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What is the reason why the car tachometer does not return to zero?

1 Answers
ReidMarie
07/29/25 8:35pm
The reasons why the car tachometer does not return to zero are: 1. The speedometer in the vehicle instrument cluster malfunctions, causing the tachometer needle to stop moving; 2. The vehicle's mileage sensor fails. Check if the flexible shaft connection is disconnected and observe whether the mileage starts to increase. If only the tachometer stops working, it needs to be replaced with a new one; 3. Foreign objects inside the instrument panel are stuck and cannot move. Open the instrument panel to remove the foreign objects. The tachometer is usually located inside the instrument panel, placed symmetrically with the speedometer. It operates based on magnetic principles, receiving pulse signals generated when the primary current in the ignition coil is interrupted, and converting these signals into displayable RPM values. The faster the engine speed, the more pulses the ignition coil generates, resulting in a higher RPM value displayed on the tachometer.
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Will the traffic police send an SMS to the car owner after a traffic violation?

Yes, for non-on-site law enforcement violations recorded by traffic authorities, the traffic management department will send an SMS to the car owner within three to four days. Non-on-site law enforcement refers to violations recorded by monitoring cameras, electronic eyes, and other electronic monitoring devices. After the monitoring devices record the violation, it undergoes manual review and data upload before being made available for query. Therefore, when the car owner receives the SMS notification, they can also check the corresponding violation record online. The methods for querying vehicle violations are as follows: Query via touchscreen terminals: Visit the office halls of the traffic police branches in various districts and counties to query through touchscreen terminals. Query via external service websites: Log in to the external service websites of the Public Security Traffic Management Bureau of each city: find the vehicle violation query section, enter the license plate number and vehicle engine number, and click to query. Car owners can also log in to the National Vehicle Traffic Violation Query Service Platform for inquiries.
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At what voltage can a motorcycle battery no longer start the motorcycle?

Motorcycles generally cannot start when the battery voltage drops below approximately 11 volts. Reasons why a motorcycle fails to start: It may be due to insufficient battery voltage, which can be checked using a voltmeter; if the motorcycle is frequently used for short-distance, low-speed urban rides, the battery may discharge. The motorcycle battery serves as an auxiliary power source, primarily aiding in vehicle startup, storing electrical current, and providing some voltage stabilization. Additionally, large spark plug gaps could be a factor. Introduction to motorcycles: Powered by a gasoline engine and steered via handlebars controlling the front wheel, motorcycles are two- or three-wheeled vehicles known for their lightweight agility and speed. They are widely used for patrol duties, passenger and cargo transport, and also serve as sports equipment. Broadly categorized, motorcycles include street bikes, road racing motorcycles, off-road motorcycles, cruisers, and touring bikes.
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What is the license plate code Wan C for?

Wan C is the license plate code for Bengbu City in Anhui Province. The license plate codes for various cities in Anhui Province are as follows: Wan A for Hefei, Wan B for Wuhu City, Wan D for Huainan City, Wan E for Ma'anshan City, Wan F for Huaibei City, Wan G for Tongling City, Wan H for Anqing City, Wan J for Huangshan City, Wan K for Fuyang City, Wan L for Suzhou City, Wan M for Chuzhou City, Wan N for Lu'an City, Wan P for Xuancheng City, Wan Q for Chaohu City, Wan R for Chizhou City, and Wan S for Bozhou City. License plates are plates hung on the front and rear of vehicles, usually made of aluminum, iron, plastic, or paper, inscribed with the vehicle's registration number, registration region, or other relevant information.
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Will the car dash cam detect a very light touch?

A very light touch will not be recorded by the dash cam. The functions of a dash cam: To protect the legitimate rights and interests of drivers. In case of a scrape or collision with pedestrians crossing the road or cyclists and motorcyclists, there might be extortion attempts. With a dash cam, drivers can provide valid evidence by replaying the recorded footage, making the accident responsibility clear at a glance. This enables traffic police to handle the accident quickly and accurately; it not only allows for a quick evacuation of the scene to restore traffic but also preserves valid evidence of the incident, creating a safe and smooth traffic environment. Points to note about dash cams: Such as the clarity of the image, which is the most intuitive functional experience during use. When the video from the dash cam cannot provide clear feedback, the overall user experience is poor. Factors affecting clarity include the frame rate of the image and the aperture.
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Can I Switch from Manual to Automatic Transmission Midway Through Learning?

It is possible to switch from manual to automatic transmission midway through learning. You can change to automatic transmission before taking the Subject 2 test. Introduction to Manual Transmission License: This refers to the C1 license. The C1 driver's license allows driving small cars, mini trucks, mini passenger vehicles, and light, small, mini special-purpose vehicles. It also permits driving C2, C3, and C4 vehicle types. C2 refers to automatic transmission vehicles. Introduction to Automatic Transmission License: This refers to the C2 license. The C2 license only allows driving small automatic transmission cars, mini automatic transmission trucks, mini automatic transmission passenger vehicles, and light vehicles. However, it does not permit driving manual transmission vehicles. The C2 test items are the same as those for C1, but Subject 3 is relatively easier because automatic transmission vehicles do not require frequent gear shifting and clutch operation, making it easier for beginners to get started.
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Should the transmission fluid be replaced if the transmission is flooded?

It is recommended to replace both the transmission fluid and differential oil after the transmission is flooded. Hazards of not replacing the transmission fluid: 1. Damage to the transmission shift control mechanism; 2. Abnormal wear of gears and clutch plates inside the transmission; 3. Impaired normal operation of the transmission, leading to damage of the transmission valve body. Transmission fluid is different from engine oil. Although both serve a lubricating function, their specific roles differ and should not be confused. Differences: Engine oil is the lubricant for the engine system, possessing properties such as oxidation resistance, anti-wear, and anti-corrosion. Transmission fluid, on the other hand, is primarily used to keep the gear system clean and extend the service life of internal transmission components. Due to the distinct structures and operating environments of transmissions and engines, transmission fluid cannot be used as engine oil, nor can engine oil be used as transmission fluid.
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