What to Do If Your Car Fails the Environmental Protection Test?
1 Answers
If your vehicle fails the environmental protection test three times, the first consideration should be whether there is an issue with the catalytic converter. Car exhaust contains many pollutants, with the primary ones being carbon monoxide, hydrocarbons, and nitrogen oxides. Under normal circumstances, the catalytic converter processes these through oxidation and reduction, converting them into harmless carbon dioxide, nitrogen, and water, thereby achieving purification. The catalytic converter is called a "three-way" catalytic converter because it contains three precious metals: platinum (Pt), rhodium (Rh), and palladium (Pd), hence the name "three-way." Solution: Before the test, drive on the highway for a while to allow the catalytic converter to reach its optimal operating temperature before testing. The most important point is not to turn off the engine before the test, as this keeps the catalytic converter at a certain temperature. If this still doesn't work, directly clean the catalytic converter and then retest to see if it passes. If it still fails, consider the following possible reasons: 1. The oxygen sensor is faulty. Solution: Replace the oxygen sensor. 2. The air filter is problematic. Solution: Replace the air filter. 3. The fuel is the issue. Solution: Add half a tank of E10 ethanol gasoline. Ethanol has a high oxygen content, which aids combustion. If none of these methods work, there is basically no other solution.
