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It could be many things.... might be as simple as a short in an O2 sensor wire.... might be moving and rubbing metal when facing down hill, then moves away when on level. Did you take your car to Auto Zone ? They can plug in to your on board diagnostic port and run your codes to tell you exactly what the issue is. The service is free and it will only take a few minutes.... good luck

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Q: What is causing my 1993 ford explorer check engine light to come on when driving downhill and turn off when road returns to level or uphill?
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