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					Originally Posted by silverboxter  my 2001 base box has 225,000+ miles.
 note:  engine was replaced at 129,666 with a donor that had 35,000 miles.
 
 still a daily driver.
 
 except that the CEL came on.  passed smog on saturday...with a new non-porsche gas cap.   then on the following tuesday the CEL comes on!
 
 
 could it be the gas cap????
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Yes, it is probably the gas cap. I had the same thing happen last month when I replaced the cap with a Stant gas cap and got a P0455 cel. I replaced it with an OEM cap and the cel has not come back.