2003 Toyota Solara Q&A

2003 Toyota Solara Question: Which O2 Sensor is the B2, S1. And is it upstream or downstream?

Toyota diagnosis as to the reason my check engine light is on. B2-S1 O2 Sensor is bad.. -
Answer 1
that would be an upstream, sensor is located in or near the exhaust manifold, would be a better option to replace both bank 1 and bank 2 sensors at same time.. -
Comment 1
Thank you, I will follow your advice to replace both sensors.. -
Answer 2
bank 2 is the side closest to the front of the car.sensor 1 is the upstream or pre-cat. -
Comment 1
Thank you for the information and your time .. -