You most likely replaced the wrong o2 sensor. The Hanes manual incorrectly state that the bank one sensor one O2 sensor is in the front. It is actually facing the firewall towards the bottom. Cylinder one faces the same direction; hence the nomenclature.
O2 sensor
The b1 s1 O2 sensor on this model is located on the firewall side of the engine. I just changed mine, I couldn't get to it when it was on a lift so I went from the top. Not easy but very doable.
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The Toyota Solara is no longer in production. It was discontinued in June 2009.
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The Camry Solara was initially called the Camry Coup© from 1994 to 1997 and it was, effectively the third generation of Camry rather than a separate model. from 1999 forward the car was renamed the Camry Solara and eventually just the Toyota Solara.
What would be the recommended miles to change out the timing belt on my 2001 Solara 4cyl. with 77,000 miles on it. Would 90K be a number close to factory recommendations?
look at where the headers come off the engine. follow this and there should be a rod like projection sticking out with wires running down from it. that is your O2 sensor.