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View Full Version : 2007 Audi A4 Quattro - problems after battery disconnect and putting new relays in.



Mowu
12-28-2020, 06:32 PM
Long story short, ended up trading a guy for a 2007 Audi A4 Quattro. Someone had been inside the ECU box and cracked it. Rain storm came in and I didn't realize the ECU box got water in it and shorted out my relays. Cooling fans would come on and run until battery died.

So I bought new relays and got all that fixed, fired the car up after fixing the relays and it ran fine.

VERY next day, CEL is on and before all this, when I would crank the car up, the boost gauge would start off at -10 and the car was super loud (it's straight piped), then after it warmed it the car would quiet down and the boost gauge would go to it's normal -20 PSI.

Now, after putting in the relays, CEL came on, and when I crank the car up on cold start the boost gauge SOMETIMES starts off at -20 and the car isn't all that loud like it was.

Current mods that I KNOW OF

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Photo of my car

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