Welcome! Slightly OT (or maybe not), I saw a post here a few years ago referencing a central grounding point somewhere behind the fuel meter assembly that feeds the lambda control unit. Can anyone point me to that post?

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1988 300E
1993 300SL
1994 540i

If I have a problem with my Mercedes, I go to MercedesShop. If I have a problem with my BMW, I go to BimmerNut.
If I have a probem with my Dell, I reboot it. I was an engineer for them for 10 years and we blamed everything on Microsoft.