this is what i would do if i were you.
i never seen the bottom of a 5.7 but from what i seen in the past online is that they have possibly 2 cats and 4 oxygen sensors, i may be wrong, i don’t even know what i have underneath my 3.7L anyways i feel its to early for the cat(s) to go bad for an 2006. but since you metion a dent on one of them, slighty tap that one with a small mallet, and if you here a rattling, then possibly the honeyweb inside that cat collasped.
so even tho your diagnostics of the 02 sensors says they seem ok, I would replace ALL of them,( some manufactures recommend replace o2s ever 70k miles, plus they increase gas mileage) and reset the light and keep track of how many miles its driven before the check engine light comes on( hopefully not).
From my research with Hondas and Toyotas the check engine light comes on after 50 mile after one has reset it.
So lets say the check engine light came on again..and it’s the same p0420..
I wouldn’t worry about it till 2 weeks of the smog test requirement is due.
Anyways I would call around exhaust shops and get quotes, because some shops can or are able to cut and weld the cats out and replace them with legal aftermarket cats that meet the requirement. Which is way cheaper. If you don’t find that or its way to expensive,
Then I would suggest you put a non chalant Ad on craigslist like stating that ur jeep needs to Pass smog and that you could pay up to whatever you feel is worth it (eg 150 cash). have some on put the ad in spanish for you if you don’t know spanish, or if you know a Hispanic person goto the ghetto side of town and have them goto a smog guy and tell them they have cash in hand and if they can “pass it”, just don’t go with them because once the smog guy sees you he won’t take that chance,( my friend lost his smog licensee because he was dealing with an undercover, but that’s a different story)
Anyway if that does not work, remember the 50 miles I was telling you about and to keep track of the miles to see when the check engine light turns on? Well lets say it turns on at 50, reset the light and drive it for 44 miles (this is just an example) straight to the shop your going to smog it at, if all is good after the smog dude connects the smog machine connector to the obd2 port and begins running the wheels u should be good, it will pass smog because the 44 miles is enough to set the ECM parameters and enough for the smog machine to detect the parameters, but not enough to set the engine light. Don’t show up to the smog shop with 10 miles the machine will reject that..and the smog guy will tell you it must be driven some more, and ur time will be wasted. Or smog guy will force the run and tell you it didn’t pass…and there goes ur 1st chance. hopfullly ur jeep is properly tuned-up and a recent oil change made so it can pass the compound tailpipe test
Well good luck
Ps I forgot to mention I believe in CA, Cats have a 10 year manufacture warranty, u might want to check it out, I don’t know all the fac. I live in SO CAL and I know the struggle too well.
Last edited by gover805; 08-31-2014 at 03:52 AM.