P0101: Mass Air Flow (MAF) Circuit/Performance Malfunction

P0101 is a generic error code that pops up when there is an issue measuring the amount of air entering the engine. It’s usually caused by a defected, damaged or dirty MAF sensor, but there other reasons the DTC code can appear.

Related OBD-II Codes: P0100, P0102, P0103, P0104.


  • Erratic idle – engine not running at consistent RPMs.
  • Difficulty starting
  • Vehicle hesitates upon acceleration and there’s a lack of power
  • Engine stalling

How to Fix P0101 Error Code

The most common cause for the P0101 error code is a dirty or faulty mass airflow sensor. Start by pulling the MAF sensor and cleaning it.

Recommended MAF sensor cleaner: CRC Mass Air Flow Sensor Cleaner

A damaged or disconnected air intake boot (or snorkel as some call it) is another common cause for this code to show up. A visual inspection should be performed to ensure the air intake boot is still intact and connected properly.

Inspect the engine air filter to make sure it’s installed properly and not clogged. The restriction of air from a clogged filter will cause P0101.

Check for vacuum leaks.

It’s less common, but a clogged catalytic converter or restricted exhaust can also cause DTC error code P0101.

Most common fix for P0101 is to clean the MAF sensor, clear the code, and see if it comes back.

Recommended OBDII Reader: SEEKONE SK860 OBD2 Scanner