P0041moderate severityPowertrain
O2 Sensor Signals Swapped Bank 1 Sensor 2 / Bank 2 Sensor 2
on 2009 Subaru Forester 2.5L H4 · AWD
What this code means
The downstream O2 sensor signals for Bank 1 and Bank 2 appear to be swapped.
Symptoms
- Check Engine Light
- Incorrect catalyst monitoring
- Failed emissions
Common causes
- Sensor connectors swapped
- Wiring crossed after service
Diagnostic steps
- Verify downstream sensor connections
- Trace wiring to PCM
Repair notes
Correct the sensor connector routing.
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