The check engine light on a 1999 Cadillac DeVille can be reset by disconnecting the battery for 30 seconds. The light will immediately come back on if the problem still exists.
The check engine light would illuminate.
check ground wire on front of engine behind starter.
check on the back side of the engine by looking underneath the car, you should see it there
yes they can just check....... i have a 99 deville
Have vehicle scanned to determine the problem - usually a problem in the emission control system
check your antenna belt/fuse !
It is possible to repair the 1992 deville check engine light if it is malfunctioning.
Take it to Pep Boys
check your answer
Check coolant level Perhaps thermostat is not opening to allow coolant to flow
Check the fuse!