Error code P0101 is a diagnostic trouble code (DTC P0101) defined as “Mass Airflow (MAF) Circuit Operating Range or Performance Problem.”
It’s a general diagnostic trouble code and indicates performance issues with your vehicle’s mass airflow sensor (MAF sensor) — sometimes referred to as the air flow meter.
Your engine computer (the Engine Control Module or Powertrain Control Module) uses the MAF sensor to measure how much air enters your vehicle’s engine through the throttle valve. It uses this measurement to determine the correct amount of fuel to inject.
Ideally, the air-fuel ratio is 14.7:1, but this can vary depending on engine speed, intake air temperature, and intake air mass. If the amount of air entering your engine and measured by your MAF sensor is outside of the manufacturer’s specified range, the check engine light code P0101 is set.
An active P0101 trouble code won’t prevent you from driving, but it’s best to head to a professional mechanic to get it checked out ASAP to avoid doing more damage to your vehicle.
Your engine could potentially stall while driving with MAF sensor issues, which could be dangerous.
Here are some of the most common causes for check engine code P0101:
Since there are various possible causes of check engine code P0101, there isn’t a simple quick-fix solution.
With that said, here’s how a mechanic will diagnose the problem:
Once the diagnostic process is complete and your mechanic finds the root cause of your MAF sensor problem, they can begin fixing it.
Here’s how they’ll repair the different possible problems:
Here’s an estimate of how much the repair job for check engine code P0101 will cost, depending on what needs fixing:
Note: The repair costs mentioned above include labor charges.
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