Fault p0456 evap very small leak

[Sukks2bu]

Got this error message twice now.
Scanned it with vagcom, then went and filled up at the gas station and made sure gas cap was on good. I cleared the code and it didn't return until I was low on fuel (50klm remaining).
Refuelled, and cleared code again.
It still hasn't come back, but I'm waiting to get to 50klm remaining again to see if it returns.

Also, when I got tuned at Unitronic, they did remove the supercharger.
All hoses were reconnected at the time. It's been about a year.

Gas cap??

[S4Phantom]

Very Small leak is usually the gas cap. They're cheap so just put a new one on and clear the code and see what happens

[jomama229]

i got this same fault code recently. from what i've read, it could be the purge valve that sits by the throttle body. my code hasn't come back so i haven't investigated further. and from what i'm told, a loose gas cap doesn't trigger a very small evap leak.

[Sukks2bu]

i got this same fault code recently. from what i've read, it could be the purge valve that sits by the throttle body. my code hasn't come back so i haven't investigated further. and from what i'm told, a loose gas cap doesn't trigger a very small evap leak.

Ok, standing by for more replies.
Thanks for your input.

[ehofmann]

I think there is a tsb or warranty extension for the natural vacuum leak detection switch. Look it up. I have the letter at home.


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[S4Phantom]

and from what i'm told, a loose gas cap doesn't trigger a very small evap leak.

Only reason I went with the cap, is that in the shop I work in we've fixed cars (not necessarily Audi's) that had the same code with a gas cap. Small Evap is usually not the cap, but we've fixed VERY small, with a new cap at times

[Sukks2bu]

Well, I cleared the code last time and refuelled before I got to 50klm left in the tank and the code hasn't returned. I'm going to try running low on fuel again and see what happens.