'check engine' light inidicated 3x in two weeks

and related to charcoal canister control valve.<br><br>
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Dealer has replaced 2 control valves, gas filler cap and is now replacing ECM because of intermittent power to control valve.<br><br>
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The car is a 2001 CLK320 (U.S. spec). Anyone else encountered problems like this? The car had 4,800 miles on in when this problem developed.<br><br>
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Otherwise, everything works just fine - just the emissions controls issues going on.<p>