Is it necessary to call Langdong Sanbao 4s three-way catalytic purification?

It's not necessary. Under normal circumstances, there is no need to wash.

Three-way blockage leads to weak acceleration, and three-way poisoning leads to excessive exhaust gas. The working principle of the three-way catalytic converter is that when the high-temperature automobile exhaust gas passes through the purification device, the purifying agent in the three-way catalytic converter will enhance the activity of three gases, namely co, hc and nox, and urge them to carry out certain redox chemical reactions, wherein co is oxidized into colorless and nontoxic carbon dioxide gas at high temperature; Hc compounds are oxidized to water (H2O) and carbon dioxide at high temperature; Nox is reduced to nitrogen and oxygen. Three kinds of harmful gases are changed into harmless gases, thus purifying automobile exhaust.