What are the full dimensions of the Audi A3?

What Does Excessive Emissions Mean?

Introduction to the Causes of Excessive Vehicle Emissions: Vehicle Aging: If the vehicle's mileage has exceeded 450,000 kilometers or it has been in use for more than 15 years, various components of the car will show significant signs of aging, poor contact, poor sealing, and insufficient pressure. Failure of the Three-Way Catalytic Converter: The failure of the three-way catalytic converter is the primary cause of excessive vehicle emissions. The three-way catalytic converter, installed as the most important external purification device in the vehicle's exhaust system, converts harmful gases such as CO, HC, and NOx emitted from the vehicle's exhaust into harmless carbon dioxide, water, and nitrogen through oxidation and reduction reactions. When high-temperature exhaust gases pass through the purification device, the catalyst in the three-way catalytic converter enhances the activity of CO, HC, and NOx, promoting specific oxidation-reduction chemical reactions. CO oxidizes at high temperatures into colorless, non-toxic CO2 gas; HC compounds oxidize into water (H2O) and CO2; and NOx reduces into nitrogen and oxygen. These three harmful gases are transformed into harmless gases, thereby purifying the vehicle's exhaust. Abnormal Engine Operation: The engine may experience issues such as misfiring, spark plug oil leakage, or oil blow-by. When the throttle is increased, the engine does not run smoothly and powerfully.

8

2

Share

Is there a fee for vehicle inspection re-examination?

There is a fee for vehicle inspection re-examination. The annual vehicle inspection includes several testing items. If any item fails, the corresponding item will require a certain debugging fee and re-inspection fee before it can be tested again. However, failed items generally get one re-examination opportunity. If they still fail, the vehicle owner must take the car to a repair shop for maintenance and then pay again for re-inspection. Emission Test: The emission test is the first item in the annual inspection, mainly checking whether the vehicle's exhaust emissions of harmful gases and substances such as hydrocarbons and PM particles meet the standards. Violation Check: This primarily verifies whether the vehicle owner has any unresolved traffic violations. If there are no violations, the staff will stamp the documents, and the inspection can proceed. Otherwise, the owner must resolve the violations before returning for the annual inspection. Exterior Inspection: This mainly checks for damage to lights and glass, changes to the suspension, and the condition of the sunroof, body, tires, and other exterior parts. On-Road Test: The on-road test is essentially the final inspection item, primarily assessing the vehicle's braking performance, lighting system, horn, chassis, and other components.

17

1

Share

What Causes the Noise After Replacing the Three-Way Catalytic Converter?

After replacing the three-way catalytic converter, the noise in the car may be caused by a cracked shell or a damaged filter. Cracked Shell: Visit a repair shop to have a technician perform welding. It is not recommended for car owners to remove the three-way catalytic converter themselves, as this involves disassembling the oxygen sensor, which requires certain technical skills. Damaged Filter: Replace it again. Lifespan of the Three-Way Catalytic Converter: The service life of a three-way catalytic converter ranges between 80,000 to 100,000 kilometers. The specific lifespan depends on the vehicle's usage conditions, as well as the quality of the fuel used and the driving environment. Composition of the Three-Way Catalytic Converter: The three-way catalytic converter generally consists of four parts: the shell, damping layer, substrate, and catalyst coating. The shell is made of stainless steel to prevent oxide scale from falling off, which could clog the substrate. The damping layer is composed of gaskets or wire mesh pads, serving to seal, insulate, and secure the substrate. To protect the substrate from damage caused by vibration, thermal deformation, and other factors, the gasket is made of expanded mica and aluminum silicate fibers, bonded with adhesive. The substrate is made of honeycomb-shaped ceramic materials, though many also use metal (including stainless steel) materials. The catalyst consists of precious metals such as platinum, rhodium, and palladium, sprayed onto the substrate to form the purifying agent.

13

0

Share

Is the Audi Q8 an imported car?

Audi Q8 is an imported car, serving as the brand's new flagship model. The production platform for the Audi Q8 is the MLBevo platform, which it shares with the Lamborghini Urus and Bentley Bentayga. The Audi Q8 measures 4986mm in length, 1995mm in width, and 1704mm in height, with a wheelbase of 2995mm, complying with China's National VI emission standards. Developed over three years by Audi, the Q8 is a mid-to-large-sized SUV that emphasizes comfort, seamlessly integrating sportiness, functionality, high technology, and luxury quality.

17

0

Share

Can water be added to a car's coolant?

Water should not be added to a car's coolant. Reasons why water should not be added: Typically, the freezing point of coolant is around -25°C. After adding water, the new coolant's freezing point rises to approximately -10°C, which can cause the coolant to freeze, severely damaging the radiator or cooling system. Additionally, the proportion of anti-corrosion additives in the coolant will become imbalanced, reducing its anti-corrosion functionality. Introduction to coolant: Automotive coolant is a medium that protects the car's engine. It primarily serves two purposes: one is to cool the engine during operation, and the other is to prevent the cooling system from freezing in low winter temperatures.

11

1

Share

How to make the horn sound when locking the Volkswagen Lavida?

Volkswagen Lavida's horn setting for locking cannot be manually configured. It is recommended to visit a 4S shop or auto repair shop for computer setup. Here is relevant content introduction: 1. The horn serves as the vehicle's audio signal device, functioning to warn pedestrians and alert other vehicles, ensuring traffic safety while also being used for urging movement and transmitting signals. 2. In terms of exterior design, the Volkswagen Lavida features a multi-horizontal bar grille integrated with headlights, adopting LED light source headlights. Instead of a closed grille, the horizontal bars are treated with white painting.

7

2

Share

What are the full dimensions of the Audi A3?

What Does Excessive Emissions Mean?

Is there a fee for vehicle inspection re-examination?

What Causes the Noise After Replacing the Three-Way Catalytic Converter?

Is the Audi Q8 an imported car?

Can water be added to a car's coolant?

How to make the horn sound when locking the Volkswagen Lavida?

What is a compact car?

Is it serious not to pay roadside parking fees with temporary license plates?

What is the speed limit at urban traffic lights?

What is the WYE car?