If you get some motivation I would swap your sensors... Move the passenger side sensor to the drivers side and vise versa... Reset the codes and see if anything changes... Just because the sensor was replaced doesn't mean its not defective...

 

Yeah I did that Then the other sensor code showed up that when I replaced the sensor then the p1273 code showed up again... Idk very confusing I don't know what else it could be

 

I feel your pain bro! I really do!! I'm in the exact same situation right now. I've had full bolt ons (stock headers) and uprev tuned for 8 months then check engine light came on 2 weeks ago pulled code p1273 same as yours. Went to install shop and tuner shop both places can't figure it out. They recommended replacing o2 sensor. Also said they're may be a possible exhaust manifold leak. Couldn't find a leak in intake or plenum. I'm about to pull the trigger on some tomei or Nismo headers and replace bank 1 sensor and re tune. Haven't decided yet if I should do it because I really don't want any rasp added to the tdx2 art pipe setup I got. Keep us informed if you find a solution.

 

I don't understand it...Unsolved mystery lol..but I will let u know if I find anything ..maybe the sensors are just very sensitive