P02F3: Cylinder 6 Injector Circuit Range/Performance

What it means

The cylinder 6 injector drive circuit is electrically OK but the response (current ramp, dwell time, or peak voltage) does not match the calibrated profile — typically a high-resistance solenoid winding or wiring corrosion.

At a glance

• Usually lights the check-engine light
• Affects emissions; the car can fail an emissions test

How it works

The engine control module switches the fuel injector assigned to cylinder 6 and monitors the electrical response of its driver circuit. This code sets when the circuit is present but the injector's current or voltage response falls outside the expected range, which can point to a weak injector winding or resistance in its connector or wiring.

Common causes

Most likely first.

1. Injector fault
2. Injector connector or wiring fault

Symptoms

• Check engine light on
• Rough idle or engine misfire
• Hesitation or reduced power
• Poorer fuel economy

How to diagnose it

1. Save freeze-frame data and check live misfire counts to see when the cylinder 6 fault occurs and whether that cylinder is affected.
2. With the engine off, inspect cylinder 6's injector connector and harness for loose pins, corrosion, chafing, or heat damage.
3. Check for related injector or misfire codes and compare cylinder 6's live data with the other cylinders.
4. Use the vehicle's wiring diagram to check the cylinder 6 injector circuit for continuity, unwanted resistance, and a sound connection while moving the harness gently.
5. If equipment and procedures are available, compare the cylinder 6 injector's current waveform with the manufacturer's specification and other injectors.
6. If the wiring checks out, test the cylinder 6 injector winding against the manufacturer's specification before replacing the injector.

Common fixes

• Clean and secure the cylinder 6 injector connector if its contacts are dirty or loose.
• Repair damaged or corroded wiring in the cylinder 6 injector circuit.
• Replace the cylinder 6 injector if its winding or current response is outside the manufacturer's specification.
• Clear the code and confirm the cylinder 6 injector circuit operates normally on a road test.

Can I keep driving?

A steady check-engine light with mild roughness may allow a short, gentle drive, but avoid hard acceleration and arrange diagnosis soon. If the light flashes, the engine misfires severely, or power drops sharply, stop driving when safe; continued misfire can damage the catalytic converter.