Jacob.P93

What is the purpose of the read 02' sensors?

F-ReV

To make sure the cats are properly working. The front ones test the emissions first and the rears check the emissions as the come out of the cat to make sure they're removing what they're supposed to.

BrowningSCrew

^yep you can trick them and cut off the cats though.

Jacob.P93

Can I trick them by pulling them completely off? What would happen if I pulled them out an left them out? Or disconnected them?

BrowningSCrew

You'll throw a code

BrowningSCrew

You'll have to do the Gott's o2 mod

https://www.f150forum.com/f6/go-catl...or-mod-195581/

Jacob.P93

But is that it? If I have a tuner that cancels that I won't have to worry about running lean or anything? The reason I'm asking is cause I had a guy cut my back two cats off and he did a hack job and cut them to close to the sensor for me to fix it so I was thinking of cutting it off right behind the sensor and fixing it. What are your thoughts?

BrowningSCrew

If you do this it won't ever throw a code and you won't even have to tune it. How did he cut it too close?

Jacob.P93

Where he cut it there is no room to even butt weld the pipe. Bastard!

BrowningSCrew

How's it connected then?