Any tips on picking o2 sensors? I looked on rockauto.com and there are about a dozen or more to choose from ranging from about $23 to $160. I usually try to buy parts made by Japanese OEM suppliers for my Toyotas. I see that rock has Denso brand o2 sensors for about $44, part# 2344162, which is the same part that Autozone sells for $100. I'm also getting conflicting info on whether I need different sensors for the front and the back positions. Autozone says I need part # 2344161 for the front, and 2344162 for the rear. Rock says use 2344162 for both. Then Bosch and NTK complicate matters even further by using the terms "bank 1 sensor 2" and "bank 1, sensor 1", indicating different sensors for the different positions.
BTW I am going to consult with my local muffler guru and see if he can weld new flanges on to my pipes at both locations so I have a good base and fresh studs to install my new o2 sensors. Randy's Performance Muffler, in Lake Geneva, Wisconsin, is a gift to our community. He has extremely reasonable prices and does excellent work. And he's swamped. You have to get on his waiting list to get in.