naaaah.......your CEL fix should work......I'll come by saturday or something and help you look at it..........but it might be another code thats causing the CEL get it pulled at autozone.......for free.....like FutureProspect said the p0420 is for the missing cat(s) but you may have a leak from the install somewhere and that code is a P0180 or something like that....... .....


Oh and if you use the UTEC to eliminate CEL's bad idea because it just shuts all CEL's off........so you never really know......if you have a serious problem......its good for a temporary fix like I did......but its better to do a CEL fix for UP and DP.....