Exhaust system catalytic converter — general information (Nissan Primera P10)

A few words should be said about the installed catalyst.

The oxygen sensor is inserted into the exhaust system (on an injection engine) or into the exhaust manifold (on a carburetor engine). The outer electrode of the sensor is exposed to exhaust gases. The inner electrode is connected to the atmosphere. Due to certain chemical reactions, the probe filling and the different oxygen content in the exhaust gases and atmosphere generate an electrical signal. At a temperature of over 300°C, the probe transmits a voltage signal to the control unit. If the voltage is less than 450 mV, the mixture is enriched; if the voltage is greater than 450 mV, the mixture is depleted.

To maintain a constant temperature, the probe is heated. The probe's heating element is supplied with electric current and remains energized as long as the fuel pump is running.

The catalytic converter is located in the exhaust system before the mufflers. The exhaust gases flow through the catalytic converter and interact with the precious metal inside the catalytic converter (platinum/rhodium). Under the influence of oxidation, harmful substances are converted into a harmless gas. The chemical reaction begins at a temperature of 250°C.

As you know, a car with a catalytic converter should be fueled only with unleaded gasoline (normal or super, i.e. AI95 or AI98).

The text was borrowed from here nissanbook.ru

Do not park a vehicle with a hot catalytic converter over dry grass or anything similar, as the underbody may ignite and cause a fire.