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Discussion Starter #1
A wiring diagram for the lambda/o2 sensors... i have replaced it and its not showing still so would like to trace all the wire to the ecu.... anyoe have a diagram?

Dan
 

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Could you explain a little more? What do you mean by not showing? Is this car new to you? Is it the post-cat O2 sensor? Are you positive the car isn't running software that ignores the post-cat sensors to mask carbon buildup?
 

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If it was a normal OEM setup you would see a heater code for the disconnected heater if it was incorrectly wired. Don't think anyone has what you are looking for I have seen this question before, never seen the answer. Best I can offer you is
WDS BMW Wiring Diagram System - 5 E39 from 09/98

Not the easiest to navigate, not all the wire colors but it is better than nothing.
 
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