I have had issues with my purge control valve, or also called fuel tank breather valve thats under the hood, I replaced it twice when I have gotten codes.

I just noticed that it "clicks" - like on/off fast when the key is in number #2. NOT getting any codes for it and not sure if it clicks when the eng is running - cant hear with eng noise.
Should it be clicking?

thanks!

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2004, X5, 3.0, 202k+