Oxygen (O2) Sensor(s)

O2 sensor is a heat-type sensor which measures oxygen content of exhaust gases. MPI ECM uses data from O2 sensor(s) to determine air/fuel mixture. Sensors are positioned in exhaust system, ahead of catalytic converter.

Fuel/air mixture is regulated separately for right and left cylinder banks. Each cylinder bank has its own oxygen sensor and catalytic converter. Using 2 oxygen sensors allows MPI ECM to monitor oxygen content in each cylinder bank individually.

The MPI ECM regulates the amount of fuel injected per cylinder bank based on voltage signals received from the respective oxygen sensors.