Got my first CEL today, P0456 - EVAP System Leak
Thread Starter
Audiworld Junior Member
Joined: Dec 2010
Posts: 78
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From: Toronto, Canada
Got my first CEL today, P0456 - EVAP System Leak
Not really the milestone I was looking to hit but when I left the house this morning the car threw a code.
Scanned it with the VAG and saw the following:
Mode 03: Emission related fault codes
Address 7E8: 1 Fault Found:
P0456 - EVAP System: Very Small Leak Detected
I did a search on the forums and didn't find anyone with this issue on the B8 so I must be the lucky one.
I re-filled the gas tank, checked the gas cap, and cleared the code. So far it hasn't returned after about 50km of driving.
Car only has 3000km so far.
Scanned it with the VAG and saw the following:
Mode 03: Emission related fault codes
Address 7E8: 1 Fault Found:
P0456 - EVAP System: Very Small Leak Detected
I did a search on the forums and didn't find anyone with this issue on the B8 so I must be the lucky one.
I re-filled the gas tank, checked the gas cap, and cleared the code. So far it hasn't returned after about 50km of driving.
Car only has 3000km so far.
Thread Starter
Audiworld Junior Member
Joined: Dec 2010
Posts: 78
Likes: 0
From: Toronto, Canada
I also cleared it in case it was just a fluke situation that threw the code.
AudiWorld Member
Joined: Jun 2015
Posts: 67
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From: Burlingame, CA
My car has about 83k on it. Is it possible that the gas cap is worn out and not sealing properly anymore? It's certainly been on and off a lot in 83k miles but I wouldn't think an item like that would fail.
Other than the cap, what else should I be checking?
AudiWorld Super User
Joined: Jul 2008
Posts: 2,721
Likes: 367
From: Silicon Valley
Sorry to revive an old thread, but I'm having this problem on my 2010 S4. I've cleared the code, tightened the gas cap, but it keeps coming back in 500 or so miles.
My car has about 83k on it. Is it possible that the gas cap is worn out and not sealing properly anymore? It's certainly been on and off a lot in 83k miles but I wouldn't think an item like that would fail.
Other than the cap, what else should I be checking?
My car has about 83k on it. Is it possible that the gas cap is worn out and not sealing properly anymore? It's certainly been on and off a lot in 83k miles but I wouldn't think an item like that would fail.
Other than the cap, what else should I be checking?
https://www.ecstuning.com/b-genuine-volkswagen-audi-parts/charcoal-canister/8k0201801c/
B8 S4 Engine Study Guide
"Evaporative Emission (EVAP) Canister Purge Regulator Valve N80"
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AudiWorld Super User
Joined: Jul 2008
Posts: 2,721
Likes: 367
From: Silicon Valley
It is part of the OBDII EVAP system and has been in all the US cars since the 1970s, to prevent gasoline vapors from being released to the atmoshere.
"Evaporative emission controls were first required on cars sold in California in 1970. EVAP has been used on all cars and light trucks since the early 1970s. "
EVAP Evaporative Emission Control System
In the older cars, it was a metal canister, but many newer canisters are plastic, which degrades over time.
"Evaporative emission controls were first required on cars sold in California in 1970. EVAP has been used on all cars and light trucks since the early 1970s. "
EVAP Evaporative Emission Control System
In the older cars, it was a metal canister, but many newer canisters are plastic, which degrades over time.
Last edited by m444; May 7, 2016 at 10:40 AM.
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