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The CEL will stay illuminated until no fault is detected for three drive cycles. A drive cycle is basically starting the car bringing it up to operating temperature and driving it long enough to allow the completion of all OBD tests to be completed. If you are interested in doing your own maintenance on your vehicle I suggest on investing in the following three items. 1. The Bentley Manual. 2. A inexpensive OBD II scanning tool. 3. Wayne Dempsey's 101 projects for your Boxster book. All tolled $200 bucks worth of info you can use to help diagnose and navigate the engine and systems of your vehicle. So when JFP tells you what is likely wrong, you know how to get to it and the torque values etc. needed to put things back together.
Good luck,
Eric
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