3 different code?!?

I just bought my TL 2 weeks ago,and on my way home from work lastnight tye engine light come.today i went to get the scanned & it read 3 different code

P0420

86-1

61-0
The car has 130k,i know the guy from the dealer said it's going to need a battery too.And to top it off i acciedently filled up the tank with 87 octane...if anyone can help me out thanks