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ENRUDEPLES

P0101 — Mass or Volume Air Flow Circuit Range/Performance Problem

moderate

What it means

The MAF sensor signal is electrically present but does not match the value the control module expects from engine speed, load and throttle position. Typically the measured air mass is too low or too high for the current operating point. The car may pull weakly, surge at steady speed or show unstable idle.

Likely causes (most common first)

  1. Dirty or oil-fouled MAF sensor element
  2. Air leak in the intake tract after the sensor, including cracked or loose hoses
  3. Clogged or incorrectly fitted air filter, or an aftermarket intake changing air flow
  4. Restricted exhaust or a clogged catalytic converter reducing air flow
  5. Sensor drift outside calibration, requiring replacement
  6. Leaking or stuck PCV valve or crankcase ventilation hose

Can you drive with it?

Driving is possible for a short time, but poor throttle response and higher consumption are likely; repair before long trips.

This is the generic meaning. What about your car?

The same code has different typical culprits on different engines. Tell the AI your make, model and year — it will rank the causes for your exact car and give you a check order.

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