Hello, i am the owner of a 316i, but my wiring harness is modified by previous owner... What i think ive done wrong is the lambda sond, i had to guess which cables where right. Do you have a diagramme for this, or can you tell me the correct colours?
Thank you.

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We don't have your vehicle here in the US, so I don't have the wiring.

I would check that the heater on the o2 is wired properly first. Once you get those two wires out of the way, you can sort out the other two by trial and error.

- Nick

O2 sensor problems
 

Oh i see.. I really do not know anything about it.. My problem is that i have to make own connectors, as the original has melted or for whatever reason it is no longer there.. That is my problem.