P02F1Cylinder 4 Injector Circuit Range/Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- Needs a drive cycle to confirm a fix
- How the car detects it
- P02F1 reports an electrically implausible response of the cylinder 4 injector – not an open or short circuit (those are P0204, P0270 and P0271), but a current or voltage pattern outside the expected range. GM's 8-cylinder diesel checks the time the current takes to fall from hold to zero (outside 20–50 µs in 10 of 20 samples, two trips); GM's petrol direct injection evaluates the voltage feedback of opening and closing; Ford's diesels flag the injector's voltage or charge regulator at its limit (90 s), Ford's petrol direct injection its controlled-valve-operation adaptation at its limit. The injector may be shut off, causing misfire.
- What you may notice
- Check engine light on
- Rough running, misfire on cylinder 4
- Loss of power, smoke (diesel)
- Likely causes
- LikelyInjector electrically aged (piezo capacitance, coil resistance)
- PossibleContact resistance in the injector 4 connector or wiring
- PossibleInjector mechanically sticking (valve lift)
- RareInjector driver stage in the engine module
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.