1999 Toyota Camry - where is the oxygen sensor located - Code isPO172 (Bank 1). Fuel System Too Rich

Question

This is Code PO172 for 1999 Toyota Camry - Bank 1 System is too rich for a predetermined period of time.

Answer 1

P0172 Fuel trim rich

The 02 sensor in question is located just before the catalytic convertor, when you have a rich running condition mechanical condition  should be ruled out, such as low compression , leaking internally from the from the fuel pressure regulator. ,plugged airfilter,

 Location of the upstream 02 sensor