_LRN: Yes - Throttle Angle Offset has Learned -IAT_F: No Fault - Inlet Air Temperature Sensor Status -MISFIRE: No - Engine Misfire currently detected -TP_F: No Fault - Throttle Position Sensor Status -FF_LRND: No - Inferred Flex Fuel Learned -MP_LRN: Yes - Misfire Profile Correction Learned -MAF_F: No Fault - Mass Air Flow Sensor Status -MAP_F: No Fault - Manifold Absolute Pressure Sensor Status -OTS_STAT: Enabled - One-Touch Start Status -SMC_MON: Off - Starter Motor Control Output Detected -STRT_RLY: Disabled - Starter Motor Relay Enable -APP1: 0.75 V - Accelerator pedal position sensor 1 -APP2: 0.38 V - Accelerator pedal position sensor 2 -TP1: 4.26 V - Throttle Position Sensor 1 -TP2: 0.92 V - Throttle Position Sensor 2 -GEAR: 3 - Gear Commanded -GEAR_OSC: 3 - Gear Command by Output State Control -TSS_SRC: 1090 1/min - Actual Turbine Shaft Speed -OSS_SRC: 591 1/min - Actual Output Shaft Speed -TFT: 83 °C - Transmission Fluid Temperature -TR: Drive/OverDrive - Transmission range ===END PCM DTC P0138:00-AF=== ===OBDII DTC P0138-C=== Code: P0138 - O2 Sensor Circuit High Voltage (Bank 1 Sensor 2) Status: - Confirmed - malfunction is confirmed Module: On Board Diagnostic II ===END OBDII DTC P0138-C=== ===GFM DTC B1457:15-0A=== Code: B1457 - Auxiliary Switch 1 Additional Fault Symptom: - Circuit Short To Battery Or Open Status: - DTC Present at Time of Request - Malfunction Indicator Lamp is Off for this DTC Module: Generic Function Module ===END GFM DTC B1457:15-0A=== ===GFM DTC B1459:15-0A=== Code: B1459 - Auxiliary Switch 3 Additional Fault Symptom: - Circuit Short To Battery Or Open Status: - DTC Present at Time of Request - Malfunction Indicator Lamp is Off for this DTC Module: Generic Function Module ===END GFM DTC B1459:15-0A===

 

[ProjectSHO89]

The FF data posted indicates that the voltage from B1S2 is too high. Under normal operation, the downstream sensors should read between 0 and 1 volt. Yours indicates that there is a partial short to voltage.

It's probably a bad B1S2 sensor but it could also be a wiring fault or PCM issue.

Inspect the connector and wiring harness for B1S2 and correct anything found. If you wish, you can swap the two downstream sensors to see if the fault moves to the other side or not. If it moves, the sensor is faulty.

 

[utilitytristin]

The FF data posted indicates that the voltage from B1S2 is too high. Under normal operation, the downstream sensors should read between 0 and 1 volt. Yours indicates that there is a partial short to voltage.

It's probably a bad B1S2 sensor but it could also be a wiring fault or PCM issue.

Inspect the connector and wiring harness for B1S2 and correct anything found. If you wish, you can swap the two downstream sensors to see if the fault moves to the other side or not. If it moves, the sensor is faulty.

The check engine light comes on intermittently for that code. I'll get to swap them later today and see if that code moves.

 

[peterk9]

There are some existing threads on that fault that I found using the Search feature. Here is one of them; P0138 - O2 Sensor Bank 1 Sensor 2
Another reported that the issue was chaffed wires on the rear 02 sensor.
I don't know if there is anything there to help.

Peter