Air-Fuel Ratio (A/F) Sensor

Air fuel ratio (A/F) sensor is installed on the upstream of catalyst converter. A/F sensor measures the oxygen level in the exhaust gas and converts it into a voltage signal. A/F sensor transmits the signal to ECM. Based on the signal from A/F sensor, ECM calculates the air fuel mixture ratio.

Courtesy of NISSAN NORTH AMERICA, INC.

A heater is integrated in A/F sensor to ensure the required operating temperature.