Fuel and air

P02F2 — Cylinder 5 Injector Circuit Range/Performance

Severity: medium Drive with care, to a shop

What P02F2 means

The engine control module drives the cylinder 5 injector with an electrical pulse and monitors the circuit. P02F2 sets when the circuit values or the injector's response fall outside the expected range. The cause is usually the injector itself or its wiring and connector, and only rarely the driver inside the control module.

Symptoms

  • Check Engine light on
  • Rough idle
  • Hesitation or loss of power
  • Worse fuel economy
  • Misfire or engine vibration
  • Raw fuel smell from the exhaust

Possible causes

  1. Faulty or sticking cylinder 5 fuel injector
  2. Damaged wiring or corroded injector connector
  3. Open or short circuit between the injector and the PCM
  4. Incorrect fuel pressure
  5. Air leak skewing the air-fuel mixture
  6. Failed PCM (rare)

How to diagnose

  1. Read codes and freeze frame data and look for cylinder 5 misfire codes
  2. Check fuel trim and adaptation values
  3. Inspect the cylinder 5 injector connector and harness for corrosion, chafing or heat damage
  4. Measure injector coil resistance and compare it with other injectors and the spec
  5. Check for power and a driving pulse at the injector with a noid light or scope
  6. Test the wires back to the PCM for opens and shorts to ground or voltage
  7. Check fuel pressure and look for intake leaks
  8. Swap the injector with another cylinder to see whether the fault follows it

Common fixes

  • Repair the wiring or replace the injector connector
  • Replace the cylinder 5 fuel injector
  • Clean or bench-test injectors if they are clogged
  • Fix any air leak or fuel pressure problem
  • Reflash or replace the PCM only after ruling out everything else

Questions and answers

What does P02F2 mean?

The PCM found that the cylinder 5 injector circuit is operating outside its expected range. The injector or its wiring is the most common cause.

Can I drive with P02F2?

Only briefly and carefully, to get to a shop. Extended driving with a bad injector can damage the catalytic converter and the engine.

How can I tell if it's the injector or the wiring?

Check the injector's resistance and inspect the connector, then swap the injector with a neighboring cylinder. If the code moves to that cylinder, the injector is bad.

This is general information about the code. The meaning can differ between makes and models: a scan tool and the repair manual for your car will show the exact cause.