Hi there
This code is for a problem with the purge control valve under the hood. It's possible there is an issue with the wiring, but most often the problem is the solenoid itself. Here is some more info for you.
P0444 MERCEDES-BENZ - Evaporative Emission Control System Purge Control Valve Circuit Open Read more: https://www.autocodes.com/p0444_mercedes-benz.html
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