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How do you check the check engine light on a 1989 cadillac sedan deville?
Wiki User
∙ 14y ago
From the climate control system, which acts as the diagnostic computer. Press and hold the off and warm buttons together. You will see the system 888 then 7.0 then the active codes will start to show. Write them down. You can Google amost any code you find. To clear all the codes, press and hold the off and high buttons together.
Wiki User
∙ 14y ago
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