Last night driving I got the dreaded p0420 code on my 16 Jeep compass. Things that make me think it eventually needs to be replaced: -i drove it for over an hour afterwards including on some hills, up to 5k rpm, up to 70mph no obvious signs of weak power etc, no obviously loud rattle -it had some misfires and spark plugs that went too long getting changed about a year ago so I probably shortened it’s life

On the other hand, it did occur right after a stretch of road with a lot of high frequency vibrations (lane construction that put those warning strips that shake your car into the lanes themselves) ivw read that could physically knock stuff loose inside the converter theoretically

I have a 15 hour drive back home on Sunday, my code reader is at home (I’m ordering a new one see if I can get it tomorrow so can watch the O2 levels live) , it’s my birthday and I’d much rather wait til I was back at my own mechanic (and my next paycheck) to go poking around into a bigger problem.

Thoughts?