The ones from us plastic are very high quality. I bought like 7 of them just in case and it was like $7 shipped. There is one check valve you'll have up get from the dealer though. It's the one with 2 ins and 1 out.

 

Where is that one located?

 

I don't remember which one it is. You can tell just by looking at it, but I don't have my car with me right now.

 

Hi all. Newbie here. My wife's got a 2002 A4 1.8T as well. I've got the same problem with the P0171 code and the corroded check valve. Does anyone have the part # for this check valve? Also, this morning when warming up the car, it suddenly died. Tried to restart but it wouldn't come back. Could this check valve be the culprit?

Thanks for your help!

P.S.
Also, wifey said that yesterday while driving home, she heard a humming sound. Could this be the fuel pump?

 

Got the part number(s) for anyone out there that might have some difficulty trying to explain the part to the Parts Dept @ Audi.

There are actually two kinds of these check valves.
1) P/N 058 905 291 K (without the extra nipple)
2) P/N 07C 133 529 A (with the extra nipple)

I'll try to post up some pics later.

Also, I was hoping that the part(s) weren't going to be very expensive. I got mine for $42.38 (before taxes). I also bought 2 clamps/clips that go on either side of the check valve. The part # for the clamp/clip is N 102 334 01.

Wish me luck. I'm hoping the car comes back to life.

If anyone has any other info as to why the car might've died please let me know.

Thanks all!