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How do you turn off the check engine light on a 2002 Mercury Grand Marquis?
Wiki User
∙ 15y ago
The owners manual should have a detailed description of how to turn off the check engine light. Unfortunately the process is different for many vehicles. Usually a "scan tool" is required, available for purchase in most parts stores or at Sears. A local repair shop will do it for a small fee. Resetting the light without fixing a problem will result in the light coming back (sometimes only a mile or two later). Fix whatever causedthe check engine light (CEL) to come on in the first place. Most of the time, once the problem is gone, the light will go out after a number of 'drive cycles'.
Also, if the battery is disconnected for some time - maybe 15 minutes (?) - the computer will reset itself.
Wiki User
∙ 15y ago
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