I do believe that my rear o2 sensor along with my catalytic converter are bad in my ix mr. Now im searching for sum here on the interwebs and there are so many!! My question tho is what is the difference between these $30 o2 sensors and the $200 o2 sensors. Just curious before i make a bad buy.

 

test pipe and rear 02 simulation (physically or through flash)....youll pick up power and save money

 

now how do i do that without a speed shop around. I live in Branson, mo. and a lot of people think my bov is me 'grinding gears' just to give you a taste of what im dealing with here location wise. also would ne of those mods bring the cel on?