I've been searching for a couple of days to find the denso part number for bank1 sensor2 for my 2011 Rav4. I can find no cross reference anywhere. Denso specifies downstream left or downstream right. I found an exploded view of my V6 engine but can't tell if my sensor is left or right. It seems to be in the center of the vehicle in the exhaust pipe. So show me in writing somewhere on the net how to determine whether to purchase downstream left or downstream right Denso sensor.