what is the function of heater sensor in 2005 highlander model and location

Question

what is the function of heater sensor and where is it located in 2005 model of toyota highlander. can it be responsible for increased fuel consumption

Answer 1

are you talking about oxygen sensor (sensor 2) or air to fuel ratio sensor (sensor 1)?

sensor 1 detects the air to fuel fuel ratio and it is adjust if you need more fuel or less.

sensor 2 detects is the catalytic converter is working properly