What are the common causes of P02F1?

Failing coil in the cylinder 4 injector. Open or shorted wire in the cylinder 4 injector circuit. Corroded pins at the cylinder 4 injector connector. Dirty cylinder 4 injector restricting fuel. Fuel pressure or contamination affecting cylinder 4.

Compare cylinder 4 injector resistance to the other injectors. Check the cylinder 4 injector pulse with a noid light. Inspect the cylinder 4 injector connector and wiring. Check fuel pressure and fuel quality. Replace the cylinder 4 injector if it fails the electrical test. Clear the code and retest.

P02F1

Cylinder 4 Injector Circuit Range/Performance

System: Injector circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P02F1 means Cylinder 4 Injector Circuit Range/Performance.

Where it lives

For P02F1, start at the injector the description names. The description of P02F1 puts it on cylinder 4.

Check these first

Failing coil in the cylinder 4 injector
Open or shorted wire in the cylinder 4 injector circuit
Corroded pins at the cylinder 4 injector connector
Dirty cylinder 4 injector restricting fuel
Fuel pressure or contamination affecting cylinder 4

What to do next

Compare cylinder 4 injector resistance to the other injectors
Check the cylinder 4 injector pulse with a noid light
Inspect the cylinder 4 injector connector and wiring
Check fuel pressure and fuel quality
Replace the cylinder 4 injector if it fails the electrical test
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.