i have a dc sport header with Random Technology cat. Last night driving on the freeway the "check emission system" light come on. Before the Random Technology Cat i had a T1R test pipe with CEL eliminator. The Random Technology Cat doesn't have a CEl eliminator. If I install a CEL eliminator on the Random Technology Cat will the "check engine system" light go away? Or what can I do to get rid of the light.

 

i had the same problem you need to get an O2 spacer for the 2nd oxy sensor buy this one, screw it on, and the CEL wont come on anymore

http://store.excelerateperformance.c.../i-149537.aspx

and i dont know if youve ever reset your ECU since your mods but you should disconnected the neg terminal on your battery for 10 mins and that should reset the ECU to learn your mods and also clear the CEL

 

thanks