2004 ls trouble codes

[cn63bug]

Hey guys. New member here. Looking for some advice. I have a 2004 LS v6 with about 180,000 miles. The car runs fine and smooth, but it won't pass emissions. Had some codes pop up a little while back that were for o2 sensors. Replaced them and they went away. Had another code for the egr p0403 that I finally got to go away (was a damaged vacuum line). After that, no more egr code, however, I have two new codes that popped up after I got all the other codes cleared. P2197 and P0420. Not sure while they didn't pop up until after I got the other part fixed. I know what that p0420 is for the bank 1 cat. The p2197 is for bank 2 sensor 1 o2 sensor. All the o2 sensors were replaced at the same time and fixed the codes I was getting. I didn't get the 403 code fixed until a few weeks later. After that, the new codes. Any ideas or help would be appreciated.
Thanks

 

[LS4me]

Hey guys. New member here. Looking for some advice. I have a 2004 LS v6 with about 180,000 miles. The car runs fine and smooth, but it won't pass emissions. Had some codes pop up a little while back that were for o2 sensors. Replaced them and they went away. Had another code for the egr p0403 that I finally got to go away (was a damaged vacuum line). After that, no more egr code, however, I have two new codes that popped up after I got all the other codes cleared. P2197 and P0420. Not sure while they didn't pop up until after I got the other part fixed. I know what that p0420 is for the bank 1 cat. The p2197 is for bank 2 sensor 1 o2 sensor. All the o2 sensors were replaced at the same time and fixed the codes I was getting. I didn't get the 403 code fixed until a few weeks later. After that, the new codes. Any ideas or help would be appreciated.
Thanks

Check the connectors and make sure they are secure.