Cadillac DeVille Problem Report
Cadillac DeVille Smog Check Failure Due to Excessive Carbon Buildup
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.
Caddy failed due to NOx being too high on both high and low speed tests - Visitor
Car failed for high nox - caddymike
Check coolant level light comes on almost as soon as the car is started. The level has been ch...
check gas cap light will not go out
car is running to lean willnot pass smog. I changed the cat converter,egr vaulve,two o2 sensors...
The EGR control solenoid or EGR valve may fail causing the Check Engine Light to illuminate.
Failure of the catalytic converter can result in illumination of the Check Engine Light.