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P0101: Mass Air Flow (MAF) Circuit Range/Performance
The MAF sensor is reading values outside the expected range.
Medium Severity
$10 – $500
Can I Keep Driving with Code P0101?
Yes, but expect poor fuel economy, rough running, and possibly stalling.
What P0101 Means
The mass air flow sensor measures how much air enters the engine. P0101 means its readings do not match what the computer expects for current conditions. Usually caused by a dirty sensor, vacuum leak, or intake restriction.
Common Causes
- Dirty or contaminated MAF sensor — see repair cost
- Vacuum or intake leak after the MAF
- Clogged engine air filter — see repair cost
- Failed MAF sensor — see repair cost
Diagnostic Tips
- Try MAF cleaner spray first, it fixes this code about half the time and costs $10.
- Replace the air filter if it has not been done in 20,000+ miles.
- Smoke test the intake for vacuum leaks before replacing the sensor.
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Get My Free EstimateFrequently Asked Questions
Will MAF cleaner really fix P0101?
Often yes. Use only MAF-safe cleaner, not carb or brake cleaner, which can damage the sensor wire.