P029A OBD II Trouble Code Cylinder 1 Fuel Trim at Max Limit

How to quickly diagnose, repair, and info on symptoms and causes of a P029A code that indicates the fuel trim is at it's maximum limit on cylinder number 1.

Symptoms of P029A OBD II Trouble Code

  • Diminished engine performance
  • Delayed engine startup
  • The presence of stored lean exhaust codes
  • Misfire codes may also be stored

Common Causes of P029A OBD II Trouble Code

  • Defective/leaking fuel injector
  • Bad fuel pump
  • Engine vacuum leak (including EGR valve failure)
  • Faulty oxygen sensor
  • Mass air flow (MAF) or Manifold Air Pressure (MAP) sensor failure

Severity of P029A OBD II Trouble Code

The P029A should be classified as severe because a lean fuel condition may result in catastrophic engine damage.