Check Engine Light P0455, P0441, P0456

[CTScott]

That series of codes indicates that the system lost pressure while doing the evaporative check that the system initiates when the car has been powered off for 5 hours.

It very well could be the gas cap, but also could be the Purge VSVm or the canister itself, or the lines between the VSV (under the hood) and the canister (at the rear of the car).

You won't see any obvious effects, as this whole thing is purely a vapor recovery system, and unless the primary vacuum hose to the VSV fails, you will never see it effect how the car runs.

[bronsin]

Originally Posted by CTScott

That series of codes indicates that the system lost pressure while doing the evaporative check that the system initiates when the car has been powered off for 5 hours.

It very well could be the gas cap, but also could be the Purge VSVm or the canister itself, or the lines between the VSV (under the hood) and the canister (at the rear of the car).

You won't see any obvious effects, as this whole thing is purely a vapor recovery system, and unless the primary vacuum hose to the VSV fails, you will never see it effect how the car runs.

So it wont hurt the car to run it?

Is it true most of the error codes wont hurt the car if not fixed?

What error codes should we be worried about in terms of dammaging something?

Thanks!

[CTScott]

Originally Posted by bronsin

So it wont hurt the car to run it?

Is it true most of the error codes wont hurt the car if not fixed?

What error codes should we be worried about in terms of dammaging something?

Thanks!

Correct - That slew of codes will not prevent you from running and you will only "hurt the environment" by running with them.

Codes related to anything other than the evaporative emissions system would be ones you would worry about.