What if the car is not environmentally friendly?

1 The vehicle is environmentally friendly for three times, and the vehicle is environmentally friendly for three times. However, first consider whether there is a problem with three-way catalysis. There are many pollutants in automobile exhaust, the most important of which are carbon monoxide, hydrocarbons and nitrogen oxides. Generally speaking, after redox treatment, three-way catalysis will generate carbon dioxide, nitrogen and water that are harmless to the atmosphere, thus achieving the purification effect. So it is called three-way catalysis. Because it contains platinum (Pt), rhodium (Rh) and palladium (Pd), it is called "three-way catalysis". Solution: Run a section of high speed before vehicle inspection, so that the three-way catalyst in the vehicle can reach the catalytic temperature before vehicle inspection. The most important thing is not to turn off the engine before inspection, which is to keep the three-way catalyst at a certain temperature. If it still doesn't work, clean the three-way catalytic converter directly, and then retest to see if it can pass. If it still fails, consider the following reasons: 1. There is something wrong with the oxygen sensor. Solution: Replace the oxygen sensor. 2. There is something wrong with the air filter. Solution: Replace the air filter element. 3. The reason of gasoline. Solution: Add half a box of e 10 ethanol gasoline. Ethanol has high oxygen content and supports combustion. All the above methods have been tried, and there is basically no way.