6

I have a 2002 ML320 suv. The CEL is on, and the code is P0446. It states that there is something wrong with the evap. system circuit, specifically at the charcoal canister shut-off valve.

I've tried literally everything, (replacing valve, checking the wires, resetting the CEL, etc). But it is still on. I don't think there is a leak anywhere in the evap. system, because this code isn't talking about leaks. So I think the last thing to do now is to check the entire evap. system circuit and check for any loose connections, broken wires.

Does anyone know where I can find a diagram of all the wires of the circuit and where they are located throughout the vehicle?

This is a very time-consuming CEL, and if I take it to the dealer, God knows how much money I'll end up paying.

Improve this question

1 Answer 1

Reset to default
1

This code can also come up from a faulty fuel filler cap gasket or vacuum leak in the soft evap system hoses.
In my experience I had both at separate times. The hoses at the front center of the engine degraded from heat and time.
In both cases simply replacing the parts solved the problem.

Improve this answer

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .