P0456 - Small Evap Leak

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Mar 16, 2009 | 06:00 PM

treiberg

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2003 C230 and 2005 C230

P0456 - Small Evap Leak

Check Engine lights give code P0456 (on '03 C230), which is a slight leak from evap system. I keep resetting it and it keeps coming back, even with gas cap srewed in tight. Anybody out there found a solution? I guess I may need to replace my gas cap. How do you remove the cap, or is it possible to just replace a seal or o-ring in the cap? What else should be checked? Hoping folks out there have found a common fix for this one. Thanks.

Mar 16, 2009 | 06:09 PM

LILBENZ230

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2019 G70 6MT & 2022 Ford Maverick XL

It could be numerous things. I had this code on my 05 C230 and it turned out to be a small leak in the fuel filler neck.

Mar 16, 2009 | 06:49 PM

nlpamg

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2019 GT3 RS, 2017 M3 30 Jahre

I've had/have the code as well:

https://mbworld.org/forums/c-class-w...-cold-cel.html

good luck and let us know what happens

Mar 16, 2009 | 07:04 PM

Glyn M Ruck

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late 2009 CLK 350 Coupe Elegance, '65 Jaguar S Type wires

Oh! dear - here we go again - could be charcoal canister or cap or a leaking purge valve. I recommend you start with a smoke test of the system under pressure.

Mar 16, 2009 | 08:58 PM

LILBENZ230

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A smoke test is what it took on my car to diagnose it. This was after they threw a purge valve at it as a guess.

Mar 23, 2009 | 11:21 PM

treiberg

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2003 C230 and 2005 C230

How do you do a smoke test? I searched to no avail....

Mar 24, 2009 | 10:23 AM

drb930

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2005 C230 Sport Coupe

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Mar 13, 2010 | 05:00 PM

06E55

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Quote:

Originally Posted by Glyn M Ruck

Oh! dear - here we go again - could be charcoal canister or cap or a leaking purge valve. I recommend you start with a smoke test of the system under pressure.

What charcoal canister are you referring to? I just had my CEL come on last night in an 06E55 and this was the code...