Error code

OBD2 P0104

OBD2P0104
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Mass or Volume Air Flow Circuit Intermittent.

Severity

moderateCan drive, but may experience reduced performance and fuel economy.

Summary

P0104 indicates an intermittent issue with the Mass Air Flow (MAF) sensor circuit, which measures air intake to the engine.

Symptoms

  • Check Engine Light illuminated
  • Difficulty starting
  • Poor idle quality
  • Lack of power

Common Causes

  • Contamination or blockage in MAF sensor
  • Faulty wiring or connector harnesses
  • Brittle rubber hoses and vacuum lines
  • Rodent damage to air intake system

Diagnosis

  1. Check for hard faults by unplugging the MAF sensor and inspecting connector.
  2. Clean or replace contaminated MAF sensor if necessary.
  3. Inspect vacuum lines and intake hoses for cracks or damage.

Fixes

  • Replace faulty MAF sensor

FAQ

How do I clean a contaminated MAF sensor?

Use isopropyl alcohol or electrical contact cleaner to carefully clean the sensor, avoiding scrubbing.

What should I check if my car has been stored for a long time?

Inspect air intake system and wiring harnesses for rodent damage.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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