a 2000 a4 1.8t quattro. Hit the gas and nothing! Error codes are #17965 Turbo Pressure Control (control limit exceeded) and 17963 Max Boost Pressure Exceeded
I bought a new soleniod, by pass valve and a new cut off valve and new hose. Is the wastegate staying closed or open?? Any good DIY pages with the hook-ups of the hoses? It has 68k on it.
Need help!! Alittle guidance and I can fix this, I hope. thnaks John a new A4 owner.

 

I don't know the codes, but it sounds like you are over boosting and going into limp mode. I would check your n75 valve to make sure it is connected right, and test that it has 25-35 ohms across the pins. Also check your boost pressure sensor.

 

the n75, is the solenoid?And The boost pressure sensor? Location? Sorry, I'm new to audi and just ordered the bentley, yesterday. Yes, I am overboosting and going into limp mode, I agree.
The parts I ordered are: 058-906-283 F Solenoid valve( sits in the middle of the boot with a hose to the wastegate and a hose to the turbo), 06a-145-710 cut off valve( underneath w/ the hose to the intake), 034-129-101 b the round spring loaded - pressure regulator overrun cut off valve, is 1st on the boot twards the air box. I bought the car, knowing 2 pcs were broken off.

 

well the one ending in 710 probably isnt the problem I can tell you that for sure Id go to the dealer and ask for a 034 906 283 H thats the Boost controller but the better version

 

The metal one? They have it. the performance version, ok. It's $110. I found a diagram to locate the others. thanks John

 

the N75 is plastic but its holds boost better and smoothes it out, the 710 however can be gotten in metal and around 110 but i dont think thats your problem

 

Boost pressure sensor part number??

 

could the hose to the suction pump for engine vacuum system to intake( L shaped cause the problem?? 058 133 753 B is the suction pump part number. It was split about 3". the hose part number is 058-133-783 L.

 

What should I look for on the wastegate? To determine if it's solid and working? thanks

 

dude the L hose is def. your problem! switch it out in order to get your boost back.