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P0102

Mass or volume air flow "A" circuit low

The ECU is receiving a mass-air-flow sensor signal lower than the expected electrical range.

What this code means

The ECU is receiving a mass-air-flow sensor signal lower than the expected electrical range.

Possible causes

  • Disconnected MAF sensor
  • Open or short-to-ground wiring
  • Contaminated or failed MAF sensor
  • Restricted intake

Common symptoms

  • Check engine light
  • Poor throttle response
  • Rough idle or stalling
  • Reduced power

Checks to make

  1. Inspect connector and wiring
  2. Check air filter and intake pipework
  3. Review MAF live data
  4. Test sensor supply and signal according to vehicle data

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.