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guenterfrost1

Seat Altea Diesel Mixture Preparation Error

I'm experiencing a mixture preparation error with my 2011 Seat Altea diesel. Symptoms include reduced engine power, the check engine light is on, rough engine running, jerking during acceleration, and occasional engine stalls at idle. I suspect a defective injection valve or injector. Any ideas?

Summary of the thread

A 2011 Seat Altea diesel is experiencing a mixture preparation error, leading to reduced engine power, a check engine light, rough running, jerking during acceleration, and occasional stalling. The suspected cause is a defective injection valve or injector. After confirming a defective injector, all four injectors were replaced, resolving the issue.

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4 comment(s)

ralfbraun4

Sounds familiar. I had similar issues on my old Renault Megane. Check engine light, rough idle, the works. Could be fuel injection related. Do you know when the spark plugs were last changed?

guenterfrost1 (community.author)

Spark plugs were replaced about 10000 km ago. The error code points towards a rich mixture. Could a faulty oxygen sensor cause these symptoms along with a fuel injection problem?

ralfbraun4

Ah, rich mixture makes sense. Mine never showed that specific code, but it was a bad injector. I'd get it checked professionally. Probably best to take it to the workshop before things get worse.

guenterfrost1 (community.author)

Defective injector confirmed. I replaced all four to be sure. Total cost 515€, thanks for the help.

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SEAT

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ALTEA