I have a flowmaster exhaust on now and I want to take the cats off. The exhaust system is cat back right now and it is true duals. My question is what about the rear sensors the ones behind the cats what should I do with them I'm not to worried about the front ones I will just screw them back in the pipe since they are in front of the cats. But ones behind the cats monitor the cats. So what to do?

Thanks

 

jrboop,

All you need is an O2 Simulator.

Casperelectronics makes them :
http://www.casperselectronics.com/cg...i?product=FORD

I am guessing my the description that is is a 98 or newer truck, with 4 Cats and 4 O2 sensors, so you would need a pair of these ( one for each side ).

This will stop the CEL from lighting due to the second set of O2 sensors not seeing the cats working correctly.

I thought these were inline connectors, so you actually need to reinstall the bung for the rear O2 sensors and plug this inline, I could be wrong I don't use them.
or maybe they can be just plugged in, and cap off the side that normally plugs into the O2 sensor ??? ( SWAG on that )

Maybe there is another manufacture that has a terminated end on it that I don't know about.

Steve

 

It is a 97 F-150 and it has 2 cats one on each side. There are four O2 sensors one in front and one behind on each side.

Thanks for the info and the web address.