Mass Air Flow (MAF) Circuit Range/Performance
2012-2012 Subaru Legacy 3.6L H6
The 2012 Subaru Legacy is equipped with a 3.6L flat-6 engine. Below you'll find detailed p0101 diagnostic code information including labor time estimates, cost ranges, and technician notes specific to this engine configuration.
Description
The MAF sensor reading is outside the expected range for the current engine operating conditions.
Symptoms
- Check Engine Light
- Poor fuel economy
- Hesitation
- Rough idle
- Stalling
Common Causes
- Dirty MAF sensor
- Intake air leak
- Restricted air filter
- Faulty MAF sensor
- Exhaust leak near O2 sensor
Diagnostic Steps
- Compare MAF reading to spec at idle and 2500 RPM
- Check for vacuum leaks
- Inspect air filter
- Clean MAF sensor
- Check for exhaust leaks
Repair Notes
Clean or replace MAF sensor. Repair any intake leaks.
Related Codes
Other Powertrain Codes
- P0001Fuel Volume Regulator Control Circuit/Open
- P0002Fuel Volume Regulator Control Circuit Range/Performance
- P0003Fuel Volume Regulator Control Circuit Low
- P0004Fuel Volume Regulator Control Circuit High
- P0010Intake Camshaft Position Actuator Circuit/Open Bank 1
- P0011Intake Camshaft Position Timing Over-Advanced Bank 1
- P0012Intake Camshaft Position Timing Over-Retarded Bank 1
- P0013Exhaust Camshaft Position Actuator Circuit/Open Bank 1
- P0014Exhaust Camshaft Position Timing Over-Advanced Bank 1
- P0015Exhaust Camshaft Position Timing Over-Retarded Bank 1
P0101 on Other Vehicles
Common Questions
What does code P0101 mean on a 2012-2012 Subaru Legacy?
P0101 stands for "Mass Air Flow (MAF) Circuit Range/Performance". The MAF sensor reading is outside the expected range for the current engine operating conditions.
What are the symptoms of P0101 on a Subaru Legacy?
Common symptoms of P0101 include: Check Engine Light, Poor fuel economy, Hesitation, Rough idle, Stalling.
What causes P0101 on a 2012-2012 Subaru Legacy?
Common causes of P0101 include: Dirty MAF sensor, Intake air leak, Restricted air filter, Faulty MAF sensor, Exhaust leak near O2 sensor.
Last updated: March 2026