Replacing the egr valve is quite simple. the line at the bottom of the egr vave needs to be taken off first using an open end wrench.( be careful on this step if the line is broken it can sumtimes get costly) remove the two bolts on each side of the valve then simply swap it out. you might want to replace the gasket while you have it off. make sure when reasemmling it you start the line on the bottom before you but the other two bolts back in.