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The OBDII system in your vehicle has several sensors that monitor conditions and "report" to the system's computer. When a sensor senses a malfunction, a signal is sent to the computer and the Check Engine light will illuminate. To find the malfunction you have to have the sytem scanned by an OBDII scanner tool for the trouble code(s). AutoZone and similar auto supply stores offer free scans.

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Q: Why is your check engine light on in your 1995 ford thunderbird?
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