P0101 Code: Mass or Volume Air Flow (MAF) Sensor Circuit Range/Performance
🟠 Moderate severity · drivable
Drivable short-term, but a wrong air reading can cause rough running and poor fuel economy, so fix it soon.
What P0101 means
The mass air flow (MAF) sensor is reporting an airflow reading that's outside the expected range for the current engine conditions. The MAF tells the computer how much air is entering so it can add the right amount of fuel; a bad reading throws that calculation off.
Symptoms
- Check engine light is on
- Poor acceleration or hesitation
- Rough or unstable idle
- Stalling
- Poor fuel economy
Common causes
- most common: Dirty or contaminated MAF sensor
- common: Vacuum leak after the MAF sensor
- common: Faulty MAF sensor
- less common: Clogged air filter
- less common: Wiring or connector problem at the MAF sensor
How to fix it
| Fix | DIY? | Typical cost |
|---|---|---|
| Clean the MAF sensor with MAF cleaner spray | Yes | $10–20 |
| Replace a clogged air filter | Yes | $10–30 |
| Repair any vacuum leaks | Yes | $10–100 |
| Replace a faulty MAF sensor | Yes | $80–300 |
Frequently asked questions
Can I drive with a P0101 code?
Usually yes for a short time, but the engine may run poorly. Get it fixed soon to restore fuel economy and drivability.
Can I just clean the MAF sensor?
Often yes — a dirty MAF is the most common cause. Use a dedicated MAF cleaner spray, never carb cleaner, and don't touch the delicate wire.
How much does it cost to fix a P0101?
Cleaning is $10–$20. A new MAF sensor runs $80–$300 depending on the vehicle.
Related codes
P0102
P0102 Code: Mass Air Flow Sensor Circuit Low
P0113P0113 Code: Intake Air Temperature (IAT) Sensor Circuit High Input
P0171P0171 Code: System Too Lean (Bank 1)
Updated 2026-08. This page is informational and not a substitute for professional diagnosis.