toyota camry 2007 where is this sensor located

Question

where is the H02S Heater control circuit low B1/S1 located in the 2007 toyota camry 3.5L? I was told this code is an A/F ratio sensor. What is the difference?

Answer 1

Bank 1 sensor 1 is the A/F ratio sensor and it will be near the fire wall on the exhuast manifold (see picture B1,S1)

 A/F ratio sensor is on the exhuast manifold and oxygen sensor is after the catalytic converter