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What Does the Wrench Symbol on a Vehicle Mean?

1 Answers
Christine
07/25/25 4:54am
When a wrench symbol appears on a vehicle, it serves as a reminder for the owner to perform maintenance. The car automatically activates this warning light at specific mileage intervals to prompt timely servicing, indicating that the vehicle requires maintenance rather than signaling a fault. Therefore, it is recommended that the owner schedule maintenance as soon as possible. The maintenance light is a tool that records the usage mileage of critical components, providing a reminder function when internal parts begin to wear significantly. Vehicle maintenance is categorized into major and minor services. Minor maintenance primarily involves replacing the engine oil and oil filter, while major maintenance includes replacing additional components such as the air filter, cabin air filter, and more. The replacement intervals for parts like spark plugs, brake fluid, and transmission fluid are not fixed and should be determined by referring to the vehicle's maintenance manual.
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When Should the Crawl Control System Be Used?

Crawl control system is mainly used when climbing steep slopes or driving in special road conditions such as rain and snow, rocky roads, and sandy terrain. It automatically controls the engine and brakes while maintaining low-speed driving, thereby achieving excellent and stable passability. Below is an introduction to the crawl control system: 1. Definition of the crawl control system: The crawl control system (CRAWL Control), officially known as the 'Low-Speed Cruise Driving Assist System,' can be simply understood as the vehicle autonomously controlling engine torque output, the transmission system, and the braking system to allow the vehicle to pass through rough terrain at an extremely slow speed. 2. Function of the crawl control system: It prevents wheel slippage or vehicle entrapment caused by excessive speed. In other words, this crawl control system does not require the driver to manually operate the vehicle. Instead, it autonomously controls the vehicle through a computer system, adjusting torque output and distributing braking force to all four wheels based on road condition feedback, thereby achieving wheel slip limitation.
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What Causes Oil to Enter the Spark Plug?

Oil entering the spark plug is due to the aging of the valve cover gasket, which is responsible for sealing the engine lubricating oil. When this component ages, lubricating oil naturally appears on the spark plug. Additionally, the spark plug itself may have quality issues (such as gap misalignment or short circuits), and these oil contaminants enter through the threads, necessitating the replacement of a new spark plug. The spark plug, commonly known as the 'fire nozzle,' functions by discharging the high-voltage pulse electricity sent from the high-voltage wire (spark plug wire), breaking down the air between the two electrodes of the spark plug to generate an electric spark, thereby igniting the air-fuel mixture in the cylinder. The main types of spark plugs include: standard spark plugs, extended insulator spark plugs, electrode-type spark plugs, seat-type spark plugs, pole-type spark plugs, and surface-gap spark plugs, among others.
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How to Test Whether an Oxygen Sensor is Good or Bad?

To test whether an oxygen sensor is good or bad, unplug the oxygen sensor connector and observe whether the engine fault disappears. Below is a detailed introduction to the oxygen sensor: Overview of the Oxygen Sensor: The automotive oxygen sensor is a critical sensing component in the electronic fuel injection engine control system. It is a key part in controlling vehicle exhaust emissions, reducing environmental pollution caused by vehicles, and improving the fuel combustion quality of the car engine. Oxygen sensors are installed on the engine exhaust pipe. Main Functions of the Oxygen Sensor: The oxygen sensor enables the engine to obtain the optimal concentration of the air-fuel mixture, thereby reducing the emission of harmful gases and saving fuel. By measuring whether there is an excess of oxygen in the exhaust after engine combustion, the oxygen sensor converts the oxygen content into a voltage signal and transmits it to the engine computer, allowing the engine to achieve closed-loop control targeted at the excess air factor.
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How to Drive a Dual-Clutch Automatic Transmission?

Dual-clutch is just one type of clutch transmission mechanism, and in terms of driving techniques, it is almost no different from a regular AT automatic transmission car. The specific details are as follows: Differences between dual-clutch automatic transmission and manual transmission: The dual-clutch automatic transmission (abbreviated as DCT) is based on the manual transmission. Unlike the manual transmission, the two clutches in DCT are connected to two input shafts, and gear shifting and clutch operations are achieved through an integrated mechatronic module of electronic and hydraulic components, rather than through a clutch pedal operation. It is similar to a tiptronic hydraulic automatic transmission. Manual shifting: The driver can manually shift gears or place the gear lever in the fully automatic D mode (comfort mode, shifting at low engine speeds) or S mode (sport mode, shifting at high engine speeds). In this mode, gear shifting is usually achieved by the gear and clutch actuators.
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Why Do Diesel Vehicles Emit White Smoke?

Diesel vehicles emit white smoke due to the following reasons: 1. Insufficient combustion temperature: When the engine temperature is too low, the fuel injected into the cylinder forms a mixture with air that cannot fully combust, resulting in white smoke from the exhaust pipe. 2. Water in the diesel fuel: The presence of water in diesel directly affects the normal combustion of the mixture, causing white smoke. 3. Delayed fuel injection: If the fuel injection timing is too late, the cylinder temperature has already dropped by the time of injection, causing some diesel to turn into vapor without burning, leading to white smoke. 4. Poor fuel injector atomization: Inadequate atomization prevents the diesel from burning completely, and when it mixes with the high-temperature exhaust gases from normally functioning cylinders in the exhaust pipe, white smoke is produced. 5. Low cylinder pressure: Some diesel turns into vapor without burning, thus emitting white smoke from the exhaust pipe.
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How to turn on the headlights of the Volkswagen Lavida?

Method to turn on the headlights of the Volkswagen Lavida: Turn forward two gears for the turn signal; when the ignition switch is in the "ON" position, rotate the lever clockwise to activate the right turn signal, or rotate it counterclockwise to activate the left turn signal. After completing the turn, the turn signal will turn off, and the switch will return to its normal position. The Lavida is a model under Shanghai Volkswagen, with body dimensions of 4605mm in length, 1765mm in width, and 1460mm in height, and a wheelbase of 2610mm. In terms of color scheme, the Lavida inherits the traditional "dark top and light bottom" color combination of Volkswagen models in China. However, between these two, it incorporates a design style inspired by Japanese mid-size cars, adding a wood grain trim that blends with the center console.
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