jc_audi_a4_02

This part on my 2002 1.8t is broken (circled in red), as in, half of it is cracked off. It doesn't seem to affect the car. But I don't know what the part is, so I can't do any research on it. Can someone please name this part?

Thanks.

a4audi4fun

Don't know but it looks like some form of check valve. I'd suggest you take your picture into the parts guys at one of the local dealers and ask them what it is. Their BOM's are pretty thorough and then you can decide if you want to pay the dealer price to replace, order on-line or get one from a wrecker.

JAudi

Where on the car is that part located? Can't seem to tell from the photo.

jc_audi_a4_02

On the right (passenger's) side close to the firewall. It's tucked beside the plastic air intake ducting near the air filter. Those other larger lines in the photo are a/c refrigerant lines I believe.

radoadamov

It seems to Me like a non return valve for the vacuum hoses.

seanf

thats a checkvalve, when you hit boost it doesnt allow boost pressure back down the line, only when the engine is pulling a vacuum, thats the hose for the purge valve coming up the side of the airbox correct?? the dealership should have one of those and use fuel injection clamps from napa/partsource/cdn tire to hold the hose on it since you have to cut the onetime use clamps off to get the old valve out.

hope that helps

jc_audi_a4_02

Thanks for pointing me in the right direction guys. I think I've tracked it down. This is the non return valve for the evap canister purge regulator valve (N80). It goes between the evap canister and the intake line in front of the turbocharger. See #3 in the link. audiworld forums thread 2366579

Another link:
audiworld forums thread 339914

I believe the part number is 058 905 291K.

I'm thinking that with this part broken: 1. You could pull unfiltered air into the engine and 2. you might end up with gas fumes from the evap canister in the engine bay.

jc_audi_a4_02

Here are the links. Wasn't allowed to post them previously.

What size vacuum hose for intake manifold item # 18 in diagram ==> - AudiWorld Forums

Replace your 'check valve'! CEL/hard starting cured - AudiWorld Forums

a4rob

its a one way check valve for sure. There are a bunch in the engine bay. Just pull the number off another one and head to the dealer. There about $40.