Oxygen Sensor

Mounted in the exhaust manifold, the oxygen (O2) sensor used in DFI system is a closed-end Zirconia sensor placed in exhaust gas stream. This sensor generates a very weak voltage which varies with oxygen content of exhaust gases.

As oxygen content of exhaust gases increases, a leaner mixture is indicated by low voltage output. As oxygen content decreases, a richer mixture is indicated by higher voltage output. The ECM corrects air/fuel ratio according to signals received from oxygen sensor.