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940 lambda and catalyst replacement 900 1991

posted by  OwenF on  Sun Nov 4 04:57 CST 2018
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last visit: Sat Jul 7 13:55 CST 2012
[RELATED]

Thanks Spook, good to hear from you. The OBD read-out indicated 2-2-1, this translates as "Fuel supply too weak in part load stage". I took this to suggest that the lambda probe was not monitoring the mixture correctly?

I haven't yet examined the OBD after my 200 mile drive back home, but the car ran OK at speed and the engine temperature didn't deviate from normal.

I did replace the cat with an aftermarket item in 2005 after failing an emission test, but I didn't have to replace the lambda sensor at that time.

I think you are suggesting just replace the lambda sensor then, and see if that cures things? Do you think I need to clean the downpipe as best I can to remove the soot before fitting a new sensor?

Many thanks again

OwenF






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