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Could be lots of things. Your car is equiped with a way to read the codes. Go and buy a manual. It will be in there. It is as easy as using a paper clip to jump a two pin connector under the glove compartment. It has a blue cover. But you won't know what the codes mean unless you have the book. Good luck. you can also go to your local auto parts store and they can run the codes for you. Just type in the code into Google and it will tell you the most likely problem.

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Q: What causes the check engine light to come on on a 1989 Honda Prelude SI?
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