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P0103

Mass or volume air flow "A" circuit high

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

What this code means

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

Possible causes

  • Short to voltage in MAF wiring
  • Failed MAF sensor
  • Connector fault
  • Incorrect sensor supply or ground

Common symptoms

  • Check engine light
  • Poor running or hesitation
  • Abnormal fuel trim

Checks to make

  1. Inspect MAF wiring and connector
  2. Check sensor supply, ground and signal
  3. Review live MAF readings
  4. Check for related intake or sensor codes

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.