Faulty cylinder 10 fuel injector (internal electrical fault or sticking); Damaged, chafed or corroded wiring to the cylinder 10 injector; Poor connection at the injector connector or control unit connector (loose, corroded, bent or spread pins); High resistance or intermittent fault in the injector supply or earth circuit; Fault in the injector driver within the engine control unit; Low or unstable system voltage affecting injector operation; Outdated or faulty control unit software where a manufacturer bulletin identifies it as a known cause.

P02F7

Cylinder 10 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)
F7: FaultThe specific fault in that area

What it means

P02F7 is a generic code meaning the engine control unit has detected that the cylinder 10 fuel injector circuit is operating outside its expected range or performance. The control unit monitors the injector driver and circuit, and it set this code because the electrical signal or response did not match what it expected. This points to a fault in the injector, its wiring or the driver, rather than a confirmed mechanical fault. The exact monitoring method varies by engine and manufacturer.

Symptoms

Engine management warning light on
Rough running or misfire, mainly on one cylinder
Hesitation or poor power under load
Rough idle or uneven idle
Hard starting or extended cranking
Higher than normal fuel consumption

Possible causes

Faulty cylinder 10 fuel injector (internal electrical fault or sticking)likely
Damaged, chafed or corroded wiring to the cylinder 10 injectorlikely
Poor connection at the injector connector or control unit connector (loose, corroded, bent or spread pins)likely
High resistance or intermittent fault in the injector supply or earth circuitpossible
Fault in the injector driver within the engine control unitrare
Low or unstable system voltage affecting injector operationpossible
Outdated or faulty control unit software where a manufacturer bulletin identifies it as a known causerare

How to diagnose

Confirm the engine actually has at least 10 cylinders and note any other injector or misfire codes stored.
Read the freeze frame data and note engine speed, load, temperature and battery voltage when the code set.
Check battery condition and charging voltage, as low voltage can upset injector circuit monitoring.
Visually inspect the cylinder 10 injector connector and wiring for chafing, heat damage, corrosion, oil contamination and loose pins.
Wiggle test the harness and connector with the engine running and watch for changes in idle quality or live data.
Measure injector coil resistance and compare with the manufacturer specification for that engine.
Check the supply, earth and control circuits between the injector and the control unit for continuity, short circuits and high resistance.
Use a scan tool to check injector activation or balance tests, and compare cylinder 10 with other cylinders; follow the model-specific procedure.

How to fix

Repair or replace damaged wiring to the cylinder 10 injector, using proper soldered or crimped repairs with sealing.
Clean, repair or replace corroded or damaged connectors and terminals.
Replace the cylinder 10 injector if its resistance or operation is out of specification, following the engine-specific procedure and any coding requirements.
Correct charging system or battery faults that cause low or unstable voltage.
Update the control unit software only if a manufacturer bulletin identifies it as a cause, and replace the control unit only after wiring and injector faults are ruled out.

Can I keep driving?

Medium severity

The car can usually be driven a short distance to get it checked, but a faulty injector can cause misfires and unburnt fuel, which may harm the catalytic converter and affect engine reliability. Avoid heavy loads and long journeys, and stop if the engine runs very roughly or the warning light flashes.

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