I Have A 2001 Cadillac Seville, SLS. When My Mechanic Replaced The EGR Valve He Mentioned Another Part Of The EGR System That Should Also Be Replaced.What Is That Part? Is It The EVAP Purge Solenoid Or Another Part?
I need to know what this part is so that I may buy it and install it myself (if possible) because my car will not pass my state's emission testing standards the indicated reason being the EGR system has a problem. Whereas I have already replaced the EGR valve the problem has to be the other part that the mechanic mentioned , which he thought would only be available from a Cadillac dealer.

