P0152moderate severityPowertrain
O2 Sensor Circuit High Voltage Bank 2 Sensor 1
on 2004 Subaru Legacy 3.0L H6 · AWD
What this code means
The upstream O2 sensor voltage on Bank 2 is staying high.
Symptoms
- Check Engine Light
- Rich running Bank 2
- Black smoke
Common causes
- Faulty sensor
- Leaking injector Bank 2
- High fuel pressure
Diagnostic steps
- Monitor sensor voltage
- Check injectors
- Test fuel pressure
Repair notes
Replace sensor or fix rich condition.
Other Powertrain codes on this vehicle
P0001
Fuel Volume Regulator Control Circuit/Open
P0002
Fuel Volume Regulator Control Circuit Range/Performance
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