What level of car is the Changan Yuexiang?

How to interpret the tire pressure chart on the car door?

The information provided on the tire pressure chart includes the recommended tire pressure values for front and rear wheels under both full load and empty load conditions for different tire models. How to read a car tire pressure gauge: Many modern cars can directly display tire pressure status through tire pressure monitoring systems. For models without this feature, a dial-type tire pressure gauge is needed. Using a dial-type tire pressure gauge is very simple: connect it to the tire valve stem and read the pressure from the dial. These gauges typically have two concentric circles of numbers—the inner circle with larger numbers represents psi (pounds per square inch), while the outer circle with smaller numbers represents bar. Generally, you should refer to the outer circle (bar) for readings. For ordinary family cars, the recommended tire pressure is usually between 230-250 kPa (or 2.3-2.5 bar). In summer, when temperatures are high and tires heat up during driving, excessive pressure can increase the risk of a blowout, so it's advisable to slightly reduce the pressure. In winter, due to thermal contraction, the pressure should be increased by approximately 0.2 bar, maintaining it between 2.5-2.8 bar. Effects of tire pressure variations: Tire pressure can be slightly higher (around 0.2 bar), but excessive pressure should be avoided. Overinflation increases the load on the tires during driving, raising the risk of blowouts. It also leads to greater body vibration, increased tire noise, and reduced comfort. On the other hand, underinflation is even more dangerous. Low tire pressure increases the contact area between the tire and the road, resulting in higher friction resistance, heavier steering, and increased fuel consumption. Insufficient pressure causes excessive sidewall flexing, accelerating the aging of internal steel belts and fabric layers, which can also lead to blowouts. This not only shortens tire lifespan but also poses significant safety risks while driving.

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What does the driving license subject four test include?

According to the "Regulations on the Application and Use of Motor Vehicle Driving Licenses," the subject four test consists of 50 questions, primarily in the form of case studies, images, animations, etc., with a full score of 100 and a passing score of 90. Subject four, also known as the theoretical test or driver theory test, is part of the motor vehicle driving license assessment. After the implementation of the Ministry of Public Security's Order No. 123, the subject three test was divided into two parts: the road test and an additional safety and civilization knowledge test, commonly referred to as subject four. It is not a separate subject but is called subject four because it is conducted after subject three. Officially, there is no subject four. The safety and civilized driving knowledge test is conducted after subject three. There is no limit to the number of attempts for the subject four test. If the first attempt on the day is not passed, an immediate retake is allowed. If it is still not passed, a new appointment is required, and no retake fee is charged. However, it is important to note that the validity period of the driving skill test permit is three years. If the applicant does not complete the test within the validity period, the results of the previously passed subjects will be invalidated. Subject four test considerations: Test duration: The test lasts 30 minutes, and if 12 points (6 questions) are answered incorrectly during the test, the session will be terminated. Number of questions: Depending on the type of driving license being tested, 50 questions are proportionally selected from the corresponding subject four question bank. For small vehicle licenses, questions are selected from 800, and for large vehicle licenses, from 1023. Each question is worth 2 points. Question types: The test includes single-choice questions (including true/false questions) and multiple-choice questions. The first 45 questions are single-choice, and the last 5 are multiple-choice. The test also includes animation questions, image questions, scenario recognition questions, and text-based questions. Retake considerations: If subject four is not passed, only subject four needs to be retaken. The driving school will schedule the retake, and there is no limit to the number of retakes. No retake fee is required for subject four. Subject four test tips: Strengthen weak areas by identifying the reasons for mistakes. For marked questions, do not just look at the correct answer and memorize it. Refer to regulations, textbooks, or reference books to understand the reasons for errors and digest them. Categorize and summarize test questions. Refer to the question bank analysis for classification and find similar questions: Many questions in the bank are similar and easily confused, so they should be analyzed collectively. For example, traffic signs for walking, hiking, pedestrian caution, crosswalks, and crosswalk caution are very similar and easily mixed up. Grouping them during study helps avoid mistakes. Find memory techniques: Many questions in the bank involve numbers. Summarizing these numbers can make memorization easier. There are three subjects in the driving test: subject one, subject two, and subject three, with subject three divided into two parts. Subject one refers to the test on road traffic safety laws, regulations, and related knowledge; subject two refers to the field driving skill test; and subject three refers to the road driving skill and safety and civilized driving knowledge test.

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Where Does the Wind Leakage Noise at High-Speed Window Corners Come From?

Roll down the window glass and press down on the upper right corner of the sealing strip near the door frame, and a small hole will appear. The wind enters from here, causing the wind leakage noise at high-speed window corners. You can roll 3M double-sided tape into a xylitol-sized shape and stuff it in until it's full, which can reduce the wind noise. Additionally, if you notice excessive noise inside the car during high-speed driving, you can check the following possible causes: Engine Noise: Engine abnormal noise is the most noticeable among car noises. Engine abnormal noises are divided into cold engine noise and hot engine noise. Cold engine noise refers to the abnormal noise coming from the engine compartment when starting the car, which disappears after the engine warms up. This noise occurs because the car has been parked for a long time, and the lubricating oil has almost entirely flowed back into the oil pan. During a cold start, the oil pump cannot immediately establish oil pressure, and oil films cannot form between components, especially the valves inside the cylinder head (upper part). During a cold start, whether it's hydraulic lifters or mechanical rocker arms, there will be some valve clearance, or the timing chain may not operate properly due to insufficient oil pressure, leading to the noise. As for hot engine noise, excluding inherent factors, the noise either indicates a problem with a part or a malfunction of a certain component. Therefore, if you notice the engine noise is getting louder, you should promptly take the car to a repair shop for inspection. Tire Noise: Tire noise is generally caused by air flow through the gaps in the tire tread pattern, resulting in air noise. Since tires are made of rubber, they tend to harden and age over time, leading to natural noise production. New tires have good elasticity, offering better performance in terms of both noise and comfort. If the tire noise is too loud, check if the tires have aged, and replace them if necessary. Chassis Noise: Generally, chassis noise is due to problems with the shock absorbers. The entire car will produce significant noise when driving over uneven road surfaces. At this point, you should check the car's shock absorbers to see if there is severe oil leakage.

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What does an engine OBD fault mean?

An engine OBD fault refers to the On-Board Diagnostics system, which alerts the driver when a fault occurs in the control system or related components. The OBD device monitors multiple systems and components, including the engine, catalytic converter, particulate trap, oxygen sensors, emission control system, fuel system, EGR, etc. OBD connects various emission-related component information to the ECU, which has the capability to detect and analyze emission-related faults. When an emission fault occurs, the ECU records the fault information and related codes. Reading the fault codes allows for quick and accurate identification of the nature and location of the fault.

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What are the maintenance items in a car?

Car maintenance items mainly include the replacement of engine oil and oil filter, air filter, fuel filter, spark plugs, transmission oil, and related system inspection and maintenance items. The replacement of engine oil and oil filter is primarily for the maintenance of the lubrication system. The cleaning and maintenance of the air filter depend on the usage environment, while the fuel filter is generally replaced after driving 20,000 to 25,000 kilometers. Car maintenance refers to the regular preventive work of inspecting, cleaning, replenishing, lubricating, adjusting, or replacing certain parts of the car. Its purpose is to keep the car clean, maintain normal technical conditions, eliminate hidden dangers, prevent faults, slow down the deterioration process, and extend the service life.

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What to Do When the Automatic Transmission P Gear Won't Release?

Here are the solutions when the automatic transmission P gear won't release: 1. Start the vehicle first, then shift to other gears; 2. Press the brake pedal before switching gears. Always ensure the vehicle comes to a complete stop before engaging the P gear to prevent this issue. With technological advancements, transmissions have evolved from manual to automatic shifting, but automatic transmissions have specific requirements. Improper operation or forced gear shifting can easily damage the transmission. The working principle of the automatic P gear is that when the gear lever is in the P position, the parking lock mechanism locks the transmission output shaft, partially locking the driveshaft inside the transmission. On level ground, the vehicle will have braking force even without pressing the brake pedal.

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What level of car is the Changan Yuexiang?

How to interpret the tire pressure chart on the car door?

What does the driving license subject four test include?

Where Does the Wind Leakage Noise at High-Speed Window Corners Come From?

What does an engine OBD fault mean?

What are the maintenance items in a car?

What to Do When the Automatic Transmission P Gear Won't Release?

What is the Blue Whale Engine?

What is the principle of an AT transmission?

Can't File the Driver's License After Replacement in Another Location?

What is the traffic violation code 1345?