I had the purge valve replaced about 6 months ago. P1444 was the code at that time and it is now back. The check engine light comes on and may stay on for a day or two or maybe up to a week. Does eventually go off and may stay off for days or even a couple of weeks. My mechanic doesn't think the "new" purge valve is bad and that it might not have even been bad when it was replaced. However that is the only code that comes up. Don't know if it is significant but sometimes only the check engine light comes on and sometimes the center dash message board also comes on that says "check engine electronics". The latter message is a real pain since you lose mileage, time etc. and it looks worse than it is. Needless to say, car seems to run fine. I did replace gas cap just in case-no help. Any help is sincerely appreciated.

From what I can tell, p 1444 says " purge valve open circuit ".
You may want to have a very close look at the connector & the wire.

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2007 C 230 Sport.

I checked connections and they are fine. The more detailed explanation for P1444 is as follows: (all conditions must be met simultaneously and happen 2 consecutive times to activate light)

purge control valve closed
no deceleration fuel shut-off
momentary intake air temp> +10 degrees C
evaporation ratio not in 40-60% range

Don't know if that is any help.

Pull the vac line off the valve between the valve and the canister.
Blow some WD40 in the line and put it back together.
The valve gets gummed up from the fuel vapors and sticks closed.
You can feel the pulsing of a properly operating valve in you hand.

The valve has been loosened up because I can feel it moving when you touch it. I am quite sure the valve is working properly. (it was a new one as well) I still get the same code (p1444) as before. I have determined that I can get the check engine light to go off (as well as the big display that says "check engine elctronics") by turning the key to the on position (not starting car) and then off again several times. Don't know what that means. Is that merely resetting/erasing code or could that be symptomatic of the cause of the problem?