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Or do you mean the two white plugs at the top of the picture? They don't look familiar from my race car (?!) 525i but then I haven't been in there all that much to remember. I'll take a look when I open it up to fit one of your chips (seeing as the daily 525TDS responded so well).
 
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Discussion Starter #4
It's the one at the back. Watty - the missing relay might be for the lambda heater, there should be lambda heater, DME/Main relay and fuel pump relays.

I've been told it was only on early e34s, and it looks like there are a couple of power wires and some for the aircon connections.

Later cars had a larger loom / multiplug and they were then put in there instead, so it seems to be all sorted for now. I'm just helping out a guy in a different country over email as he's doing an engine swap, and he wasn't sure what that was as there were different plug types on the loom he picked up.
 
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