P0136
PowertrainOxygen Sensormoderate severityO2 Sensor Circuit Bank 1 Sensor 2
What P0136 Means
General malfunction in the downstream O2 sensor circuit for Bank 1.
Symptoms
- Check Engine Light
- Failed emissions test
- Reduced catalyst monitoring
Common Causes
- Faulty downstream O2 sensor
- Wiring damage
- Exhaust leak after catalyst
Diagnostic Steps
- Test O2 sensor voltage
- Inspect wiring
- Check for exhaust leaks after cat
Where to start: Replace downstream O2 sensor.
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