2000 A4 1.8tqm atw
here is a little past info....


so for the the past 3 months i have been driving my car with the cel on(bad rear o2 sensor) and after searching for the spare monies to fix it i got it done and of course when one goes so dose the other. so i replaced both o2's. no sooner than a week later the cel comes back on and it was throwing a maf low voltage code... so that got replaced. so no more cel's.

yesterday on the way to work the car goes into limp mode(5psi boost no cel) so when i got home i scanned it and it threw 2 codes... don't have the VAG scan but the codes are

17535- long term fuel trim bank 1 system to rich.
17965- charge pressure regulation control limit exceeded.

did a boost leak test and throttle body relearn today and didn't find anything so im suspecting a faulty n75 valve. just want some insight before i start to throw parts at it and hope it works, and another question is their a way to test the n75?

let me know whats good

 

Check the vacuum lines leading to the DV and N75 first.

Are you chipped or stock?

 

checked the lines and they seem in good condition and im not chipped....yet