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What is the definition of the OBD interface?

1 Answers
SanDaisy
07/29/25 5:04pm
The OBD interface in a car is used to connect to a diagnostic computer. The specific details are as follows: 1. Modern vehicles have highly advanced electronic systems and fault diagnosis systems. When a part of the vehicle malfunctions, the computer generates a fault code. These fault codes are not directly displayed on the dashboard; they can only be read by connecting a fault diagnosis computer to the OBD interface. The OBD interface not only connects to a fault diagnosis computer but can also connect to some external displays. Once connected, the external display can read certain data, such as water temperature. 2. During modifications, technicians who tune the computer also need to connect to the vehicle via the OBD interface. This allows engineers to read certain vehicle data on their laptops. The OBD interface is very important and is usually located near the driver's pedal area. When using the vehicle, be careful not to let dirt enter the OBD interface and avoid contact with it. Some vehicles require a specialized computer to read data, as generic computers cannot access the data. For such vehicles, data reading must be done at a 4S shop using the specialized computer.
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Can Windshield Washer Fluid Be Replaced with Tap Water?

Windshield washer fluid can be replaced with tap water, but it is not recommended. Below are the functions of windshield washer fluid: 1. Cleaning performance: Windshield washer fluid is formulated with various surfactants and additives. Surfactants typically have functions such as wetting, penetrating, and solubilizing, thereby achieving the effect of cleaning and removing dirt. 2. Antifreeze performance: The presence of alcohol and ethylene glycol can significantly lower the freezing point of the liquid, thus providing antifreeze effects and quickly dissolving frost. 3. Anti-fog performance: A single-molecule protective layer forms on the glass surface. This protective film prevents the formation of fog droplets, ensuring the windshield remains clear and transparent with a clear field of vision. 4. Anti-static performance: After cleaning with windshield washer fluid, substances adsorbed on the glass surface can eliminate static charges on the glass, providing anti-static properties. 5. Lubrication performance: The ethylene glycol in windshield washer fluid has high viscosity, which can provide lubrication, reduce friction between the wiper and the glass, and prevent scratches.
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Can a Car Steering Wheel Be Replaced?

Car steering wheels can be replaced as long as the connectors, airbag size, etc., are compatible. Methods for modifying a steering wheel: 1. Installing a steering wheel cover: Materials include genuine leather and faux leather, among others, and you can choose based on personal preference. It is important to select the right thickness, as a cover that is too thick or too thin can significantly affect the driving experience. Additionally, ensure a proper fit—if it is too loose, it may slip during turns. It is best to purchase a product specifically designed for your vehicle model. 2. Swapping with a compatible steering wheel: A common modification is to use a steering wheel from a higher-end model of the same brand. Note that some models may require replacing the airbag and wiring harness to enable multifunction buttons and paddle shifters (if the original vehicle supports these features). 3. Racing steering wheels: Modifying with such steering wheels has several drawbacks, such as: reduced size potentially obstructing the instrument panel, hands easily hitting the wiper switch, increased steering effort, and inability to install an airbag. Therefore, when choosing this type of steering wheel, be mindful of these drawbacks. For vehicles equipped with airbags, it is best to avoid such modifications.
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What unit is used to measure car speed?

There are two units used to indicate vehicle speed: km/h and mph. The speed unit used in China is km/h. 1mph=1.609344km/h, 1km/h=0.6213712mph. Below are relevant explanations: 1. Different vehicle series use different units: Generally speaking, Japanese, Korean, and German cars tend to use kilometers per hour (km/h) to indicate speed; American cars usually use miles per hour (mph), which depends on the country. 2. Explanation of horsepower: Horsepower is an important parameter of an engine, referring to the work done by the engine per unit time. This means that for cars of the same mass, the greater the engine's power, the higher the car's speed value. 3. Vehicle speed regulations: Motor vehicles must not exceed the speed limit signs when driving on roads. On roads without a centerline, the speed limit is 30km/h for urban roads and 40km/h for highways. On roads with only one motor vehicle lane in the same direction, the speed limit is 50km/h for urban roads and 70km/h for highways. When making turns, the maximum speed of motor vehicles must not exceed 30km/h.
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Is there a subsidy for applying for vehicle scrapping?

There is a subsidy for applying for vehicle scrapping. The subsidy regulations remain the same as before, but this year, an additional penalty has been introduced for vehicles that are not scrapped as required. If a vehicle meets the scrapping requirements but fails to deregister in time, the vehicle management office will invalidate its license plate number and driving license. The specific regulations are as follows: 1. Private cars: including 5-seat sedans and 7-seat SUVs, non-operational small and micro vehicles have no usage period limit but will be guided to scrap when the mileage reaches 600,000 kilometers. If the vehicle is over 15 years old but the mileage has not reached 600,000 kilometers, it must undergo annual inspections twice a year, and those failing the inspection will be forcibly scrapped. 2. Taxis: The usage period is 8 years, after which they will be forcibly guided to scrap. 3. Pickup trucks: Domestic pickup trucks must be forcibly scrapped after 15 years. 4. Medium-sized taxi passenger vehicles: The usage period is 10 years, after which they will be forcibly guided to scrap. 5. Heavy, medium, and light-duty trucks: The usage period is 15 years, after which they will be forcibly guided to scrap. 6. Semi-trailer tractors: The usage period is 15 years, after which they will be forcibly guided to scrap. 7. Micro trucks: The usage period is 12 years, after which they will be forcibly scrapped.
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What does the internal and external circulation of a car mean?

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Does a car battery need to be replaced when it has 40% remaining charge?

A car battery with 40% remaining charge does not need to be replaced. The typical usage cycle of a car battery is 27 months. For regular household vehicles that are not frequently used, replacement can be done every 3-4 years, and subsequently every two years or so. For commercial vehicles like taxis that are used frequently, the battery may need replacement every year or around 8-10 months. However, the replacement cycle is only a reference, and the actual decision should be based on specific conditions. Methods to determine if a car battery needs replacement: Check the battery appearance: Look for obvious signs of swelling, deformation, or bulging, and check whether there are white or green powdery substances around the battery terminals or sides. These substances are battery oxides. High-quality or new batteries are less likely to oxidize. If oxides are present, it indicates a performance issue with the battery, and replacement is necessary. Check the charge indicator: Some maintenance-free batteries come with a charge indicator, usually displaying three colors: green, yellow, and black. Green indicates sufficient charge, yellow means slightly low charge, and black signals that the battery is nearing the end of its life and needs replacement. Measure the battery voltage: Use a battery tester or multimeter to measure the battery voltage to determine whether the car battery needs replacement.
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