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To reset the check engine light on a 2005 Chevy Equinox, first disconnect the battery. Next, insert and turn your key in the ignition to the "on" position around three times. This process should clear the data and turn off the light. Reconnect the battery and turn the ignition on. Wait for about a minute, and the check engine light should go off. Essentially, the illuminated check engine light signals an issue detected by the car's engine computer. If the light starts flashing, it signifies a more severe problem like a potential misfire that can lead to catalytic converter overheating. Do not operate your vehicle if the check engine light is flashing.
To clear the engine light, just start the engine and then turn it off three times in a row.