So for awhile now on my 03 W210 wagon I’ve been chasing a large leak code P0455, replaced the canister vent valve, solenoid valve, smoke tested it, OE gas cap, and after market cap, and lastly the pressure sensor in the tank. Only thing left is the charcoal canister itself, but it is unavailable, so I’m at a loss. Anyone run into this issue, or have any suggestions?

Instead of throwing parts at it, have you had it tested with smoke? Sometimes the purge valve starts to stick - a little WD40 helps it.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

Guess you didn’t read my post, I did smoke test it from both ends

How effective is your smoke test? Done by a dealer or shade tree mechanic? My experience is a split rubber hose near the engine compartment. It normally is not gas cap nor components. You can bypass the carbon canister with a rubber hose. Computer cannot tell.

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Not MBZ nor A/C trained professional but a die-hard DIY and green engineer. Use the info at your own peril. Picked up 2 Infractions because of disagreements. NOW reversed.

W124 Keyless remote, PM for details. http://www.peachparts.com/shopforum/mercedes-used-parts-sale-wanted/334620-fs-w124-chasis-keyless-remote-%2450-shipped.html

1 X 2006 CDI
1 x 87 300SDL
1 x 87 300D
1 x 87 300TDT wagon
1 x 83 300D
1 x 84 190D ( 5 sp ) - All R134 converted + keyless entry.

Sounds like a classic case of a lazy purge valve. The OBD test for P0455 isn't actually a leak test. When the purge valve is activated the pressure drop in the fuel tank is timed. If the pressure doesn't drop fast enough, the P0455 code is set and the low fuel lights flashes.....

Valve was replaced ��