Highwayman
Newbie
My Tahoe has the 4 oxygen sensor setup before and after the cats. On an off-road truck with no cats, anyway to reduce that number and still send the proper signals.
Too many Oxygen sensors!
- Thread starter Highwayman
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stutaeng
I'm Awesome
Do you have a picture of your setup?
sntrym
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you have 1 before and 1 after the cat on each side for 4. you can have the 2 rear O2 sensors programmed out but you will need to front two for the computer
b454rat
I'm Awesome
I got a Jegs offroad intermediate pipe for my Tahoe and Yukon. No cats, and no check engine light for the Yukon. I think it has a tune or something in it. But the Tahoe, would set it off all the time. I would clear it in the morning, by the time I got to work, mostly highway, it would come back on. I put anti foulers on each bank after cats, two actually, and now the light doesn't come on.
As mentioned, the 2 front 02 sensors adjust fuel trim. The 2 rear 02 sensors, basically let the ECM know the cats are working by comparing the 02 level before and after the cats. Yes this can be tuned out, also there are simulators that can be installed. There are 2 types. One is done with an electrical resistors and other electronic parts. Youtube has videos on making them. And there is a simulator made from 4 spark plug nin fouler spacers with a little piece of the honey comb material that is inside of the cat it self. You have to cut and grind the honey comb to fit inside of the non fouler. Use a mask when grinding, along with eye protection. I made a set of the simulators when I gutted my cats with that material from the cats and the spark plug spacers. They have been on my truck for several years, never a CEL. It works better with 2 different size non foulers. The longer one goes closest to the cat with the honey comb inside. Here are a few pics of mine.
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b454rat
I'm Awesome
Believe mine is empty, no cat material..
Sometimes that works, but it didnt for me.
Last edited:
No.
But you can violate Federal law in order to send improper signals that may fool the computer.
Different laws apply to off road vehicles. If you look at the OP first thread, He states that the truck is an off road vehicle.
"Off-Road" makes NO difference to the EPA. NONE. Not even "racing vehicles" made from production cars are exempt.
Any Federal agent you might ******** can make your life miserable over emissions violations.
The likelyhood of that happening is low, but possible.
Any Federal agent you might ******** can make your life miserable over emissions violations.
The likelyhood of that happening is low, but possible.
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