What causes fault code P02F5?

• Most likely: Clogged or partially failing fuel injector on cylinder 6 • Likely: High resistance or corrosion in the injector connector • Possible: Mechanical engine issues (low compression, worn rings or valves) in cylinder 6 • Rare: Wiring harness issues (short to ground or open circuit) between ECU and injector

Powertrain (Engine & Gearbox)Standard EOBD

P02F5 - Cylinder 6 Injector - Contribution/Balance Fault

Q: What are the symptoms of fault code P02F5?

• Check engine light (MIL) illuminated • Rough or erratic idling • Reduced engine power and poor acceleration • Increased fuel consumption • Engine hesitation or jerking under load

Q: How do you fix fault code P02F5?

STEP 1: Inspect the fuel injector connector for cylinder 6 for corrosion or loose pins. Clean with contact cleaner if necessary. STEP 2: Use a multimeter to measure the injector's internal resistance. Standard electromagnetic injectors usually measure between 12-16 Ohms (check manufacturer specs). Replace if resistance is out of range. STEP 3: Perform an injector balance test or monitor 'smooth running' live data using a scan tool to confirm the deviation under operation. STEP 4: If electrical values are fine, perform a compression or leak-down test on cylinder 6 to rule out mechanical internal engine damage. STEP 5: If fuel flow is restricted, replace the fuel injector. Ensure new injector coding (IMA/ISA codes) is performed in the ECU if applicable.

Last updated:1 February 2026

Related:Fuel Injector, Engine Control Unit (ECU), Crankshaft Position Sensor (CKP), Kablage och kontaktstycken

System

Powertrain (Engine & Gearbox)

Related Fault Codes

P0200

Injector Circuit Malfunction

P0201

Cylinder 1 Injector Circuit Open

P0202

Injector Circuit - Cylinder 2 - Malfunction

P0203

Injector Circuit - Cylinder 3

Technical Description

P02F5 is set when the Engine Control Unit (ECU) detects that cylinder 6 is not contributing the expected amount of power/torque to the crankshaft compared to the other cylinders. The ECU monitors the crankshaft speed (acceleration) following the firing stroke of cylinder 6 using the Crankshaft Position (CKP) sensor. If the measured acceleration is below a calibrated threshold, the ECU identifies a contribution or balance fault. This can be caused by restricted fuel flow, electrical resistance issues in the injector coil, or internal mechanical wear.

Possible Causes

Clogged or partially failing fuel injector on cylinder 6

High resistance or corrosion in the injector connector

Mechanical engine issues (low compression, worn rings or valves) in cylinder 6

Wiring harness issues (short to ground or open circuit) between ECU and injector

Symptoms

Check engine light (MIL) illuminated

Rough or erratic idling

Reduced engine power and poor acceleration

Increased fuel consumption

Engine hesitation or jerking under load

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P02F5 - Cylinder 6 Injector - Contribution/Balance Fault

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P02F5 - Cylinder 6 Injector - Contribution/Balance Fault

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