[QUOTE=DonB]I'm trying to solve a CEL problem (code P0455) on my 1999 C230-Kompressor. I've already replaced the gas cap so I'm on to the next likely culprit, the "Charcoal canister shut-off valve" but it isn't where I thought it would be.

Does anyone know where to find it? I took some pictures of where I expected to find it. They're from the rear, passenger-side wheel well with the liner removed. Thanks,

Don[/QUOTE
have you checked the regeneration valve? i have seen a few of them not cycle propery not allowing enough vacuum go to the tank and set that code.
on the 202 chassis the the canister shutoff valve is the white canister next to the charcoal canister, which on this model is down by the fuel pump and filter