my cel was on / off. local wrench kept the 986 for 3 days and couldn't get it to come on again. he said it will try to 'fault clear' itself. drove it for another 3-4 weeks and it came back & stayed that way. took to porsche dealer and got a free, warranty supported cat converter.
you really never know what a cel could be. i've been told to take your box in to an autozone which will give a free cpu scan. scribe the code and go over to rennlist.com to decode the code. from there you can maybe call your wrench/dealer and save some time.
hope it all works out ok....
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