Alrighty guys and girls. I wrote on here a while ago that i had a guy work on my exhause and he mistook my verson of a cat back exhaust to rip off the cat converters. My question is this. Even if i put on aftermarket cats will my check engine light still be on. I wont be putting them on a shop will but im not gonna buy them if they arent gonna get rid of that dam light.

Help.

ben

 

I don't think you'll get a light. I have a blower and high-flow cats and I have no light. My chip tune was with factory cats that were clogged, I had no light, and when I replaced the cats I still had no light.

Let's see what some others have to say with similar setups to yours... I think a few people have done this, and I can't recall anyone mentioning the light...

 

my cousin has oversized cats andtrue duals. his engine light when on but it was jsut due to the amount of air going threw. the computer was used to the restrictive ( not by much) stock cats. when they started flowing more air flow they thought the cats were bad. all he did was get the 02 simulaters and but them on the REAR 02 sensors, only the FRONT 02 sensors effect the way the truck runs. the rear just tell u if cats are bad. his were bad jsut differant from what the truck was used to. but no light on anymore after the sims!!

 

SIMULATORS WHATS THAT

 

look them up on summitracing.com, they hook up to the rear 02 sensors...http://store.summitracing.com/defaul...nsor+simulator try that site it should have them.

 

If you cant find those simulators listed for your F150 you can buy MIL elimintaors that fit the pre 05 mustang. I have them on my truck and they fixed my problem, no light and runs great. The ones i have came off my bud's 02 stang

 

I had aftermarket highflow cats on my Mustang and there was not any problems with the light. As long as the o2 sensors are in place your good. Or as mentioned before plug in an eliminator and froget about messing with the o2 sensor.