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If a 1996 Cadillac Sedan DeVille is making a backfire noise from the engine compartment while at a steady speed, it is probably due to a bad oxygen sensor. The vehicle could also have one cylinder that is not firing or a problem with missing exhaust or the catalytic converter.

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Q: Why is your 1996 Cadillac sedan deville making a backfire noise from the engine compartment while at a steady speed?
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