A/F Sensor Description: Notes

A/F sensor (1), in place of the conventional heated Oxygen sensor-1, is installed in the exhaust manifold (bank 1 and bank 2) and it consists of a zirconia element (2) which causes the output current to vary according to difference in the oxygen concentration, a heater (3) which activates the element.

A/F sensor detects oxygen concentration in exhaust gas (8) (A/F ratio of the air-fuel mixture) linearly, ranging from LEAN to RICH.