What does the 30km/h sign mean?

Why do cars need to add urea now?

Nowadays, cars add urea mainly to meet emission standards. Only diesel vehicles require urea addition. National regulations mandate that electronically controlled diesel engine vehicles must add urea because diesel vehicles emit higher levels of exhaust gases. Adding urea can reduce carbon oxides in the exhaust and lower pollutant emissions, making diesel vehicles more environmentally friendly. Currently, most diesel engines use Selective Catalytic Reduction (SCR) technology, meaning that after the engine exhaust is discharged from the turbocharger, it needs to pass through a catalytic converter before entering the vehicle's exhaust pipe. The urea nozzle on the exhaust pipe will spray urea under the control of the onboard computer.

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Why Should You Add Antifreeze to Your Car in Summer?

Reasons for adding antifreeze to your car in summer: It can prevent the engine coolant from boiling. Antifreeze is a liquid composed of antifreeze additives, additives that prevent metal corrosion, and water. It has the properties of antifreeze, anti-corrosion, heat conduction, and non-deterioration. Methods for adding antifreeze: 1. Wait for the car to cool down, open the engine compartment to check for cracks and signs of leakage in the pipes; 2. Open the radiator drain valve to release the antifreeze; 3. Use a rubber tube to introduce tap water into the tank, allowing the tap water to flow through the engine's cooling system to clean the radiator until clear water comes out of the radiator; 4. After draining the water, close the radiator drain valve and add antifreeze to the radiator's filling port until it is full; 5. Open the lid of the liquid storage tank and add antifreeze until it reaches the higher mark line.

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What is the difference between Audi A3 and Audi S3?

One is the S series, which is Audi's high-performance emblem, and the other is just the ordinary A series, with the key difference lying in performance. Below are the distinctions between the two: 1. As a performance model, the S3, despite sharing the same 2.0T engine with the A3, boasts significantly higher power parameters. With the same cylinder size, the S3 delivers an additional 50kW and 30Nm of power compared to the A3. 2. In terms of dimensions, there is not much difference. The minor discrepancies of a few millimeters are merely due to suspension tuning and aerodynamic kits, which can be largely ignored. 3. For the interior, the S3 features a flat-bottom steering wheel that is moderately thick and exquisitely designed, promising an excellent grip. The sporty red and black interior combination is highly effective in stimulating the driver's fighting spirit. In contrast, the A3's interior is much more conventional, fitting the standard family car category.

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Why should you turn off the air conditioning before turning off the car?

Leaving the air conditioning on after turning off the car can reduce the battery's lifespan. This is because the engine cannot drive the compressor after the car is turned off, making the air conditioning unable to cool. The car's battery powers the air conditioning when the engine is not running. The alternator is the main power source of the car, functioning to supply power to all electrical devices (except the starter) while the engine is running normally, and simultaneously charging the battery. Based on the three-phase stator winding of a conventional alternator, the number of winding turns is increased, and additional terminals are added, along with an extra three-phase bridge rectifier. At low speeds, the output is from the original winding and the additional winding in series, while at higher speeds, only the original three-phase winding provides the output.

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Why Do Vehicles Need Urea?

Vehicles require urea for the following reasons: 1. To reduce vehicle exhaust emissions; 2. To convert harmful nitrogen oxides in the exhaust into nitrogen and water. Diesel vehicles equipped with a urea system need a urea tank to store the urea solution. The ECU calculates the theoretical generation of nitrogen oxides based on data such as engine speed and fuel injection volume. Vehicle urea plays a crucial role in the vehicle's power and fuel consumption. Failure to use diesel exhaust fluid or using urea solutions with insufficient purity or inferior quality can cause the vehicle's engine to automatically reduce speed. Inferior-quality diesel exhaust fluid can contaminate the catalyst in the SCR catalytic reaction tank, leading to damage to the components of the after-treatment system.

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Why Should Car Spark Plugs Be Replaced?

If spark plugs are not replaced for a long time, it can cause various issues such as leakage in the vehicle's ignition system, increased fuel consumption, and reduced power. The most significant problem is difficulty in ignition, which affects the normal operation of the vehicle. Severe erosion of the spark plug, such as scarring at the top, damage, or melted electrodes, indicates that the spark plug is damaged and should be replaced. Methods to determine if a spark plug is damaged: Remove the spark plug and observe it. The condition of the spark plug can be judged based on its appearance and color. A normal spark plug has an insulator skirt and electrodes that appear gray-white, gray-yellow, or light brown. A properly functioning spark plug has a reddish-brown insulator skirt, with an electrode gap between 0.8-0.9mm and no signs of electrode burn. If the spark plug is covered in oil or deposits but is not damaged, it can continue to be used after cleaning off the oil and deposits. If the spark plug is severely damaged, with phenomena such as scarring, black streaks, cracks, or melted electrodes, the cause of the damage should be identified. After troubleshooting, replace the spark plug with a new one. Additionally, if the spark plug appears black as if smoked, it indicates that the wrong heat range was selected or that the air-fuel mixture is too rich, causing oil to rise.

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What does the 30km/h sign mean?

Why do cars need to add urea now?

Why Should You Add Antifreeze to Your Car in Summer?

What is the difference between Audi A3 and Audi S3?

Why should you turn off the air conditioning before turning off the car?

Why Do Vehicles Need Urea?

Why Should Car Spark Plugs Be Replaced?

Where is the rear fog light located on a car?

What are the symptoms of a faulty turbocharger?

What are the symptoms of a faulty car temperature sensor?

How to Install a Car Spoiler?