P02F9Cylinder 12 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
- P02F9 reports an electrically implausible response of the cylinder 12 injector – not an open or short circuit (those are P0212, P0294 and P0295), but a current or voltage pattern outside the expected range. Cylinder 12 exists only on engines with twelve or more cylinders; GM and Ford documents stop at cylinder 8, so the description follows CARB and the documented checks for cylinders 1–8 (current fall time, voltage feedback, regulator at its limit). The injector may be shut off, causing misfire.
- What you may notice
- Check engine light on
- Rough running, misfire on cylinder 12
- Loss of power, smoke (diesel)
- Likely causes
- LikelyInjector electrically aged (piezo capacitance, coil resistance)
- PossibleContact resistance in the injector 12 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.