p0420

I'm at a loss on what to do next to fix my daughter's 1997 Jeep TJ 2.5L. I keep getting a recurring P0420 code. I’ve already replaced the upstream O2 sensor with a new NGK 23179. During the process, the male portion of the O2 connector came apart, but I managed to get it back together. I’m not...

Not sure where to put this thread but my girlfriend recently got an Fj because she couldn't afford a JK. lol, I know that's not the answer. I tried to convince her to get a TJ but she says they're too old. Anyway, the Fj forum is crap so I'm going to ask here. I'm getting 3 codes. A P0420...

Hi all, I've been forced to get my catalytic converter fixed because I'm moving to a state with emissions testing. I've had the P0420 code for over 5 years now. Recently, I had a dealer install a new converter, but the code is still present. I think this is because the converter the dealer put...