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Common codes
P0420P0300P0171P0455P0442P0128P0401P0113

P0101: Mass airflow sensor performance out of expected range

Drive carefully. Get it checked within a week or two.

Can I drive with P0101?

Yes, but drive carefully and get it checked soon. The air reading does not match throttle position and engine speed, causing jerky acceleration and high emissions.

What does P0101 mean?

P0101 stands for Mass or Volume Air Flow Circuit Range/Performance Problem.

Symptoms you may notice

  • Engine hesitates or jerks when stepping on the gas
  • Rough, unsteady idle at stoplights
  • Reduced engine power and delayed gear shifts

How much does it cost to fix?

Repair costs for code P0101 depend on the specific underlying root cause, ranging from simple DIY checks to component replacement. The table below lists the most common causes and rough price ranges in USD:

  • Oil or dust on MAF sensing element
    $15-$40 common
  • Cracked intake snorkel or vacuum leak
    $30-$90 common
  • Clogged engine air filter
    $15-$35 possible
  • Failing MAF sensor
    $160-$380 possible

What to do next

  1. Inspect and replace the air filter if it is heavily soiled.
  2. Clean the MAF sensor with approved electronics cleaner.
  3. Smoke-test or visually inspect the intake ducting for tears.
Last updated: October 2026

Related codes

P0100 P0102 P0171 P0174
General guidance only, not a professional diagnosis. If the check-engine light is flashing, or the car is running rough, overheating or losing power, stop driving and get help.

About this code

P0101 is triggered when the MAF sensor output deviates from calculated airflow tables stored in the ECU. Often, aftermarket oiled filters leave an oil film on the hot wire, distorting readings. Drivers usually notice an engine that hesitates when pressing the accelerator or shifts roughly on automatic transmissions. Cleaning the sensor often clears the trouble immediately without replacing expensive hardware.