Changed out the exhaust which of course required switching the o2 sensor over and now the check engine light is on. Is there an easy way to confirm it's the oxygen sensor?
This is correct. I have used my DynoJet PVCX and it has helped tremendously. Make sure to clear codes often, not doing so could trick the user into falsely thinking that there is an issue (when the check engine light is on).If you have a PVCX or PV3 you can use that to read error codes.