Mokka mixture preparation error

My 2013 Vauxhall Mokka diesel is throwing a 'mixture preparation error'. It's got 147992 km on the clock. The check engine light's on, power's way down, and the engine's running rough. It's jerking like crazy when I try to accelerate, and sometimes it even stalls at idle. Could it be the mass airflow sensor or maybe even a spark plug problem?

4 comment(s)

I understand your frustration. I had a similar experience with my old Peugeot 308 (gasoline engine). The check engine light illuminated, and I experienced a reduction in power. The engine was also running rough. Such symptoms could be caused by a number of factors, but it's important to systematically rule them out. Have you checked your air-fuel ratio? A faulty sensor could indeed be the culprit.

Air-fuel ratio, eh? I haven't checked that specifically. Where exactly did you start looking on your Peugeot? Was it something simple, or did you end up chasing ghosts?

Given the array of symptoms you're describing with your Vauxhall Mokka, and considering my experience with the Peugeot 308, I'd recommend consulting a qualified mechanic. I wasn't able to resolve the issue myself, and it turned out to be a defective injector, which I wasn't equipped to diagnose or repair at home. It could be the same for you.

Thanks for the advice! Dropped it off at the workshop, and you were spot on – faulty injectors. Cost me 515€, but at least it's running smoothly again. Appreciate the insight!

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