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DTC code

P0100

Mass or Volume Air Flow Circuit Malfunction

Technical guide

Symptoms

  • Rough idle
  • poor performance
  • rich or lean running
  • check engine light
  • black smoke

Probable causes

  • MAF sensor circuit fault
  • open or short in MAF wiring
  • failed MAF sensor
  • air leak after MAF

Diagnostic steps

  1. Check MAF sensor connector and wiring.
  2. Inspect for air leaks between MAF and throttle.
  3. Clean MAF sensor.
  4. Replace MAF if faulty.
Brand-specific notes (BMW)

BMW · BMW-MS41-8 · E36/E39/E46/E53 · M52/M54/M62

Symptoms

  • Rough idle
  • poor performance
  • rich/lean running
  • check engine light

Probable causes

  • Dirty or faulty MAF sensor
  • air leak after MAF
  • wiring fault to MAF
  • contamination from oil catch can

Diagnostic steps

  1. Clean MAF sensor with MAF cleaner spray.
  2. Check for air leaks between MAF and throttle body.
  3. Test MAF sensor output voltage at idle (should be ~1.0V).
  4. Replace MAF if faulty.

Cross-checked technical synthesis (QA). It does not replace the manufacturer's procedure.

AI here is a librarian: this page shows only what mechanics confirmed, or says “unknown”. It never suggests a diagnosis — MECCANIC interprets the code, never your car.

0 confirmed cases on P0100

Nothing confirmed yet for this code. No guess is offered on purpose.

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