Cylinder 2 injector leaking or over-delivering (worn, sticking or carbon-fouled nozzle); Injector characterisation or correction data not learned correctly after an injector replacement or ECU change; Wiring or connector fault on the cylinder 2 injector circuit causing incorrect injector response; Excessive fuel rail pressure or a pressure control fault affecting delivery; Mechanical problem on cylinder 2 such as low compression or restricted airflow, causing the ECU to over-correct; Faulty ECU injector driver or outdated calibration (model dependent).

P02CE

Cylinder 2 Fuel Injector A Offset Learning At Min Limit.

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)
CE: FaultThe specific fault in that area

What it means

P02CE means the engine control unit has found that the learned offset for the cylinder 2 fuel injector (bank or circuit A) has reached its minimum adjustment limit. The ECU trims each injector's delivery to correct for wear and tolerance, and it has run out of room to reduce fuel for that cylinder. In practice cylinder 2 is delivering more fuel than commanded, or the injector's learned characteristics have drifted beyond the allowed range.

Symptoms

Engine management light on
Rough idle or uneven running, especially when cold
Misfire or hesitation on cylinder 2
Increased fuel consumption
Black smoke or a strong fuel smell from the exhaust
Possible other fuel trim or misfire codes stored alongside

Possible causes

Cylinder 2 injector leaking or over-delivering (worn, sticking or carbon-fouled nozzle)likely
Injector characterisation or correction data not learned correctly after an injector replacement or ECU changepossible
Wiring or connector fault on the cylinder 2 injector circuit causing incorrect injector responsepossible
Excessive fuel rail pressure or a pressure control fault affecting deliverypossible
Mechanical problem on cylinder 2 such as low compression or restricted airflow, causing the ECU to over-correctrare
Faulty ECU injector driver or outdated calibration (model dependent)rare

How to diagnose

Read all stored codes and freeze frame data, noting any misfire, fuel trim or rail pressure codes alongside P02CE
Check live data for cylinder 2 injector correction or offset values compared with the other cylinders
Inspect the cylinder 2 injector connector and wiring for damage, corrosion, chafing or poor pin tension
Check fuel rail pressure against specification at idle and under load, as the procedure varies by engine
Perform a cylinder balance or misfire contribution test to confirm cylinder 2 is running rich
Inspect for fuel leaks, and check the oil for fuel dilution
Carry out a compression test and inspect the spark plug or glow plug on cylinder 2 as the engine type allows
Check for a relevant ECU software update from the manufacturer if no physical fault is found

How to fix

Replace the cylinder 2 injector if it is leaking or over-delivering, then complete any required injector coding or learning procedure
Repair or replace damaged wiring or connectors on the injector circuit
Correct fuel pressure faults by repairing the pressure regulator, sensor or pump as diagnosed
Repair any underlying mechanical fault on cylinder 2
Reset the learned values and run the manufacturer's relearn procedure after repair
Update the ECU calibration only where an outdated one is a known cause for that model

Can I keep driving?

Medium severity

The car can usually be driven short distances, but get it checked soon. A leaking or over-fuelling injector can wash oil from the bore, dilute the engine oil and damage the catalytic converter, so avoid hard driving if it runs roughly or smokes.

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