Faulty, clogged or leaking fuel injector on cylinder 10; Air leak at the intake manifold gasket, runner seal or vacuum hose serving cylinder 10; Injector wiring, connector or driver fault affecting cylinder 10; Exhaust leak or faulty oxygen/air-fuel ratio sensor on the bank containing cylinder 10, giving a false mixture reading; Low or uneven fuel pressure or a restricted fuel supply to that bank; Mechanical fault on cylinder 10 such as low compression, a valve or valve timing problem; Carbon build-up on intake valves or ports on cylinder 10 (depends on engine type).

P02BE

Cylinder 10 - Fuel Trim at Max 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)
BE: FaultThe specific fault in that area

What it means

P02BE means the engine control unit has found that the individual fuel trim correction for cylinder 10 has reached its maximum limit. The unit is adding or removing as much fuel as it is allowed for that cylinder and still cannot bring the mixture to target. It is only relevant to engines with ten or more cylinders, and which physical cylinder is number 10 depends on the manufacturer and engine.

Symptoms

Engine management light on
Rough idle or uneven running
Hesitation or flat spots under load
Poor fuel economy
Possible misfire on one cylinder or one bank
Smell of fuel or raw exhaust

Possible causes

Faulty, clogged or leaking fuel injector on cylinder 10likely
Air leak at the intake manifold gasket, runner seal or vacuum hose serving cylinder 10likely
Injector wiring, connector or driver fault affecting cylinder 10possible
Exhaust leak or faulty oxygen/air-fuel ratio sensor on the bank containing cylinder 10, giving a false mixture readingpossible
Low or uneven fuel pressure or a restricted fuel supply to that bankpossible
Mechanical fault on cylinder 10 such as low compression, a valve or valve timing problemrare
Carbon build-up on intake valves or ports on cylinder 10 (depends on engine type)rare

How to diagnose

Read all stored and pending codes and the freeze frame data, noting any misfire, fuel trim or sensor codes for the same bank.
Check which physical cylinder is number 10 on this engine using the manufacturer's data.
Compare short and long term fuel trims on both banks and look for a pattern at idle versus load.
Visually inspect the injector connector and wiring for cylinder 10, and the intake manifold, vacuum hoses and exhaust for leaks or damage.
Use a smoke test on the intake system to find air leaks near cylinder 10.
Check fuel pressure and, if the engine allows, view live cylinder balance or misfire counts for cylinder 10.
Test injector resistance and operation on cylinder 10 and compare with the other injectors, or swap it with a known good cylinder to see whether the fault follows.
If the fuel and air checks pass, carry out a compression or leak-down test on cylinder 10.

How to fix

Clean or replace the faulty fuel injector and renew its seals.
Replace leaking intake manifold gaskets, runner seals or split vacuum hoses.
Repair or replace damaged injector wiring or connectors.
Repair exhaust leaks and replace any faulty oxygen or air-fuel ratio sensor confirmed by testing.
Restore correct fuel pressure by fixing the fuel pump, filter or regulator fault found.
Carry out the necessary mechanical engine repair if cylinder 10 has a confirmed compression or valve fault.

Can I keep driving?

Medium severity

The car can usually be driven gently for a short time, but book it in soon. A persistent lean or rich condition on one cylinder can cause misfires, overheating of the catalyst and engine damage, so stop driving if the engine misfires badly or the warning light flashes.

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