It has been a few years since I have had to buy a set, and it seems like nobody makes them anymore. All I found were the ones where you can splice into your own O2 harness or create your own with Radio Shack resistors.

I don't want to do any splicing, I just want an O2 Simulator that plugs in line with my O2 sensor.

I found some for Fords, but nothing for GM's

 

The popular thing to do now is to use 18mm spark plug non foulers, drill out the end of it, then screw your O2 into it. This will space the O2 out of the exhaust stream and the result is what the computer believes to be a normally functioning catalytic converter.

You can find them in most any autoparts store for about 5 bucks for 2, made by the Help! brand.

 

I was planning on getting the spark plug non-foulers today, but I was unsure about how well they would work with non-catted test pipes.

 

You could have them tuned out, if you planned on getting your car tuned anytime.

 

I wont be getting the car tuned yet, so I wanted this to hold me over. I have turned off the rear O2's with a tune on my last car, but I still used mil eliminators. Sometimes I like to switch back to the stock tune, and would need MIL eliminators to keep the light from coming on when I switch the car back to stock.

 

well i cant speak for your results on your Caddy, on my Evo I have had this set up for 3 years and not _one_ single SES light for catalyst. I was skeptical of this fix before I tried it but it works as advertised

 

cruizinconcepts.com

 

Did you use two non-foulers per O2 sensor or just one? I saw one link recommending one non-fouler drilled out to 1/2in, and another link where you put the drilled one in a non drilled one.

 

I just used one of them, drilled out the bottom of it, that was it. I really thought there was going to be more to it, but it's just that simple.

I gave the other one to a friend, he put it on his WRX

 

Thanks. I'll try just one for now, but I have two spares just in case I need to double up nonfoulers to avoid CEL's