P02F9 OBD II Trouble Code Cylinder #12 Injector Circuit Range/Performance

How to quickly diagnose, repair, and info on symptoms and causes of a P02F9 code that indicates there is an out of range or performance problem with the cylinder number 12 fuel injector circuit.

Symptoms of P02F9 OBD II Trouble Code

  • The check engine light will illuminate and code P02F9 will set
  • The engine will run rougher than normal
  • A lack of power
  • A big drop in fuel economy may result

Common Causes of P02F9 OBD II Trouble Code

  • Dirty fuel injector supplying the number two cylinder
  • Faulty fuel injector
  • Plugged fuel injector
  • Open or short in the fuel injector wiring harness
  • Faulty electrical harness from the PCM to the injector
  • Faulty electrical connector on the fuel injector
  • Loose or corroded fuel injector connector