Smog Check Failure Due to Excessive Carbon Buildup on Cadillac Eldorado

Excessive carbon build up in the engine combustion chambers may be the cause of a smog check failure due to excess NOx emissions. A "top engine" decoarbonization cleaning procedure will commonly correct this concern.

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Average mileage: (–)
4 model years affected: 1990, 1991, 1992, 1993
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