Powertrain, generic · Fuel and air metering (injector circuit)

P02F4 Cylinder 7 Injector Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P02F4 reports an electrically implausible response of the cylinder 7 injector – not an open or short circuit (those are P0207, P0279 and P0280), 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.

Likely causes

Injector electrically aged (piezo capacitance, coil resistance)
Contact resistance in the injector 7 connector or wiring
Injector mechanically sticking (valve lift)
Injector driver stage in the engine module

Symptoms

  • Check engine light on
  • Rough running, misfire on cylinder 7
  • Loss of power, smoke (diesel)

Repair estimate

DifficultyHardWorkshop job
Parts and labour€100–900
Time1–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

fuel injector cylinder 7injector wiringengine control module

Related codes

P0207P0279P0280P0281P02F5P0307

References: fordservicecontent.com, gsi.ext.gm.com, gsi.ext.gm.com, fordservicecontent.com.