i have 06 coronado 515hp w/egr did a complete o/haul ,new pistons/sleeves/ bearing and have no power.no chk eng light
but these dash code contrll no resp 236s254 07.
Now try www.egrtuner.com from Jeff Justus. I know of several people that have had good results really dialing back the amount of EGR that is used. Very reasonable price as far as mods go.