What should I do if the car is unqualified for environmental protection?

There are many reasons why the audited vehicles do not meet the environmental protection standards, mainly CO, HC, NO, etc. The specific waste gas exceeding the standard and the solutions are as follows:

1. Carbon monoxide, hydrocarbons and nitric oxide all exceed the standard:

If CO, HC and NO all exceed the standard, it means that the three-way catalyst and oxygen sensor of the automobile are out of order. In this case, the three-way catalytic converter and oxygen sensor of the automobile should be cleaned and replaced directly if necessary.

2. Carbon monoxide and hydrocarbons exceed the standard:

If only CO and HC exceed the standard, it is generally a fault of the automobile intake system, and carbon deposition will also occur in the cylinder. In this case, the carbon deposits in the automobile engine and air intake system should be cleaned up in time.

3. Only carbon monoxide exceeds the standard:

If only CO exceeds the standard, it is usually caused by insufficient combustion of fuel and mixture in the engine cylinder. In this case, check the air filter and spark plug, clean them in time, and replace them directly if necessary.

4. Carbon monoxide and hydrocarbons exceed the standard, and a large amount of black smoke is emitted when the car starts;

This situation is generally caused by the serious wear of the engine cylinder, and it is necessary to replace the piston ring, cylinder head and other components at this time.

Several methods to avoid excessive automobile exhaust;

1. Clean the engine carbon deposit on time.

2. Try to add high-quality fuel.

3. Replace high-quality fuel injectors and spark plugs.