I would replace the O2 sensor, clear the PCM of all codes (pull fuse #15 under the hood, crank over a few times, and then replace fuse) and then take a drive and see what codes come back. If no CEL comes back, then you're good to go.
Could be a ton of things causing those codes. Best to start w/ the one you know you have an issue with and go from there.
These are highly engineered precision vehicles, the first step in diagnosing the problem is to strike the suspected offending part sharply and repeatedly with a blunt object, then re-test.