OBD II Fault Code

  • OBD II P029F

OBD-II Code Decreased engine performance is defined as a Cylinder 2 - Fuel Trim at Min Limit

The engine control module (PCM) uses multiple sensors to determine the required amount of fuel needed to keep the engine running efficiently. If the PCM cannot achieve the desired balance between fuel and air, it will set code P029F.

Decreased engine performance Symptoms

  • Decreased engine performance
  • Increased fuel consumption

Common Problems That Trigger the P029F Code

  • Clogged air filter
  • Damaged or contaminated spark plug
  • Engine sensor failure
  • Exhaust leak
  • Fuel injector failure
  • Internal engine failure
  • Powertrain Control Module (PCM) software needs to be updated
  • The fuel does not meet the manufacturer's requirements

Common Repairs Needed for the P029F Code

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