Wiring damage, chafing or high resistance in the cylinder 5 injector circuit; Corroded, loose or contaminated injector connector or control unit connector pins; Faulty cylinder 5 injector (internal coil resistance out of specification or sticking); Low or unstable battery or charging system voltage affecting injector drive; Poor earth connection affecting the injector circuit or control unit; Fault within the engine control unit injector driver; Outdated control unit software where a known fault is documented for the specific engine.

P02F2

Cylinder 5 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)
F2: FaultThe specific fault in that area

What it means

P02F2 is a generic code meaning the engine control unit has detected that the injector circuit for cylinder 5 is operating outside its expected range or performance. The control unit monitors the injector's electrical signal, such as the drive current, voltage or response, and found it did not match what it commanded. The exact monitoring method and what counts as out of range vary by engine and manufacturer.

Symptoms

Engine management light on
Rough idle or misfire on cylinder 5
Hesitation or poor acceleration
Increased fuel consumption
Hard starting or extended cranking
Engine running in a reduced power mode

Possible causes

Wiring damage, chafing or high resistance in the cylinder 5 injector circuitlikely
Corroded, loose or contaminated injector connector or control unit connector pinslikely
Faulty cylinder 5 injector (internal coil resistance out of specification or sticking)likely
Low or unstable battery or charging system voltage affecting injector drivepossible
Poor earth connection affecting the injector circuit or control unitpossible
Fault within the engine control unit injector driverrare
Outdated control unit software where a known fault is documented for the specific enginerare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting engine load, temperature and battery voltage when the fault set; check for related misfire or other injector codes
Check battery condition and charging voltage, as low voltage can upset injector circuit monitoring
Visually inspect the cylinder 5 injector wiring and connector for chafing, heat damage, corrosion, bent pins or water ingress
Check relevant fuses, relays and earth connections for the injector supply as per the manufacturer's wiring diagram
With the connector disconnected, measure the injector coil resistance and compare with the manufacturer's specification, which depends on the engine
Check the circuit for continuity, and for short to earth or to supply, between the injector connector and the control unit
Use a scan tool to run an injector test or compare cylinder 5 balance or correction values against the other cylinders
Check for any published software updates or technical bulletins for the specific engine before replacing the control unit

How to fix

Repair or replace damaged wiring and fix any high resistance or short in the cylinder 5 injector circuit
Clean, repair or replace corroded or damaged connectors and terminals
Replace the cylinder 5 injector if its resistance or operation is out of specification, following the manufacturer's procedure and any coding or adaptation requirements
Restore proper battery and charging system condition, and repair poor earth connections
Update the control unit software only where an outdated calibration is a documented cause for that engine, or repair or replace the control unit if the driver is confirmed faulty

Can I keep driving?

Medium severity

Short, gentle journeys are usually possible, but the car should be checked soon. A faulty injector can cause misfires, raw fuel in the cylinder and catalytic converter damage, so avoid heavy loads and stop driving 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.