P0101
Medium SeverityMass Air Flow Sensor Circuit Range/Performance
Fuel System
What Does P0101 Mean?
The MAF sensor is reading outside the expected range for current engine conditions. Could be dirty, defective, or have an air leak after the sensor.
Common Fix
Clean MAF sensor with MAF cleaner
Estimated Cost (DIY)
$8 - $15
Symptoms
- ⚠️Rough idle
- ⚠️Hesitation on acceleration
- ⚠️Poor fuel economy
- ⚠️Black smoke from exhaust
Common Causes
Dirty MAF sensor elementlikely
Air leak after MAF sensorlikely
Faulty MAF sensorpossible
Clogged air filterpossible
How to Diagnose P0101
- 1Inspect and clean MAF sensor with MAF cleaner spray
- 2Check for vacuum leaks between MAF and throttle body
- 3Inspect air filter and intake duct
- 4Test MAF readings with scan tool at idle and 2500 RPM
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Frequently Asked Questions
- Can I clean a MAF sensor?
- Yes — use only dedicated MAF sensor cleaner spray. Never touch the sensor element. Cleaning fixes P0101 about 70% of the time.
- What happens if I ignore P0101?
- Poor fuel economy, rough running, and potential damage to the catalytic converter from incorrect fuel mixture.