O2 sensor voltage

[FrontierTails]

CEL P0420 code
100k miles

Replaced the downstream passenger side sensor, no change.

Looked at the live data and it makes me wonder if I replaced a bad sensor with another bad sensor?

I didn’t look at live data with the old sensor, so I don’t know for sure.

Oem cat on the way if it turns out to be that.

 

[Cimmerian]

It's probably the cat, mine crapped out at 120k miles. Instead of replacing, I just put on two extenders and the codes went away. Jeep still drives perfect with no MPG loss.

 

[FrontierTails]

It's probably the cat, mine crapped out at 120k miles. Instead of replacing, I just put on two extenders and the codes went away. Jeep still drives perfect with no MPG loss.

I was looking for those extenders, do you happen to have a link to what you used?

 

[Cimmerian]

I was looking for those extenders, do you happen to have a link to what you used?

Just look on Walmart's website for O2 extenders or defoulers. It's against the rules to actually link to that stuff here because of Federal emissions laws.