OBD2 code P0038: HO2S Heater Control Circuit High (Bank 1 Sensor 2)
The heated oxygen sensor on bank 1 is the downstream sensor 2 behind the (first) catalytic converter, used mainly to monitor the converter.
Detected Root Component
Powertrain Component
Observed Symptoms
- Check engine light on
- Usually no noticeable drivability problem
- Catalyst monitor does not complete
- Emissions test or readiness check failed
Possible Causes
- Heater control wire shorted to battery voltage, e.g. chafed harness
- Heating element shorted internally
- Water in the connector causing leakage between pins
- Output driver or software of the engine control module
Tools Required
Interactive Diagnostic
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Parts likely to be the cause (Moteur (général))
Moteur (général)
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Frequently asked questions about code P0038
What does code P0038 mean? ▾
OBD2 code P0038: HO2S Heater Control Circuit High (Bank 1 Sensor 2). The heated oxygen sensor on bank 1 is the downstream sensor 2 behind the (first) catalytic converter, used mainly to monitor the converter.
What are the symptoms of code P0038? ▾
Code P0038 may cause: Check engine light on, Usually no noticeable drivability problem, Catalyst monitor does not complete, Emissions test or readiness check failed. The intensity of these symptoms varies depending on the vehicle and driving conditions.
What causes code P0038? ▾
The most common causes of code P0038 are: Heater control wire shorted to battery voltage, e.g. chafed harness, Heating element shorted internally, Water in the connector causing leakage between pins, Output driver or software of the engine control module. A proper OBD2 diagnostic will pinpoint the exact cause.
Is it serious to drive with code P0038? ▾
Code P0038 has moderate severity (Warning). Short-term driving remains possible, but a prompt check is recommended to prevent worsening.
How do I fix code P0038? ▾
Start by reading the code with an OBD2 scanner, then follow the interactive decision tree on this page. Priority causes to check: Heater control wire shorted to battery voltage, e.g. chafed harness, Heating element shorted internally, Water in the connector causing leakage between pins, Output driver or software of the engine control module. Difficulty: Medium · Estimated time: 30-60min.