Recently I realized that the check engine light came on in my 99 XJR, right before I needed the emissions tested. The emissions center's computer read that it was an EGR Valve error. The check engine light will go off for a few days every once in a while. I also receive a warning stating that my engine coolant is low, it will also go on and off. Once cool, I check the coolant level and it is fine. Has anyone else had this issue? What am I looking at for a repair bill?