1999 Volvo S80 2.9L with code P1111

Question

My car is a 1999 volvo s80 and the code P1111 came out . It reads O2 control (bank 1) too lean I have checked online but it shows something else and not the O2. I would like to know exactly what it is and if it's a O2 sensor how do I find out exactly which 4 sensors I need to replace.

Answer 1

P1111 Outer temperature sensor

This is for the outer temperature sensor, this monitor the outside temperature in comparision to the IAT (intake air temperature)