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What Causes the Engine Light to Stay On?

1 Answers
MacTeagan
07/30/25 5:46am
The engine light stays on due to: 1. Substandard exhaust emissions: such as poor fuel quality, failed catalytic converter, excessive carbon buildup in the intake manifold, clogged fuel injectors, failed oxygen sensors, or occasional engine misfires; 2. Malfunction light activation caused by poor engine system performance; 3. Some vehicle transmission system faults are also indicated via the engine fault light. The engine fault indicator light displays the working condition of the vehicle's engine. During startup self-check, the engine fault light illuminates and should turn off automatically if the engine operates normally. If the light remains on after startup, it indicates potential mechanical issues with the engine. There are numerous possible causes for this persistent illumination, making self-diagnosis generally difficult. It is recommended to stop the vehicle and seek professional inspection promptly.
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More Forum Discussions

Why does the Volkswagen's fan keep running after parking?

It is abnormal for the Volkswagen Tiguan's radiator fan to keep running continuously. The continuous operation of the electric fan may be caused by high radiator temperature and ongoing heat dissipation, or it could be due to a faulty thermostat causing the electric fan to run continuously. The electric fan turns on when the temperature rises and stops running once the radiator cools down to a certain level. Normal state after vehicle shutdown: Generally, after the vehicle is turned off, the engine cooling system continues to dissipate heat from the engine, so the fan may run for a while longer. If the air conditioning was used in summer, this duration may be even longer. If the fan still doesn’t stop after an extended period, contact your local 4S store for inspection and repair. Self-diagnosis of the fault: Start the engine and let it idle, then check if the electric fan is not running. After turning off the ignition, observe that the electric fan does not operate initially, but about 1 minute later, it starts running at high speed. The fault is indeed present.
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Is It Normal to Buy 2019 Tires in 2021?

It is not normal to buy 2019 tires in 2021. Tires that have been in storage for over a year are considered stock tires, and tires that have been in storage for three years are expired. The rubber in these tires has aged, significantly reducing comfort and making them prone to cracking. Their heat dissipation performance also deteriorates, greatly affecting both acceleration and braking. High-speed driving with such tires increases the risk of blowouts, seriously endangering the safety of the vehicle owner's life and property. Below is some relevant information about tires: Check the tire's expiration date: The sidewall of the tire will have a four-digit number indicating the manufacturing date, with the first two digits representing the week and the last two digits representing the year. Generally, tires should not be used for more than three years or exceed 60,000 kilometers in mileage. Pay attention to the sidewall: As the tire rubber gradually ages, deep cracks may appear on the sidewall. However, as long as the sidewall has not been impacted and the cords are not broken, the tire can still be used.
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How Many Liters of Transmission Fluid Need to Be Replaced?

Transmission fluid needs to be replaced with 6 to 7 liters. Transmission fluid helps keep the gear system clean and plays a role in lubricating and prolonging the lifespan of the transmission components. Signs that indicate the need for transmission fluid replacement include: 1. Vehicle shaking and jerky gear shifting; 2. The dashboard showing a high-temperature transmission warning; 3. The car stalling; 4. Unusual noises. The functions of a car transmission are: 1. Changing the transmission ratio; 2. Expanding the torque and speed of the driving wheels; 3. Enabling the car to reverse; 4. Facilitating gear shifting or power output in the transmission. Methods for maintaining a car transmission include: 1. Regularly checking the fluid level; 2. Avoiding skipping gears when upshifting; 3. Not forcing the transmission into neutral; 4. Not reducing the idle warm-up time; 5. Avoiding gear grinding when shifting.
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Where are the drain holes located on the BMW 3 Series?

The BMW 3 Series has four sunroof drain tubes, all located in the pillars beside the front and rear windshields. The radiator drain outlet of the BMW 3 Series is at the bottom of the radiator. Method to drain the radiator: To drain the radiator of the BMW 3 Series, lift the vehicle, remove the engine underguard, and then pull out the drain plug at the lower left corner of the radiator to release the water. Consequences of clogged sunroof drain holes: Damp interior panels are a sign of clogged sunroof drain holes. If the sunroof drain tubes detach, it can also cause the interior panels to become damp. A damp interior not only produces unpleasant mildew odors but also fosters bacterial growth. In severe cases, accumulated water may flow along the roof to the sunroof motor inside the vehicle. If the sunroof motor is used while powered under these conditions, it can short-circuit and burn out.
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Where is the license plate 'Shaanxi S' from?

Shaanxi S is the license plate for the Shaanxi Military District. The license plate codes for various regions in Shaanxi Province are as follows: Shaanxi A is for Xi'an, Shaanxi B is for Tongchuan, Shaanxi C is for Baoji, Shaanxi D is for Xianyang, Shaanxi E is for Weinan, Shaanxi F is for Hanzhong, Shaanxi G is for Ankang, Shaanxi H is for Shangluo, Shaanxi J is for Yan'an, Shaanxi K is for Yulin, and Shaanxi V is for Yangling Agricultural Hi-Tech Industries Demonstration Zone. The functions of license plates are: 1. To number and register information for each vehicle; 2. To identify the region to which the vehicle belongs; 3. To trace the owner and registration information of the vehicle based on the license plate. Types of license plates: 1. White represents military and police plates; 2. Blue represents ordinary small vehicles with fewer than 7 seats; 3. Yellow represents ordinary large vehicles; 4. Black represents foreign enterprise plates.
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What is the matching method for the handbrake module of the Southeast DX7?

The matching method for the handbrake module of the Southeast DX7 is as follows: 1. Adjust the ignition switch to the OK position, then insert the decoder into the decoding port and enter the chassis system; 2. Enter the electronic parking system, input 07 to proceed, and the computer will issue a command to open the solenoid valve; 3. After the sub-pump pressure is released, input 08 to open the solenoid valve. Taking the 2020 Southeast DX7 as an example, it belongs to the compact SUV category, with body dimensions of: length 4570mm, width 1905mm, height 1720mm, wheelbase 2700mm, and a fuel tank capacity of 55L. The 2020 Southeast DX7 is equipped with a 1.5T turbocharged engine, delivering a maximum horsepower of 197PS, maximum power of 145kW, maximum torque of 285Nm, and is paired with a 7-speed dual-clutch transmission.
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