P0103moderate severityPowertrain
Mass Air Flow (MAF) Circuit High Input
on 2004 Subaru Legacy 3.0L H6 · AWD
What this code means
The MAF sensor signal voltage is higher than the maximum expected value.
Symptoms
- Check Engine Light
- Lean fuel condition
- Poor acceleration
- Engine surge
Common causes
- Faulty MAF sensor
- Short to voltage in signal wire
- Water damage to sensor
Diagnostic steps
- Check MAF sensor connector
- Test signal voltage
- Inspect wiring for shorts to power
- Test sensor output
Repair notes
Replace MAF sensor or repair wiring.
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