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P0100

Mass or volume air flow "A" circuit

The ECU has detected a general electrical or signal fault in the mass-air-flow sensor circuit.

What this code means

The ECU has detected a general electrical or signal fault in the mass-air-flow sensor circuit.

Possible causes

  • MAF sensor fault
  • Disconnected or damaged connector
  • Open or short circuit in wiring
  • Intake contamination or severe air-flow issue

Common symptoms

  • Check engine light
  • Poor acceleration
  • Rough idle
  • Reduced fuel economy

Checks to make

  1. Inspect the MAF connector and wiring
  2. Check the intake system for damage
  3. Review MAF live data
  4. Follow manufacturer electrical test values before replacing the sensor

Safety

  • Do not replace parts from the code alone. Confirm the fault with live data, wiring checks and manufacturer procedures. Keep clear of hot or moving engine components.

Model notes

The code definition is generic; exact diagnostic thresholds, component locations and repair procedures vary by vehicle.