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i have the same problem i replaced the coolant temp sensor to get my check engine light to go off but it could be a number of things the brake light means you have a problem with the brake system but i have hared that the light sticks and is a common problem with blazers in the late eighties and early nineties models

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Q: Why does only lights on dash that works is check engine light and brake light work on a 1991 blazer?
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