Repair exhaust leak at downstream oxygen sensor (o2S) what does this mean?

What is your question?

Just bought yesterday, traded my 2010 Pontiac G6 GT for. Am currently financing Buick. Car has been fine since yesterday out of nowhere my check engine light came on, took to Auto zone and those are the codes that were pulled up. The only thing I really noticed when driving was while on interstate 70-80mph I noticed my car felt kind of wobbly if that makes sense. When light first came on I got a quick smell of something burning and noticed the lights on my radio went dim then brightened up. Not sure how car is supposed to sound but kind of sounded really loud to me anyway. Not sure what's normal as I am still learning this car. Shifting seemed normal. Took to Auto Zone and got 1 code for Power train system and 5 codes under anti-lock brake system. control module power circuit, lost comm. with body pump motor circuit to yaw rate signal, control module comm. bus A off and yaw rate signal not plausible.

How long has your 2010 Buick LaCrosse had this problem?

Just bought yesterday, engine light lit up this morning