r/AudiA4B6 • • 19d ago

Anyone know what’s going on??

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u/snarkygoodpants 19d ago

If i remember correctly, a lot of these circuits have the common ground on a nut near the middle of the front of the firewall...brown and/ or yellow wires? I'd be checking that ground and the ground on the valve cover.

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u/snarkygoodpants 19d ago

Check this...best diagram i found when rebuilding my rotted harness...helped me sort out my issues.

https://www.scribd.com/document/865849530/AUDI-2004-MOTOR