Took my 2018 IS 300 to a mechanic for P013a code and had the bank 1 sensor 2 replaced. Engine light came back on after a few days of it being replaced so they replaced it again. Light goes off, but then after a few days it comes back on. Every time saying it was a P013a code. Finally they replaced the sensors on the opposite side. Engine light came back on a few days later. Has anyone experienced this? Any solutions? TIA

 

was the o2 sensor an oem one?
did your mechanic replace your exhaust gaskets?