Group, I have recently taken my car to Autozone for the Service Engine Light(SEL) Diagnostic, they told me the EGR valve needed to be replaced. During that time the SEL went off about for week by itself,. Came back on so I went back to the Zone and they told me EGR Valve.. My dad and I took off the Valve an it was built up with Carbon I cleaned it out to my best . The Chilton manual say disconnect the battery for 5 min, befor i could make it home the light was back on. So my next step was to just purchase a new EGR V and installed it myself.. Well i disconnected the battery and the light came back on again.. SO my question is to turn off the light does it actually work disconnecting the battery last time i left the cable off for approx. 45 minutes. Or is this a dealer thing where they have too erase the code..???? Your help is needed.. My car has 158k I havent seen that light since it had 40k mile on it.. Mercury Sable LS Duratech engine
thanks
Jay.