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P0104

Mass or volume air flow "A" circuit intermittent

The ECU has detected an intermittent or erratic signal from the mass-air-flow sensor circuit.

What this code means

The ECU has detected an intermittent or erratic signal from the mass-air-flow sensor circuit.

Possible causes

  • Loose MAF connector
  • Intermittent wiring fault
  • Contaminated or failing sensor
  • Vibration-related connection issue

Common symptoms

  • Intermittent check engine light
  • Hesitation
  • Unstable idle
  • Occasional loss of power

Checks to make

  1. Wiggle-test accessible wiring while monitoring live data
  2. Inspect connector pins
  3. Check intake pipework
  4. Confirm MAF signal stability

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.