[Matt Devo]

Any advice on how to proceed would be appreciated.

• check vacuum line from solenoid to actuator
• check actuator can be moved by hand
• perform calibration in VCDS (after running/shutting down car - needs vacuum), see if actuator moves properly, see if actual value changes in VCDS

if I had to guess, the flap position sensor on the end of manifold has died, and everything is working but you're getting a constant position reading of 0. Replace the sensor (requires pulling the manifold, at least on the RS) and you'll be good

 

[Matt Devo]

Audi dealer diagnosed problem as a faulty sensor. Part is $180 and over 4 hrs in labor. The sensor is buried in the engine. I have an appointment for next week for the repair.

sensor is $40 and it's a 4hr DIY. no special tools needed.

 

[Matt Devo]

Matt, the price you listed for the sensor must be an Audi equivalent. Where did you find it? As for a DIY maybe I could do it and maybe not. I’ve not done much with this engine and if I mess up the dealership is 100 miles round trip. Thanks for the encouragement.

yes, the sensor is made by VNE and part # is 9101170. A quick search shows I was a bit off on my price, it's around $65 USD.