I have a 2007 ES350 that needs a bank 1 sensor 1 oxygen sensor. Where is this sensor located and when I call an auto parts store what do I ask for? Every place I call wants to give my a different sensor and I don't want to get the wrong one.

Not sure about the answer to your question, but the same sensor went out on my car when it had 308 miles!

LOL well that doesn't help much. So nobody knows anything about this?

Geez, how many oxygen sensors does an 07 ES have? No wonder there is confusion.

When I search for "oxygen" in the 07 ES section of toyodyi.com I found this diagram showing two: http://www.toyodiy.com/parts/p_U_2007_LEXU...1.html?hl=89465

When I search the 07 ES section of parts.com for "oxygen", I found six oxygen sensors.

Apparently the four "SENSOR, AIR FUEL RATIO" on toyodyi are shown on parts.com as oxygen sensors. 2+4=6

Wouldn't this be covered under the warranty (or emissions warranty if you are out of bumper-bumper warranty)?

More importantly, perhaps, wouldn't doing this yourself void the emissions warranty?

I am in the process of replacing one on my RX which is out of emissions warranty (waiting for the part to arrive).