Catalytic converter

The effectiveness of the catalyst is shown in its ability to oxidize carbon monoxide and hydrocarbons (CH). The engine control unit compares the signals of the front and rear oxygen sensors to determine when the signal voltage is adjustable oxygen sensor begins to coincide with the front of the sensor voltage signal. As the wear of the catalytic converter waveform rear oxygen sensor begins to match the waveform of the front sensor, since converter becomes saturated with oxygen and with the same efficiency unable to utilize oxygen for the oxidation of hydrocarbons and carbon monoxide into water and carbon dioxide. When completely worn converter signals front and rear oxygen sensor coincide.