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Old 30th January 2011, 18:46   #1
Schtozo
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I need e39 m5 oxygen sensors wiring diagrams please

Hi, i registered just for this for now, please be gentle on me
A friend of mine has a 2000 (EURO) e39 m5 overseas and recently had an issue.
He was cruising around and the guibo failed and somehow it managed to rip all the oxygen sensors wiring harness. If i understood right, there is a big harness that comes from the ecu and it splits into four smaller ones each containing 4 cables that connect to each oxygen sensor, those all ripped apart leaving a spaghetti of wires and now he is lost with the wires and cannot find any diagrams to help him. So please if someone points me in the right direction i will appreciate it.

Cheers
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Old 30th January 2011, 18:59   #2
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If the connectors on the wiring loom are missing,the pre-cat sensor connector is the same as the post cat connector on the wiring loom and the post cat sensor side connector is the same as the pre cat connector on the wiring loom...

So buying a set of pre and post cat sensors and he has the new connectors he needs for the engine wiring loom
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Old 30th January 2011, 20:08   #3
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If the connectors on the wiring loom are missing,the pre-cat sensor connector is the same as the post cat connector on the wiring loom and the post cat sensor side connector is the same as the pre cat connector on the wiring loom...

So buying a set of pre and post cat sensors and he has the new connectors he needs for the engine wiring loom
Thanks, let me see if i understood right, if he is missing the 8 plugs/ connectors then he will need 8 new sensors so he can rewire the loom that comes from the ecu and of course to the sensors? And then if he is missing only the connectors of the car side of the loom he only needs to buy 4 new sensors pre and post and then match the wiring loom with the plugs?
One more thing he told me is that each sensor has four wires, 2 black and 2 white but the car loom has different colours. Does that mean he has aftermarket sensors or they are supposed to be like that? Is there any difference between euro and us models?
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Old 6th October 2012, 17:28   #4
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wow this happened to me as well!



What did you end up doing?
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Old 7th October 2012, 19:40   #5
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On a somewhat related note, my car has a third plug on the drivers side of the vehicle coming off this harness. It's little plastic cover mounts directly behind the oxygen sensor connectors, but I can't seem to remember what it plugs into. Where should I be looking?
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Old 7th October 2012, 20:24   #6
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EGT is on the left cat. They were recalled and deleted. If you have no extra wire coming from the cat then the plug is redundant.
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Old 7th October 2012, 21:32   #7
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Good to know, I probably should have asked before spending an hour removing heat shields and poking my fingers in small spaces looking for a missing plug.
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