How to Deal with Vehicle Annual Inspection Failing Emission Standards?

[RoseLee]

The solutions for failing the emission test during annual inspection are: If CO, HC, and NO are all exceeding the standards, it indicates that the vehicle's three-way catalytic converter and oxygen sensor are malfunctioning. In this case, the three-way catalytic converter and oxygen sensor should be cleaned, and if necessary, they can be directly replaced. If only CO and HC exceed the standards, it is generally due to a malfunction in the vehicle's intake system, along with carbon buildup in the cylinders. In this situation, it is necessary to promptly clean the engine carbon deposits and the vehicle's intake system. If only CO exceeds the standards, it is usually caused by incomplete combustion of fuel and the air-fuel mixture in the engine cylinders. In this case, the air filter and spark plugs should be inspected and cleaned in a timely manner, and if necessary, they can be directly replaced. If CO and HC exceed the standards, and the vehicle emits a large amount of black smoke upon starting: This is generally due to severe wear of the engine cylinders, requiring the replacement of components such as piston rings and cylinder heads. The purpose of the annual inspection is to: Check whether the engine, chassis, body, and auxiliary equipment are clean, intact, and functional, whether the vehicle's paint is symmetrical and aesthetically pleasing, whether major general processes have been replaced, and whether they match the initial inspection records. Check whether the vehicle's braking performance, steering maneuverability, lighting, exhaust pipes, and other safety factors comply with the requirements of the "Technical Conditions for Safe Operation of Motor Vehicles." Check whether the vehicle has been modified, altered, or transformed, whether all records such as the vehicle license, license plate, and vehicle file match the current condition of the vehicle, whether there have been any changes, and whether the necessary approval, alteration, or modification procedures have been applied for. Check whether the license plate printed on the vehicle, the vehicle license, and the enlarged license plate characters are damaged or illegible, and whether they need to be replaced.