I have a slight rotten egg smell. Not full blown. I don't have any engine lights or anything. I have a cat back exhaust. I don't think it's my cats since I have only 59k. Is it possibly a bad O2 sensor?

 

Pretty sure that means your cats are going.

 

Do you smell it while in the Jeep? Or just when you are behind it and it's idling?

If inside the Jeep, could be the battery being over charged.

If at the back, it's probably the cat.

 

I can smell it outside the jeep but yes also in the jeep. If I put the heat to recirculate then I don't smell it. I only smell it in the winter and it's not all the time

 

Maybe just winter blend fuel..IDK..

 

Clearly the correct answer that everyone has overlooked is, you forgot to take that carton of eggs out of the jeep that you bought 2 weeks ago.

 

Im leaning towards this answer as well. have you checked under the seats for an egg or two that accidentally fell out of the carton?

 

Yes lol. Just some slight water under my carpets as usual. My cats are u see warranty for another month. But if it's not them them I have to pay the diagnostic fee. Gonna have to suck it up and see

 

Not to be critical but why at 59k could a cat be a problem. I've driven multiple high milers - like into the hundreds of thousand miles. Even owned a small fleet at one time. I live in a high winter road salt area as well. Never ever had to change a cat and only rarely any other exhaust part.
Any fuel or oil additives in this equation? Just wondering.

 

That's my thought. Nothing extra. Just usual gas 87. I've tried different octanes. I run full synthetic oil but but switch back due to oil consumption. I'm stumped