O2 Sensor location on 2008 Toyota Solara V6 - 2008 Toyota Camry Solara

Question edited for clarity.
Question moved to model category.

There are 4. They are before and after the catalytic converter, two are screwed into each bank exhaust manifold and two in each of the aft flanges of the Cats.

https://www.google.com/search?q=2005+Toyota+Camry+V6+O2+sensor+diagram

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the thermostat is on the drivers side, right above the starter, follow the lower radiator hose to where it connects to metal pipe, there is one bolt holding it to the engine, near the oil fill up, unbolt it and pull it from the thermostat housing, 3 bolts hold the housing to the engine, remove the top of airbox and hose and move out of the way, the sensor is one of the two electrical connectors you have to disconnect

https://fuse-box.info/toyota/toyota-solara-2004-2008-fuses

Toyota Camry How to Replace Knock Sensor

my son's solara which has same engine has three. two before cat and one after.

Your O2 sensor is part of your engine management system and helps the main computer decide on the correct fuel/air mixture for the current driving conditions. They often go bad way earlier than 120 K miles. The check engine light is the cars way of telling you a number of things are bad. You can easily replace the O2 sensor your self. It is located in the lower part of the exhaust manifold. It looks like a sparkplug with a thin wire on it. Simply disconnect the wire from the engine connection, unscrew the O2 sensor and replace it with a new one (about $85-110) at your local auto parts store. Hope this helps.

Dan

Have you tried cam or crank position sensors? These will cause issues like these as well.

There is a video in the link

https://www.google.com/search?q=fuel+filter+located+on+a+1999+toyota+solara+sle+v6

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B1S1 means first (upstream) , closest sensor to cyl. head , usualy at exhaust manifold.Bank 1 is cyl. head with cyl.#1 if you have V6 engine.
Best choice for brand - Denso.

both these sensors are located before the catalytic converter,sometimes in the exhaust manifold. are you sure that's the problem. Usually they both don't go at the same time. Are they running rich or lean, get back to me and we'll go from there Thanks Ray