Error code

OBD2 P0102

OBD2P0102
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Mass or Volume Air Flow Circuit Low Input.

Severity

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

Summary

P0102 indicates that the Mass Air Flow (MAF) sensor is providing a signal voltage or frequency lower than expected values to the Engine Control Module (ECM). This issue can affect fuel efficiency and engine performance.

Symptoms

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

Common Causes

  • Contaminated MAF sensor due to oil or aftermarket air filter contamination
  • Brittle and cracked rubber hoses in the intake system
  • Carbon-contaminated EGR valve affecting intake airflow
  • Faulty PCV valve allowing excessive crankcase air into the intake tube
  • Corroded or damaged electrical connections

Diagnosis

  1. Check freeze frame data for RPM, vehicle speed, gear position
  2. Inspect MAF sensor connector and wiring for damage or corrosion
  3. Clean the MAF sensor with isopropyl alcohol if contaminated

Fixes

  • Replace the MAF sensor

FAQ

How do I clean a dirty MAF sensor?

Use isopropyl alcohol to carefully clean the MAF sensor, avoiding scrubbing or brushing which can damage it.

What could cause P0102 besides a faulty MAF sensor?

Other causes include contaminated air filters, cracked intake hoses, and issues with the PCV valve or EGR system.

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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