How Many Kilometers Should Brake Discs Be Replaced?

How to Identify Yellow Label Vehicles?

Here are the methods to identify yellow label vehicles: 1. Judging by the year of manufacture: This is a simple way to identify yellow label vehicles. Generally, domestically produced vehicles manufactured before 1996 and imported vehicles manufactured before 1998 are classified as yellow label vehicles. The simplest criteria for identifying yellow label vehicles are: 1. Passenger cars and mini trucks with gasoline or gas fuel types registered before July 1, 2000; 2. Light trucks with gasoline or gas fuel types registered before October 1, 2001; 3. Medium and heavy-duty trucks (including semi-trailer tractors) and medium and large passenger cars with gasoline fuel types registered before July 1, 2003; 4. Medium and heavy-duty trucks (including semi-trailer tractors) and medium and large passenger cars with gas fuel types registered before September 1, 2001; 5. Mini and small passenger cars with diesel fuel types registered before July 1, 2008; 6. Mini and light trucks with diesel fuel types registered before July 1, 2009; 7. Medium and heavy-duty trucks (including semi-trailer tractors) and medium and large passenger cars with diesel fuel types registered before July 1, 2008. 2. Judging by the vehicle's exhaust emissions: Vehicles with spark-ignition engines that do not meet the National I standard or above and vehicles with compression-ignition engines that do not meet the National III standard or above are classified as yellow label vehicles. 3. Querying on the Motor Vehicle Environmental Protection Website: If owners want to know whether their vehicle is a yellow label vehicle, they can log in to the "Yellow Label Vehicle Query System" on the Motor Vehicle Environmental Protection Website, fill in the required information according to the system's instructions, and follow the steps to find out whether their vehicle is classified as a yellow label vehicle.

12

0

Share

What is the difference between part-time four-wheel drive and on-demand four-wheel drive?

On-demand four-wheel drive generally operates in two-wheel drive mode and automatically switches to four-wheel drive when necessary; the part-time four-wheel drive system requires manual switching between two-wheel drive, high-speed four-wheel drive, and low-speed four-wheel drive modes. Below are the specific differences between the two: 1. Different vehicle applications (1) Part-time four-wheel drive typically refers to four-wheel-drive vehicles with a manual transfer case. Most older domestic SUVs and the Jeep Wrangler use this system. These vehicles are usually equipped with solid front and rear axles, manual operation, simple structure, high reliability, and facilitate the installation of rear differential locks or front hub locks. (2) On-demand four-wheel drive is adopted by most urban SUVs. Among various four-wheel-drive systems, it achieves a balance between operational convenience and cost. They are mostly front-transverse engine configurations, with a drive shaft leading to the rear axle. Power is transmitted through a multi-plate clutch in series with the rear differential. Normally, it operates in front-wheel drive, and the computer automatically engages the clutch to drive the rear wheels when wheel slippage is detected. 2. Different technologies (1) Part-time four-wheel drive: The driver manually selects between two-wheel drive or four-wheel drive modes by engaging or disengaging the transfer case. This is the most common drive mode in SUV models. Its advantage is that it ensures both the vehicle's power and off-road capability while maintaining fuel economy. The slight drawback is that the driver needs to judge road conditions and manually operate the drive mode. (2) On-demand four-wheel drive: The switching between two-wheel drive and four-wheel drive is controlled by a computer chip. The notable feature of this system is that it inherits the advantages of full-time four-wheel drive and part-time four-wheel drive while compensating for their shortcomings. It can automatically identify the driving environment and control the switching between two-wheel drive and four-wheel drive modes based on changes in driving conditions. On low-traction surfaces such as bumpy, hilly, or winding roads, the vehicle automatically sets to four-wheel drive mode, while on flatter urban roads, it switches to two-wheel drive.

10

4

Share

What Are the Main Reasons for Excessive Vehicle Exhaust Emissions?

There are several reasons for excessive vehicle exhaust emissions: 1. Vehicle aging: If a vehicle has traveled more than 450,000 kilometers or has been in use for over 15 years, its components will show significant aging, poor contact, poor sealing, and insufficient pressure. 2. Failure of the three-way catalytic converter: The failure of the three-way catalytic converter is the primary reason for excessive vehicle exhaust emissions. The three-way catalytic converter is the most important external purification device installed in the vehicle's exhaust system. It converts harmful gases such as CO, HC, and NOx emitted by 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 certain 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. 3. Abnormal engine operation: The engine may experience issues such as misfiring, spark plug oil leakage, or oil mixing, causing it to run unevenly and weakly when the throttle is increased. 4. Dirty vehicle systems (intake system, exhaust system, fuel system): This situation usually occurs in relatively new vehicles, but the test results show excessive emissions or only slight exceedances by a few percent or fractions of a percent. This indicates that the vehicle's exhaust treatment system, including the three-way catalytic converter and oxygen sensor, is not significantly faulty. The cause of excessive emissions may be due to the three major systems (intake system, exhaust system, fuel system) being excessively dirty.

10

4

Share

After how many kilometers do tires need to be replaced?

Tires should generally be replaced after approximately 80,000 kilometers based on mileage. Here is more relevant information: 1. The typical service life of tires is 6 years. The mileage and road conditions vary, as do driving habits, so even for the same vehicle model, tire wear can differ. 2. On the sidewall of the tire, there is a '△' symbol every 30 degrees, which serves as a tire wear warning indicator. According to Chinese national standards, the tread wear limit for passenger car radial tires is 1.6mm, while for trucks and buses, it is 2.0mm. 3. Looking along the triangular symbol toward the tire surface, when the tread wears to 1.6mm above the groove base, the groove will begin to crack, showing noticeable fissures. For self-inspection, car owners can use a key for comparison—if the groove depth is close to the key's thickness, the tires need replacement.

4

2

Share

What does the EPC light on the dashboard mean?

The EPC indicator light can illuminate in two scenarios: during the power-on self-test and under other conditions. The power-on self-test is a pre-driving check that monitors all vehicle sensors. Typically, if the vehicle is not started after powering on, the light will turn off by itself after about 3 seconds. If the EPC light remains on after starting the vehicle or illuminates under other circumstances, common causes include faults in the engine intake system, throttle body, fuel system, engine, ECU control unit, or brake lights. Below is a detailed explanation of other reasons that may cause the EPC light to illuminate: Engine intake system fault: The EPC light may come on if the engine intake is obstructed or insufficient. Throttle body fault: Carbon buildup is a common issue with the throttle body, and dirt accumulation can also affect intake, triggering the indicator. Fuel system fault: Issues such as substandard fuel, fuel degradation, or poor fuel atomization can cause the light to illuminate. Engine fault: Insufficient engine pressure or problems with components like the intake valves can also trigger the EPC light. ECU control unit fault: Interference with the vehicle's computer signals or false alarms from the ECU may lead to the light turning on. Brake light fault: Malfunctions such as non-functional brake lights, faulty brake switches, or wiring issues can cause the EPC light to illuminate. Solutions for when the EPC light comes on: Address intake system faults, use the correct fuel grade, and clean the throttle body. Remove carbon deposits from relevant components. Re-flash the ECU with updated data. If the EPC light comes on, the driver can first try turning off the engine and restarting it to see if the light remains on. If it does not, the issue may have been temporary. However, if the light persists or frequently illuminates, the vehicle should be taken to the nearest service center for professional diagnosis and repair to eliminate potential safety hazards. EPC stands for Electronic-Power-Control, often referred to as the engine electronic stability system. The EPC system includes controllers and sensors related to the powertrain. When sensor data deviates from normal values, the system takes predefined actions to manage the powertrain. The EPC indicator typically appears in two colors: yellow and red. A yellow EPC light indicates a fault, but the vehicle can still be driven cautiously to a repair facility. A red EPC light signifies a more serious issue, requiring immediate stopping of the vehicle and contacting a professional for repairs. Continuing to drive with a red EPC light may damage core components or compromise safety.

18

3

Share

When will the National China 6 emission standard be implemented nationwide?

Key regions, the Pearl River Delta area, and the Chengdu-Chongqing region implemented the China 6 standard on July 1, 2019, while the rest of the country adopted it starting from July 1, 2020. Below is more information about the China 6 standard: 1. Article 4, Section 15 of the "Three-Year Action Plan for Winning the Blue Sky War" issued by the State Council clearly stipulates that key regions, the Pearl River Delta area, and the Chengdu-Chongqing region would implement the China 6 emission standard ahead of schedule starting from July 1, 2019. The promotion and use of gas vehicles meeting the China 6 emission standard were encouraged. 2. Fifteen provinces and municipalities across the country successively issued documents to implement the China 6 emission standard ahead of schedule in 2019, meaning that only vehicles meeting the China 6 standard could be registered from July 1, 2019. 3. After the implementation of the China 6 emission standard, all vehicles sold and registered must meet the requirements of the China 6 standard. Vehicles below this emission standard will be prohibited from being sold, registered, or transferred. China 4 and China 5 emission vehicles will only be allowed to be scrapped or relocated to regions where the China 6 standard has not yet been implemented.

5

4

Share

How Many Kilometers Should Brake Discs Be Replaced?

How to Identify Yellow Label Vehicles?

What is the difference between part-time four-wheel drive and on-demand four-wheel drive?

What Are the Main Reasons for Excessive Vehicle Exhaust Emissions?

After how many kilometers do tires need to be replaced?

What does the EPC light on the dashboard mean?

When will the National China 6 emission standard be implemented nationwide?

Why is the radiator still bubbling after replacing the cylinder gasket?

What Should Novice Drivers Pay Attention to During the Probationary Period?

What is the function of the shark fin on the back of a car?

Why does the car air conditioning only cool when accelerating?