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Intermittent CE lights can be caused by dozens of things. A good porsche mechanic who knows how to read a PST tool hooked up to your car running at idle and up to temp can diagnose a lot. My mechanic does this with me a lot. He "watches" the engine run on the computer and then points out the levels of each sensor, etc. and tells me what's going on. It could just be a tank of bad gas.
If it comes on again, you should get it checked out!
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