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Where to Get a Replacement When the Car Key Battery Dies?

1 Answers
Terrence
09/01/25 5:49am
It is generally recommended to replace the car key battery at a 4S dealership, as improper operation by many car owners can damage the car key. Below are specific details about car key batteries: 1. Battery Replacement Cycle: The battery of a car smart key typically needs to be replaced every 2-3 years. Electronic keys usually use large button batteries, and the battery model should be configured according to the individual car model. If the control distance of the car key is less than half of the maximum remote control distance or less than five to six meters, the battery should be replaced promptly. 2. Battery Maintenance Methods: The battery of the car key also requires attention to maintenance. Car owners should avoid frequently pressing the car key buttons during use, which can help conserve battery power. Additionally, the car key must be stored in a dry place, with attention to fire prevention and moisture protection.
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More Forum Discussions

How to Replace Brake Fluid by Yourself?

Here are the steps to replace brake fluid by yourself: 1. Open the hood: Park the vehicle on a flat surface, turn off the engine, open the hood, and use a syringe to extract the fluid from the reservoir until it is empty. 2. Add new brake fluid: Fill the reservoir with new brake fluid. Use a funnel during pouring to avoid spilling onto the engine compartment, as brake fluid is corrosive. 3. Remove the tire: Use a jack to lift the vehicle, starting with the rear wheels, and remove the tire. 4. Locate the bleed screw: Find the bleed screw on the brake caliper and remove the rubber dust cap. 5. Loosen the bleed screw: Use a wrench to loosen the bleed screw, attach a rubber tube to it, and connect the other end to a drain bottle. 6. Begin pumping the brake pedal: If two people are working together, one can pump the brake pedal while the other observes the fluid drainage. Pay attention to the color of the brake fluid in the rubber tube. Old fluid is darker, while new fluid is lighter. If the fluid coming out of the tube is the lighter new fluid, the fluid replacement for that wheel is complete. Stop pumping the brake pedal, reinstall the tire, and repeat the process for the remaining three wheels.
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What is the fuel tank capacity of the Mustang in liters?

The fuel tank capacity of the Mustang is 58.9 liters, as officially announced. Owners who have purchased the Mustang can also check this information on the vehicle's configuration sheet. The Mustang uses 92-octane fuel, with a fuel consumption ranging from 8.6 to 12.2L per 100 kilometers. A full tank can cover a distance of 483 to 685 kilometers. During daily driving, it is essential to always pay attention to the remaining fuel level in the tank. This is typically observed through the fuel gauge inside the vehicle. If there are no other issues, the fuel level will be accurately reflected on the gauge. The fuel gauge usually has 5 to 6 segments, and it is advisable to refuel when there are about 2 segments left to avoid running out of fuel midway. During actual refueling, the amount of fuel added may exceed the marked capacity. This is because the fuel tank capacity marked by the manufacturer is measured from the bottom of the tank to the safe fill level. There is additional space from the safe fill level to the tank opening, which is designed to allow for fuel expansion when temperatures rise, preventing overflow. If fuel is added up to the tank opening during refueling, the actual amount of fuel added may exceed the marked tank capacity.
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What causes high low pressure and low high pressure in car AC with no cooling?

The reasons for low high pressure and high low pressure in car AC are as follows: When pressure gauges show this phenomenon and there's sufficient refrigerant in the pipeline, yet the AC fails to cool, the issue likely lies with the AC compressor. There may be internal leakage in the compressor, and replacing it usually solves the problem. Below are relevant details: 1. Components of car AC: The car air conditioning system mainly consists of compressor, electromagnetic clutch, condenser, evaporator, expansion valve, receiver drier, hoses, condenser fan, vacuum solenoid, idle speed controller, and control system. 2. Classification of car AC: The car AC system is divided into high-pressure and low-pressure pipelines: (1) The high-pressure side includes compressor output side, high-pressure pipelines, condenser, receiver drier, and liquid pipelines; (2) The low-pressure side includes evaporator, accumulator, return pipelines, compressor input side, and compressor oil sump. 3. Components of car AC refrigeration system: The car AC refrigeration system consists of compressor, condenser, receiver drier, expansion valve, evaporator, and blower. These components are connected by copper pipes (or aluminum pipes) and high-pressure rubber hoses to form a sealed system. During operation, refrigerant circulates through this closed system in different states, with each cycle divided into four basic processes: compression, heat dissipation, throttling, and heat absorption. These processes repeat continuously to achieve the purpose of lowering the air temperature around the evaporator.
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Why does the ETC device prompt 'Label Removed'?

ETC displays 'Label Invalid' due to unauthorized removal or relocation of the OBU device, or detachment/loosening of the ETC electronic tag. It needs to be reinstalled and reactivated at the original processing point or any highway ETC service center. The ETC installation process is as follows: Upon receiving the device, first check if the ETC card and electronic tag (OBU) are damaged. Press the anti-removal button on the back of the OBU; a red light will briefly turn on, and the OLED screen will display 'Label Invalid' or 'Please Insert Card,' indicating the device is functioning normally. Clean the front windshield to ensure the surface is smooth, clean, and dry. Then peel off the adhesive backing of the OBU and stick it to the installation position. Press firmly for 2-3 minutes to remove any air bubbles. Insert the ETC card with the front facing the driver and the back facing the windshield, ensuring the chip is inserted into the OBU device. ETC activation method: Insert and remove the ETC card twice consecutively until the electronic tag screen displays 'Bluetooth On.' If 'Label Invalid' appears when inserting/removing twice without the electronic tag attached, this is normal and does not affect activation. Alternatively, press the button on top of the electronic tag to enable Bluetooth. Turn on your phone's Bluetooth and open the corresponding mobile app (usually with a download QR code on the electronic tag), then enter the device activation interface. Click 'Device Connection' and wait patiently for the 'Connection Successful' prompt. After successful connection, upload a photo of the vehicle's front to complete activation.
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How much engine oil remaining indicates the need for maintenance?

When the remaining engine oil drops below approximately 10%, the vehicle's combination instrument will issue a prompt to replace the oil promptly, and maintenance should be performed as soon as possible in response to this reminder. During maintenance, all the engine oil should be replaced, not just topped up. After the oil change, the vehicle's combination instrument will display a 100% oil life, which is reset by the maintenance technician and not automatically restored. As time and mileage increase, the oil's service life will gradually decrease. Under normal circumstances, maintenance can also be scheduled based on mileage. The lifespan of engine oil is determined by the distance traveled and the oil's shelf life, with different types of oil requiring different maintenance intervals. Conventional oil needs to be replaced every 6,000 to 8,000 kilometers, while synthetic oil requires replacement every 15,000 to 20,000 kilometers.
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What brand is the transmission of the Audi S4?

The Audi S4 has 2019 and 2018 models. Taking these two models as examples, the Audi S4 uses an 8-speed manual-automatic transmission. Typically, a manual-automatic transmission refers to an AT transmission with a manual mode. The term 'manual-automatic' means the transmission has a manual mode; without a manual mode, it is simply called an automatic transmission. Transmission oil replacement methods: 1. Gravity replacement. The principle of replacement is similar to that of engine oil. After loosening the tightening nut at the bottom of the oil pan, the transmission oil will automatically flow out from the drain hole. This method is the most common and easy to operate, but it cannot completely drain the transmission oil. Not all transmission oil can be discharged, mainly because the mechanical structure has dead corners such as depressions and pits. 2. Circulation machine replacement. The new transmission oil is stored inside the circulation machine, and the transmission and circulation machine are connected through pipeline interfaces. The new oil pushes out the old oil under the action of the circulation machine. This method cleans the oil circuit more thoroughly. The more new transmission oil is used, the cleaner the oil circuit becomes. Replacing the transmission oil once with a circulation machine requires about 10 liters of oil. This method takes about 1 hour. 3. Removing the oil pan to change the oil. This method replaces and cleans from the root and can also handle dirty oil filters. Removing the oil pan is a major task, and the labor cost will be significantly higher.
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