P0263high severityPowertrain
Cylinder 1 Contribution/Balance
on 2011 Subaru Impreza 2.5L H4 · AWD
What this code means
Cylinder 1 is not contributing its expected share of power output.
Symptoms
- Check Engine Light
- Rough idle
- Misfire
- Vibration
Common causes
- Low compression cylinder 1
- Faulty injector
- Valve issue
- Head gasket leak
Diagnostic steps
- Run power balance test
- Check compression
- Test injector
- Inspect valves
Repair notes
Diagnose mechanical condition of cylinder 1.
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