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There is a lot of things that will make your check enine light come on, but most of the time it is the oxigen senser that goes bad. Most of them are located just below the or on the exaust manafold. Sometimes you my need a deep socket to remove it. I suggest purchasing a Hane's repair manual at your local parts store. It will help you with other problems that may arise.

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Q: Why would the service engine light come on at 125000 miles for a 2000 Chevy Astro van?
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