sensors lots of trouble
 

my trouble started with cel just cleared code and it would run fine even with lite on for monthes...then it would run rough 3 cyls shut down ,cleared codes and it would run fine for weeks, then same scanner said it was bank 2 sensor 2, changed it still not working good after cel lite comes on again scan tool says bank 2 sensor 1 ...changed it and worked good for a day and cel on again it wants sensor bank 2 sensor 2 changed it again after a few weeks and still throwing codes now bank 1 sensor 2...iam wondering if the computer is gone nuts and can i erase it and ... i have since bought my own scanner and keep it in the car to make sure i can get home ... any help on this is certainly appreciated