Cadillac Seville SLS Problem Report
Cadillac Seville SLS Check Engine Light Due to Intake Manifold Vacuum Leaks
An intake manifold vacuum leak can develop from a variety of sources, often causing illumination of the Check Engine Light with codes P0171 & P0174 stored. Thorough diagnoses will be necessary to pinpoint the cause in order to make the correct repairs. A "smoke" machine is often used to isolate the cause of difficult to find vacuum leaks.
intake boot cracked due to bad front motor mounts - Visitor
P0101, P0300, P0131, P0171, P0174 - xxxxx
Found a hose was not plugged in, plugged it back in. Error code went away in about 10 seconds. - Visitor
The torque converter clutch (TTC) may stop working due to an internal transmission failure. The...
A Loose or worn gas cap may cause Check Engine Light to illuminate.
The EGR valve may stick open, causing a rough idle and/or the Check Engine Light to illuminate.