I've had the car for one year and 2 days and got my first CEL yesterday. []

When I sicked my VAG-COM on it, I got this code:

16840 - EVAP System: Very Small Leak Detected
P0456 - 002 - Lower Limit Exceeded - MIL On

I had this code last fall (intermittent, no CEL) and reseating the hoses on the purge valve behind the airbox solved the problem. No such luck this time.

I leak tested using block 71 in Basic Settings. I removed and replaced the gas cap. I jiggled the hoses on the purge valve again. So far the leak tests have all come up Small Leak, except when I disconnected the left-hand hose from the purge valve and plugged it.

Here's the purge valve:



Here's the hose I disconnected and plugged, which resulted in NO leak detected:



And a diagram out of the Bentley manual:



What I'm wondering is, if disconnecting the purge valve and plugging the line stopped the leak, does that mean my purge valve is bad?

I'm going to buy some reusable hose clamps today, and do some more troubleshooting. So far that one connection was the only one I could remove easily last night without destroying the one-use clamp.

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2002 A4(B6) 1.8TQM, Goodwood Green
Mods: APR Stage 1+, TT225, 710N, APR Snub, JH solid short-throw shifter, Euro shift knob/boot, VMR 18" RS4 Reps w/General Exclaim UHP, 4300K HID D2S, hardwired Valentine 1 w/remote display

I dropped by the local VW dealer on the way home from work and picked up a purge valve. Put it in, cleared codes, ran evap flow and leak tests, passed, problem solved!

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2002 A4(B6) 1.8TQM, Goodwood Green
Mods: APR Stage 1+, TT225, 710N, APR Snub, JH solid short-throw shifter, Euro shift knob/boot, VMR 18" RS4 Reps w/General Exclaim UHP, 4300K HID D2S, hardwired Valentine 1 w/remote display