P0101
Mass Air Flow (MAF) Circuit Range/Performance
2001-2003 BMW 525i E39 2.5L I6 🇨🇦
Moderate SeverityPowertrain
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 2001-2003 BMW 525i E39?
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 BMW 525i E39?
Common symptoms of P0101 include: Check Engine Light, Poor fuel economy, Hesitation, Rough idle, Stalling.
What causes P0101 on a 2001-2003 BMW 525i E39?
Common causes of P0101 include: Dirty MAF sensor, Intake air leak, Restricted air filter, Faulty MAF sensor, Exhaust leak near O2 sensor.