Sensor Problems??

I Have An Avalon With 98.000 Miles A 1999. It Has Had To Have Two Sensors Replace And O2 And A Fuel And Air Ratio Sensor Both Are Abot $500. Each. Toyota Says Hond And Nissan Would Have Similar Problems. Do You Agree Or Is Nissan Without These Expensive Problems???
Please Advise, I Am Ready To Switch But Do Not Want To Go From Bad To Worse....
Jim