Engine wiring harness

[Cmacgregor]

I have been getting a intermittent power code on my 2006 B7 A4 3.2L. My mechanic has said to try and find an engine wiring harness however I can not find the part number. I also can't find any for an A4. So 3 questions here.

1. Where can I find the part number for my engine wiring harness?

2. Can I use an engine wiring harness from a 2006-2009 b7 A6 that had a 3.2L engine?

Dose anyone have any recommendations on how I can go about dealing with the intermittent power to bank 6 in any other way other than a new harness?

[xRenesis]

do you have the actual code? intermittent power where/to what?

Given the age of the cars and wire used, if it isn't say a mouse problem, the wires could be flaked and touching something. With the easy/quick fix to that is tape, next be wire replacement.

[Cmacgregor]

P0390 is the code

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It will come on for a moment or 2 and then I clear code it's good for a week ro so