I recently got my o2 sensors replaced. I replaced bank 1 sensor 1 and 2, bank 2 sensor 1. They was pretty easy. Bank 2 sensor 2 was hard as it the seized to the exhaust. I disconnected the battery for the first 3 and then on the seizures one, I connected the battery so I could heat up the exhaust and sprayed pb blaster on it and tried to take it off with no prevail. When I used the o2 offset to spin the b2s2 sensor, the car stalled out while it was still running. So I took it to a muffler shop to change the last sensor. And now the check engine light won’t go out even though all of them is replaced. When starting the car it starts then goes right back off. The second start it starts fine but while driving it is hesitating in 3rd gear. I know it’s not the tranny but when I try to clear the codes I get codes for all the o2 sensors. My question have anyone else have this issue with their is250? Is there a fuse I should check?

 

What brand of O2 sensors did you use?
When I replaced my sensor the light stayed on for next 2 days and then it cleared itself.

 

I replaced them with all Denso o2 sensors

 

I disconnected the battery and took out the electric throttle body sensor fuse and still the car is dragging in 3rd gear before going into 4th and still have a check engine light. Who knew o2 sensors can be such a nightmare lol