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What Causes the EPC Light on the Car Dashboard to Illuminate?

1 Answers
LeJaxon
07/29/25 4:59pm
The EPC indicator light can illuminate in two scenarios: during the power-on self-test and under other conditions. The power-on self-test is an indication that the vehicle is checking the status of all sensors before driving. Generally, if the vehicle is not started after power-on, the light will turn off by itself after about 3 seconds. If the EPC indicator light remains illuminated under other conditions or does not turn off for an extended period after the vehicle is started, the possible causes include faults in the engine intake system, throttle body, fuel system, engine, ECU control unit, or brake lights. Below is a detailed explanation of the reasons for the EPC light illuminating under other conditions: Engine intake system fault: The EPC light will illuminate if the engine intake is obstructed or insufficient. Throttle body fault: Carbon buildup is a common issue with the throttle body. Additionally, dirt accumulation can affect intake and trigger the indicator light. Fuel system fault: This includes situations such as substandard fuel, degraded fuel, or poor fuel atomization. Engine fault: Insufficient engine pressure or issues with the intake valves and other powertrain components can also cause the EPC light to illuminate. ECU control unit fault: This may involve interference with the vehicle's computer signals or false alarms from the computer. Brake light fault: This includes scenarios like brake lights not working, faulty brake switches, or brake circuit issues. Solutions for the EPC light illumination: Troubleshoot the intake system, use fuel with the appropriate octane rating, clean the throttle body, etc.
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Can I still renew my driver's license if I fail the vision test during the medical examination?

Renewing a driver's license is not allowed if you fail the vision test during the medical examination. The renewal and verification must meet the following conditions: Holders of large passenger vehicle, tractor, city bus, medium-sized passenger vehicle, or large truck driver's licenses must have no demerit points in the current scoring cycle, or holders of other types of driver's licenses must have fewer than 12 demerit points in the current scoring cycle; Holders of large passenger vehicle, tractor, city bus, medium-sized passenger vehicle, or large truck driver's licenses who have demerit points in a scoring cycle, as well as holders of other types of driver's licenses who have been involved in a traffic accident resulting in death and bear equal or greater responsibility but have not had their driver's license revoked, must have completed the verification education; The applicant must have no pending road traffic safety violations or traffic accidents; The applicant's physical condition must meet the driving license requirements; The driver's license must not be under circumstances of being legally seized, detained, temporarily suspended, revoked, canceled, or annulled.
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What are the functions of the various gears in a manual transmission car?

Manual transmission gear functions are introduced as follows: 1. First gear is the starting gear, used when the car begins moving from a complete stop. Another meaning of the starting gear is that it's only used for starting - once the car starts moving, you need to shift to second gear. 2. Second gear is the driving gear, used when the car is moving at very low speeds. This means as long as the car is moving slowly without stopping, you can use this gear (not for high-speed driving). Some vehicles with higher idle speeds can even start moving in second or third gear by pressing the accelerator, though this operation is not recommended. 3. Third gear is the acceleration gear. Starting from this gear, you can use the accelerator to increase speed and bring the car to a certain velocity. 4. Fourth gear is the medium-high speed driving gear. On most urban roads (excluding elevated roads), this is generally the highest gear needed. Depending on the vehicle, it's typically used when maintaining speeds around 60-70 km/h. 5. Fifth gear is the high-speed gear, used only on elevated roads or highways, generally at speeds of 80 km/h or above. 6. R gear is the reverse gear, used when backing up the car.
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Is Replacing the Valve Cover Gasket Considered a Major Overhaul?

Replacing the valve cover gasket is not considered a major overhaul. The valve cover gasket is a wearable component of a car, and due to aging or other reasons, it may become loose or detached, leading to oil leakage from the valve cover. Therefore, it is essential to inspect the valve cover gasket regularly. The engine valve cover primarily serves a sealing function to prevent oil leaks. It should be inspected every 20,000 kilometers, and if worn, it should be replaced promptly. A faulty valve cover gasket can easily cause oil leakage from the valve cover, posing safety hazards. There are two main reasons for valve cover oil leakage: poor assembly process and aging of the valve cover gasket. 1. Poor assembly process: If there are issues during the assembly of the valve cover, it can easily deform under pressure, leading to oil leakage. In such cases, the valve cover should be reassembled, and if necessary, replaced with a new one. 2. Aging of the valve cover gasket: When a car has been owned for too many years or has been driven for an extended mileage, the aging of the valve cover gasket is a normal occurrence. In this situation, simply replacing the valve cover gasket and sealing ring will suffice.
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What are the criteria for choosing between recirculation and fresh air mode in car air conditioning?

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Can I continue driving if the front wheels cross the line during a yellow light that turns red?

If the vehicle has already crossed the stop line when the light turns yellow, it can continue driving and it is not considered running a red light. According to regulations, when the yellow light is on, vehicles that have already crossed the stop line can continue to pass. Running a red light is determined by three photos: one showing the front of the vehicle crossing the stop line during the red light, one showing the rear of the vehicle crossing the stop line, and one showing the entire vehicle completely passing the crosswalk. All three conditions must be met to be considered running a red light. According to Article 38 of the 'Regulations for the Implementation of the Road Traffic Safety Law of the People's Republic of China': 1. When the green light is on: vehicles are allowed to pass, but turning vehicles must not hinder the passage of straight-moving vehicles and pedestrians; 2. When the yellow light is on: vehicles that have already crossed the stop line can continue to pass; 3. When the red light is on: vehicles are prohibited from passing.
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How many hours does it take to replace a timing belt?

Generally, it takes about 2-3 hours to replace a timing belt. The cost for replacing a timing belt, an alternator belt, and a tensioner pulley is usually around 600-800 RMB. If the water pump has issues and needs to be replaced together, including maintenance and labor fees, the total cost would be around 1000-1500 RMB. Once the timing belt shows signs of aging or cracking, it must be replaced immediately. It is recommended to replace the timing belt every 80,000-100,000 kilometers. Replacing a timing belt requires certain technical skills and methods. For those who are skilled and wish to replace the timing belt themselves, here is a brief introduction to the replacement process: 1. Rotate the crankshaft pulley to align the pulley notch with the protrusion on the oil pump housing, adjusting the timing point. 2. Remove the crankshaft pulley bolt and the crankshaft pulley. 3. Remove the timing belt lower cover and the guide pulley. 4. Remove the timing belt tensioner pulley and the belt; Installation: When installing the belt, ensure it is tight and not loose. After aligning the timing point, use a hex wrench to adjust the pointer and tighten the tensioner pulley. Use a socket to rotate the crankshaft clockwise twice to ensure the timing points are accurately aligned.
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