O2 sensor replacement 2003 verso glx

[rae Houghton]

Under manifold cover Are 2 sensors. , Left and right.

Below are 2 sensers left and right.  Are the bottom ones post catalytic converter? And above pre?

I note cost differentiates between two. Just trying to figure what to order thanks 

[TonyHSD]

Hi, 

there might be bank 1 and bank 2 sensors and each to have pre and post catalytic converter so total 4 

You will need to check your engine type and number of sensors. Here on this website you can find your car and locate parts and numbers. https://japancars.ru/index.php?route=catalog/toyota
Good luck