Worn or faulty spark plugs across several cylinders; Failing ignition coils (more than one) or coil connector faults; Fuel delivery problem such as weak fuel pump, low pressure or poor-quality or contaminated fuel; Faulty or leaking fuel injectors, or injector wiring faults; Air leaks after the air mass meter or vacuum leaks causing a lean mixture; Crankshaft or camshaft sensor fault giving unreliable timing or speed signals; Low cylinder compression due to mechanical engine damage or valve train problems.

P1341

Multiple Cylinder Misfire With Fuel Cut-off.

BMW
Powertrain
Manufacturer code
High severity

How this code is built

P: SystemPowertrain
1: Defined byThe manufacturer
3: AreaIgnition system or misfire
41: FaultThe specific fault in that area

What it means

On BMW, P1341 means the engine control unit detected misfires on more than one cylinder at a rate high enough to cut the fuel supply to the affected cylinders. This is done to protect the catalytic converter from unburnt fuel and overheating. The ECU sets it after monitoring crankshaft speed fluctuations and finding them beyond the allowed limit.

Symptoms

Engine running rough, shaking or hesitating, especially under load
Loss of power and the engine feeling like it is running on fewer cylinders
Flashing or constantly lit engine warning light
Difficult starting or stalling at idle
Smell of unburnt fuel from the exhaust
Engine running in a reduced-power or limp mode

Possible causes

Worn or faulty spark plugs across several cylinderslikely
Failing ignition coils (more than one) or coil connector faultslikely
Fuel delivery problem such as weak fuel pump, low pressure or poor-quality or contaminated fuelpossible
Faulty or leaking fuel injectors, or injector wiring faultspossible
Air leaks after the air mass meter or vacuum leaks causing a lean mixturepossible
Crankshaft or camshaft sensor fault giving unreliable timing or speed signalsrare
Low cylinder compression due to mechanical engine damage or valve train problemsrare

How to diagnose

Read all stored fault codes and freeze frame data, noting engine load, speed and temperature when the fault set, and check for other misfire, fuel trim or sensor codes
Check the misfire counters per cylinder in live data to see which cylinders are involved and whether the misfires are random or specific
Inspect spark plugs and ignition coils for wear, cracks, oil contamination or damaged connectors, checking the service history for plug age
Inspect the intake system, hoses and vacuum lines for splits, loose clamps and leaks, and review fuel trim values for signs of a lean mixture
Check fuel pressure and volume against the specification for the engine, and consider the quality of the last fuel used
Test the injectors and their wiring for resistance, supply and control signals as appropriate for the engine
Check crankshaft and camshaft sensor signals and wiring, and compare actual and expected timing
Carry out a compression or leak-down test if the electrical and fuel systems check out, as the procedure varies by engine

How to fix

Replace spark plugs as a full set with the correct type for the engine
Replace faulty ignition coils and repair any damaged connectors or wiring
Repair fuel supply faults such as a weak pump, blocked filter or pressure regulation fault, and drain and refill with good fuel if contaminated
Replace or professionally clean faulty injectors and repair their wiring
Repair air or vacuum leaks and replace damaged intake hoses or seals
Replace faulty crankshaft or camshaft sensors, or carry out the necessary mechanical repairs if compression is low

Can I keep driving?

High severity

Avoid driving the car, or limit it to a short, gentle trip to a workshop, because continued misfiring can overheat and damage the catalytic converter and the engine. If the warning light is flashing, stop and arrange recovery.

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