Wiring or connector fault in the cylinder 11 injector circuit, such as high resistance, corrosion or chafing; Faulty cylinder 11 injector, with internal resistance or inductance out of specification; Poor earth or low supply voltage affecting the injector circuit; Mechanical injector fault such as sticking or restricted operation causing an abnormal electrical response; Injector driver fault inside the engine control unit; Outdated or faulty control unit software, where the manufacturer has identified it as a known cause for the engine concerned.

P02F8

Cylinder 11 Injector Circuit Range/Performance.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
2: AreaFuel and air metering (injector circuit)
F8: FaultThe specific fault in that area

What it means

P02F8 is the generic code for a range or performance fault in the cylinder 11 fuel injector circuit. The engine control unit monitors the injector circuit's electrical behaviour, and it has seen a signal or response from the cylinder 11 injector that falls outside the expected range, without it being a plain open or short circuit. Only engines with 11 or more cylinders use this code, so it is rare and the exact cylinder numbering depends on the engine.

Symptoms

Malfunction indicator lamp on
Rough running or misfire, especially at idle
Loss of power or poor acceleration
Increased fuel consumption
Hesitation or uneven running under load
Engine may enter a reduced power mode

Possible causes

Wiring or connector fault in the cylinder 11 injector circuit, such as high resistance, corrosion or chafinglikely
Faulty cylinder 11 injector, with internal resistance or inductance out of specificationlikely
Poor earth or low supply voltage affecting the injector circuitpossible
Mechanical injector fault such as sticking or restricted operation causing an abnormal electrical responsepossible
Injector driver fault inside the engine control unitrare
Outdated or faulty control unit software, where the manufacturer has identified it as a known cause for the engine concernedrare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting engine load, speed, temperature and battery voltage when the fault set
Check for other injector, misfire or fuel system codes, as they help show whether the fault is isolated to cylinder 11
Confirm which physical cylinder is number 11 using the manufacturer's firing order and cylinder layout for that engine
Visually inspect the injector connector, wiring and harness routing for damage, heat, chafing, water ingress or corrosion
Check battery condition, charging voltage and the relevant earth and supply connections
Measure injector coil resistance and compare it with the manufacturer's specification, and check the wiring resistance back to the control unit
Use live data or an actuator test to see how cylinder 11 behaves compared with the other cylinders
Check for any applicable manufacturer service bulletins or software updates for the engine

How to fix

Repair or replace damaged wiring, and clean or replace corroded or loose connectors in the cylinder 11 injector circuit
Replace the cylinder 11 injector if its electrical values or operation are out of specification, and carry out any required coding or adaptation
Repair poor earths or supply faults and correct any battery or charging problems
Replace a sticking or restricted injector after confirming the fault, following the manufacturer's procedure
Replace or repair the engine control unit only after the wiring and injector are proven good
Apply a manufacturer software update where an applicable one exists for the fault

Can I keep driving?

Medium severity

The car can usually be driven a short distance to a workshop, but get it checked soon. Continued misfiring or poor injector operation may overheat the catalytic converter or cause engine damage, so avoid heavy loads and stop if it runs very roughly.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.