Looking for opinions, I have an issue where the check engine light is
coming on. I recently gave the car a tuneup which cleared the misfire
codes it had, but now (1 week later), I have the following codes
present:

P1128 Long Term fuel trim too lean
P0172 System Too Rich
P0134 Oxygen Sensor Circuit - no activity detected (pre-converter
sensor)

I am guessing that the O2 sensor needs to be replaced, but will this
also fix the other codes? I haven't detected any vacuum leaks that
might be suspect. Any help would be appreciated. Thanks.