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Purge control valve (under hood as in the pic) make a "tick-tick" noise when it's working properly. Warm the car, stop, pop the hood and listen for the noise and feel the valve as well as it can be felt working. I replaced my own this spring to clear the code, worked like a charm. My mechanic said that the shut-off valve is RARELY at fault.
As for diagnosis, he was able to use the SDS to determine which compenent was faulty. I presume there is some sort of emissions adaptation values or other way, but I didn't get specific with him.
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