Need help for possible electrical issue

A6 All/ S6 All
#1

Hello,

I’ve been doing all the mecanical reparations myself, but now it seems that I’m having electrical issues, atleast thats what I think, and it is completely outside of my knowledge.

I have many codes, shown in the pictures, EPC light, ESP fault, meaning the car is in slow mode IF it starts. There is, sometimes, and during longer drives, a white smoke coming out close to the firewall in the passenger side engine bay that doesnt really smell like burnt oil or coolant (burning wires? short?) (valve cover gaskets changed 3-400 kilometres ago and no visible leaks). I possibly have a problem with my fuel system, which MIGHT be the cause of the fuel pressure regulator codes, but they appeared at the same time as all the other codes, and the car drove pretty much perfectly before.

I want to know if some knowledgeable people might point me in a direction before I bring it to a shop and spend big money for some possible small fixes (I hope)…

Thanks

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#2

Have you done anything related to wiring recently?

#3

No, the night it happened I just came back from a test drive after fitting two new fuel lines, but havent touched anything remotely electrical. After coming back from the test drive, it just stalled after like 5 minutes of idle. Completely out of nowhere

#4

Well, it is indeed strange. If you haven’t crushed any wires during manifold install, I’d guess your other options are

  • some kind of animal chewed up your wires somewhere
  • maybe somehow your ECU was damaged?

Check for all the ground connections you were near during fuel lines job - two on the fronts of each head. It could’ve been weak and you somehow damaged it more.

If nothing visual comes up, I’d start with erasing your fault memory, and checking which ones come back on the spot, with only ignition turned on. If you do, report what happens and we’ll go from there.

#5

Both grounds were tight and the wires seemed undamaged.

After clearing the codes and turning the key in accessory, no codes showed up.

#6

Ok, try to run the car now in order to see if they come back, and if so, at what circumstances. Keep an eye on that smoke you mentioned though.