Just got this Jeep a few days ago and it's throwing 3 codes and was going to see if anyone else had this issue and maybe where to start. It's showing codes p0132 o2 b1s1. P0152 o2 b2s1 and p0305 cylinder 5 misfire. It's running slightly rough at idle and noticed the check engine light started flashing. Anyone else have this or know where to start

 

What I think you should do is concentrate on fixing the P0132 and the P0152.
I always kind of assume that a misfire code is really just a symptom of a deeper problem.
So figure out those 2, clear the computer, and see what happens.
Having said that a few years back had a P0304 in my '00.
Figured easiest thing first. Replaced the plug. Especially easy cause I had some in "stock". LOL.
Sure enough.
Go figure.

 

How many miles have you driven since you first got it? Pull plugs and check what they look like. Original cylinder head? Check compression. Check oil and coolant for contamination.

Yup I'm a cynic.