So I've had my truck for over a year now and just got a P0420 like a month ago. Got a buddy and some beers and decided to chop it off and see if I couldn't just gut it, but when I got it off the ****er was empty. Why did I just get the code now and will there be any issues if I don't replace it?

 

The sensor may need a non fouler but no the code doesn't affect ATF ratio that's the front one. So you could leave it

 

appreciate it, was really hoping it wasn't anything bad

 

Yeah it's not bad a cheap way to check is some people had luck just putting the sensor on the frame

 

I had the same code when I deleted my cat, mine was plugged up solid. I welded up a straight pipe 3in delete pipe (I even cut out and weld in the old O2 sensor bung). I got two Dorman 42009 Spark Plug Non-Foulers (they will thread into the O2 bung) and some stainless wool, no more code.

You Tube

 

Hell yea appreciate it, was tired of looking at that dam light