The oxygen concentration sensor (heated)

The engine control unit uses the signals of the oxygen sensor to regulate the composition of the fuel-air mixture explicitly ensuring optimum fuel efficiency and reduced emissions. For information about the content of oxygen in the exhaust gases flowing from the front oxygen sensor, to determine the degree of enrichment or depletion of the air-fuel mixture supplied to the engine cylinders. By signals from the rear oxygen sensor is determined by the efficiency of the catalytic converter exhaust gases. The computer calculates the neutralizer effectiveness by comparing the signal from the rear oxygen sensor with a signal from the front sensor.

Normal oxygen sensor signal voltage is constantly changing around the value of 500 mV, and the frequency of the signal of the front sensor is not less than 5 Hz at 2500 ^min -1. As a result of the catalytic converter frequency rear oxygen sensor signal is lower than the frequency of the signal of the front oxygen sensor. If the frequency of the signal of the oxygen sensor adjustable over a large period of time equal to the frequency of the signal of the front oxygen sensor, this indicates a decrease in efficiency of the catalytic converter or a power failure of the engine.