Toyota diagnosis as to the reason my check engine light is on. B2-S1 O2 Sensor is bad..
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2003 Toyota Solara Question: Which O2 Sensor is the B2, S1. And is it upstream or downstream?
Answer #1Tbone1980 September 15, 2013, 06:09Journeyman
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..
ReplyBigroadhog, September 15, 2013, 06:12Rookie
Thank you, I will follow your advice to replace both sensors..
ReplyTbone1980, September 15, 2013, 07:42Journeyman
Answer #2joelburke26 from Joels Auto Service, September 15, 2013, 06:14Master
bank 2 is the side closest to the front of the car.sensor 1 is the upstream or pre-cat.
ReplyBigroadhog, September 15, 2013, 06:17Rookie
Thank you for the information and your time ..