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

Toyota diagnosis as to the reason my check engine light is on. B2-S1 O2 Sensor is bad..
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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..
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