guenterfrost1
Seat Altea Diesel Mixture Preparation Error
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)
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
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?