CarFix Answers

P0101: MAF Circuit Range/Performance

Severity: medium

What it means: The mass air flow (MAF) sensor signal is out of its expected range for the engine's operating conditions.

Safe to drive? Usually drivable, but the car may run poorly or stall. Get it checked.

Common symptoms

Likely causes, ranked

  1. Dirty or failing MAF sensor$323DIY

    CarMD 2024 national average about $323

  2. Air leak after the MAF or a loose intake bootDIY
  3. Wiring or connector faultShop
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What it means: The mass air flow (MAF) sensor signal is out of its expected range for the engine's operating conditions.

Severity: Medium. Safe to drive? Usually drivable, but the car may run poorly or stall. Get it checked.

DIY or shop?

Clean the MAF with dedicated MAF cleaner and inspect the intake boot. Both are DIY.

Before you replace parts

  1. Read all stored codes and freeze-frame data. Fix misfire, fuel or sensor codes before chasing emissions codes.
  2. Check the simple things first: connectors, vacuum hoses, fluid levels and the gas cap.
  3. Clear the code only after a repair, then confirm it stays off after a few drives.
  4. Check your VIN for recalls and service bulletins.

Safety / mechanic note

Verify with a mechanic if you notice drivability changes, warning lights or overheating. A code points to a circuit or system, not always a specific part.

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Sources