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Could be several things the most common of which is usually failure to sufficiently tighten the gas cap after putting fuel in the tank. Make sure the gas cap is tightly secure adn then drive for a day or two to see if the emissisons light doesn't re-set itself. If not, there are several toher (more expensive) things to consider. The Oxygen Sensor(s) which sample the air and exhaust, and the possibility that the catalytic converter needs replacement.

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Q: Why is the emissions light on a 2002 Honda CR-V?
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