What to Do If the Vehicle Fails the Environmental Inspection?

1 Answers
MacLawson
07/30/25 6:57am
It might be an issue with the catalytic converter. Here are some relevant details about the catalytic converter: 1. Principle of the Catalytic Converter: Vehicle exhaust contains many pollutants, with the most significant being carbon monoxide, hydrocarbons, and nitrogen oxides. Normally, after oxidation and reduction processes, the catalytic converter converts these into harmless carbon dioxide, nitrogen, and water, achieving purification. The catalytic converter is called a "three-way" converter because it contains three precious metals: platinum (Pt), rhodium (Rh), and palladium (Pd), hence the name "three-way." 2. Solution: Before the inspection, drive on the highway for a while to bring the catalytic converter up to its operating temperature before testing. The most important point is not to turn off the engine before the inspection to keep the catalytic converter at a certain temperature. If it still fails, directly clean the catalytic converter and then retest to see if it passes.
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