Ok Friday I took my cats off, which before I did that I replaced the 02 sensors with the sims. My service engine soon light is still on. Do I need to unplug the battery and let it sit or maybe do I have4 faulty 02sims. I don't know, it seems to run ok but damn it's loud and the yellow light is bothering me. any help?

 

Did I read that right? You put 4 sims on it? If so, thats the problem.

 

no i just put sims in the back behind where the cats were. sorry still early and the damn time change is throwing me off. 2

 

You may have gotten the wrong sims .. I read on here a while ago that the truck sims aren't wha teverybody thinks they are and gets te wrong one or something like that.

 

I don't know they plug in just fine but the damn light comes on, would not enough backpressure cause this or maybe a exhaust leak. If their was a leak it wouldn't be registering unless the front sims are takin the calculations and causing it. I don't know but I am stumped and have wrote thunder racing about Q&A this problem. Maybe just a bad 02sim.

 

You know what the code is?

 

nope, don't have the tools to run that.

 

autozone will scan a code for free. when i went they said my catalytic converters were bad.. both of em!

 

That would really help out in troubleshooting.

 

I just don't understand, they were not on before and I put the sims in and nothing happened, go get them cut and the damn thin comes on as soon as I start it up. just not sure.