MBENZ_HENRY

Hey guys a while back I purchased my 03 E500, the car needed a bunch of work but I finally got it running really good. I use to notice once every month or so car would kick out a P0456 (small evap leak), so I replaced the gas cap and I haven't seen the P0456 in several months. But today I decided to take the car out after letting it sit for a week, it set off the P0446 and P0456 code. I tried researching the location of canister shut off valve and the charcoal canister, but have had no luck locating on the car or in any technical manuals. If you have and idea, pics or general troubleshooting knowledgeable on the code P0446 and P0456 please post what you may know thx

konigstiger

P0446 = Activated charcoal canister shut-off valve

First step, check o ring (170 in diagram) if fine replace valve (180) current part # 0004707193 + harness 2114400334.

MBENZ_HENRY

I think the biggest problem I have is the location? I looked under the hood, removed lower body panels and fenders if there was a picture of what the shut off valve and canister looked like it would be helpful

cmriv

THis is located in right rear wheeliner area.... IF you have new part, remove rear fender liner and you'll see where it goes. Can be a pita to install though! good luck.

MBENZ_HENRY

Hard to install the valve or the charcoal canister? The car set off of the P0446 code, I was going to try replacing the valve first. Is the valve located in the right rear wheel liner?

konigstiger

Location shown in post 2 thumbnail above. See here for rear fender liner removal: http://workshop-manuals.com/mercedes...ce_and_repair/

cmriv

Canister shut off valve is on actual canister. MOT valve or purge valve located in engine area... has vacuum lines going to and from.