My understanding is that if it is really serious the CEL will be blinking. I agree with Hamstuh, check the light. You can get a cheap scanner for less than $20 on Amazon, I keep one in my Boxster because I get intermittent codes on sensors that seem to be approaching their end of life. I check that they are not serious/important and turn them off.
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Grant
Arctic Silver 2000 Boxster S - bought with a broken engine, back on the road with the engine replaced
Green 2000 Boxster 5-speed and 1978 928 auto
1987 924S 5-speed (Sold) - Blue 2000 Boxster 5 spd (Sold)
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