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mats_schulze1

Mini Roadster Mixture Preparation Error

My 2014 Mini Roadster is exhibiting a mixture preparation error. Symptoms include reduced engine power, the check engine light is on, rough engine running, jerking when accelerating and the engine stalls at idle. My suspicion is a defective injection valve or injector. Any similar experiences?

Summary of the thread

A 2014 Mini Roadster is experiencing a mixture preparation error, leading to reduced engine power, a check engine light, rough running, jerking during acceleration, and stalling at idle. The suspected cause is a defective injection valve or injector. After replacing all four injectors, the car runs smoothly again, confirming the initial suspicion.

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4 comment(s)

tobias_eule1

Reduced engine power and jerking? Sounds familiar. I had similar issues with my Mini, though it wasn't the Roadster. Did the check engine light come on for you as well? I seem to remember reading something about the oxygen sensor being related, or perhaps even the catalytic converter. Is it possible that the throttle body could be dirty?

mats_schulze1 (community.author)

Was your engine stalling at idle too? And did a specific error code point to the injectors? I've already checked the spark plugs and those seem fine.

tobias_eule1

Yes, the engine stalling at idle was definitely happening, and yes the check engine light was on. I can't recall the exact error code now, but the workshop diagnosed it as an injector issue after some testing. I would recommend you go to a workshop.

mats_schulze1 (community.author)

It was indeed a defective injector. Replaced all four, and the car runs smoothly again. Total cost was 515€. Thanks for your input.

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MINI

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ROADSTER