Error code

OBD2 P0103

OBD2P0103
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Mass or Volume Air Flow Circuit High Input.

Severity

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

Summary

P0103 indicates that the Mass Air Flow (MAF) sensor or Volume Air Flow (VAF) sensor is providing an abnormally high signal to the Engine Control Module (ECM). This issue typically affects the air intake system.

Symptoms

  • Check engine light illuminated
  • Difficulty starting
  • Poor idle quality
  • Lack of power

Common Causes

  • Wiring short to positive voltage source
  • Defective MAF sensor
  • Contamination or blockage in the MAF sensor

Diagnosis

  1. Check for hard faults by unplugging the MAF sensor and inspecting the connector.
  2. Inspect the MAF sensor for contamination or blockage.
  3. Look for vacuum leaks in intake hoses and vacuum lines.

Fixes

  • Replace the MAF sensor if it is defective or contaminated beyond cleaning.

FAQ

What should I do if my check engine light comes on with P0103?

Start by inspecting the wiring and connector of the MAF sensor for any signs of damage or contamination. If issues are found, cleaning or replacing the MAF sensor may be necessary.

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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