P0136moderate severityPowertrain
O2 Sensor Circuit Bank 1 Sensor 2
on 2004 Subaru Legacy 3.0L H6 · AWD
What this code 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
Repair notes
Replace downstream O2 sensor.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
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P0003
Fuel Volume Regulator Control Circuit Low
P0004
Fuel Volume Regulator Control Circuit High
P0010
Intake Camshaft Position Actuator Circuit/Open Bank 1
P0011
Intake Camshaft Position Timing Over-Advanced Bank 1
P0012
Intake Camshaft Position Timing Over-Retarded Bank 1
P0013
Exhaust Camshaft Position Actuator Circuit/Open Bank 1
P0014
Exhaust Camshaft Position Timing Over-Advanced Bank 1
P0015
Exhaust Camshaft Position Timing Over-Retarded Bank 1