Question about 1998 Cadillac Seville

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System theft light is on my 1998 cadillac deville why?

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Because cadillac is the biggest garbage on the road stop worrying about your lights and start worrying about your headgasket and transmission. good luck with that car, suicidal northstars just decide to selfdestruct after 100k miles.

Posted on Jul 17, 2009

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With car off, this light should flash on slowly. If on steady, might try doing a reset. Disconnect the battery for 1 hour, hook up and see what happens.

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