Hello all,

I recently had the PO155 come up. Took the car to autozone and it came up as a o2 sensor. Looks like there was a history of it 2x.

Can this be a sensors going bad or perhaps another related item. Anyone else have this code come up. If yes did replacing the sensor solve the issue.

Car has been driving fine, cannot tell any differences in performance. So should I change it out to resolve any future issues. Also should I change both banks.

Thanks in advance.