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Why does the oil light come on in a diesel car but there is no lack of oil?

2 Answers
DelaneyFitz
08/29/25 2:01am
Diesel car oil light comes on but there is no lack of oil may be because the oil has not reached the oil alarm (sensor) at the moment of starting; the oil alarm is damaged, the circuit is loose, or the oil pump is not working properly. Normal oil pressure: Only normal oil pressure can ensure that the oil is delivered to all friction surfaces of the engine. Too high or too low will affect the normal operation of the engine, and even cause damage to engine components. Find the cause as soon as possible: When the oil light alarm sounds, the engine should be stopped immediately to find the cause, and work can only continue after the fault is eliminated. Avoid continuing to drive with the fault, as it contains huge safety hazards.
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Rodger
09/10/25 6:49am
The oil light is on but there's enough oil—this is quite common. I think most of the time it's due to a faulty oil pressure sensor, which is responsible for detecting pressure. If it malfunctions, it may trigger false alarms. Alternatively, the oil filter might be clogged, restricting oil flow and causing insufficient pressure. Diesel engines inherently operate at higher pressure, making aging components more prone to issues. Having driven a diesel vehicle for years, I once encountered this issue, and replacing the filter resolved it. Never ignore this—prolonged neglect could lead to insufficient lubrication, severe engine wear, and costly repairs. I recommend having the mechanic check oil pressure and sensor condition during each maintenance service to prevent many potential issues. Regular oil changes are also crucial.
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Can a driver's license be renewed in a different location?

Driver's license renewal can be processed in a different location. The motor vehicle driver should apply for renewal at the vehicle management office of the driver's license issuing location or elsewhere within 90 days before the expiration of the motor vehicle driver's license. Regulations for out-of-town driver's license renewal: Driver's license renewal can be processed at vehicle management offices nationwide without restrictions. The prerequisite is that the driver's license is about to expire. If it has already expired or been overdue for a long time, out-of-town renewal may not be accepted. Therefore, specific circumstances should be consulted with the local transportation department. If expired for more than one year but less than three years, the license will be canceled, but it can be renewed by passing the subject one exam; if expired for more than three years, the license will be invalid and cannot be renewed. Driving a motor vehicle during the expired period is not allowed, otherwise it may be treated as driving without a license. Materials required for driver's license renewal: The driver's ID card and its copy, driver's license, physical condition certificate, photo receipt, etc. Out-of-town renewal does not require providing residence or temporary residence documents. In addition, before renewing the driver's license, any traffic violations must be resolved, and the deduction points must be cleared; otherwise, the renewal will not be issued.
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How often should a sedan undergo annual inspection?

After the implementation of the new vehicle inspection regulations, sedans aged between 6 and 10 years must undergo inspection every 2 years. At the 6th and 8th year, the vehicle must be tested on the inspection line. For private vehicles over 10 years old, the original inspection cycle still applies: vehicles aged 10 to 15 years must be inspected once a year, while those over 15 years old must be inspected every 6 months. Inspection items include: Exterior inspection: Take the exterior inspection form to the exterior inspection station, where relevant documents are first checked to verify if the third-party insurance (compulsory insurance) is valid. After document verification, the exterior inspection begins, focusing on checking for damaged lights, whether the vehicle body conforms to its original condition, any changes to the suspension, as well as the sunroof, tires, etc. Line inspection: The inspection line checks the brakes, headlights (high beam), chassis, etc. This takes about 5-10 minutes. After the vehicle is driven off the line, a computer-printed form is issued, listing items such as brakes, lights, and horn. A "0" is printed for passing items, while an "X" is printed for failing items.
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What are the dimensions of a flatbed truck?

Generally speaking, flatbed trucks of the same tonnage do not necessarily have the same cargo compartment dimensions, but they fall within a certain range. Typically, the width of the cargo compartment ranges from 2.3 to 2.4 meters, while the length usually varies between 8 to 10 meters, or even up to 12.5 meters. Introduction to flatbed trucks: A flatbed truck refers to a vehicle with a cargo compartment floor that lacks guardrails, featuring a pure flat surface commonly found in large vehicles. One example is the 17.5-meter flatbed truck, with standard dimensions as follows: the cargo floor is 17.5 meters long, with widths of 2.6 meters, 2.8 meters, or 3 meters, and it is typically a high-low deck. Flatbed trucks are a common type of road transport vehicle, favored by transport companies because they facilitate the loading and unloading of large, heavy cargo and can carry more goods compared to other vehicle types of the same specifications. Classification of flatbed trucks: In the transport vehicle category, flatbed trucks are generally divided into two types: flat decks and high-low decks. Flat decks are usually between 4 to 13 meters in length, while vehicles longer than 13 meters are mostly high-low decks.
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What Causes the Continuous Noise After the Car is Turned Off?

The continuous noise after the car is turned off is the sound of the fan operating. After the vehicle is turned off, if the engine temperature is high, the cooling system will automatically activate to cool down the engine, resulting in a continuous noise even after the car is turned off. This is a normal phenomenon. Once the engine system temperature drops, the cooling system will automatically stop working, typically within 3 to 5 minutes. How the Car Cooling Fan Works: Based on the principle of electromagnetic induction, the cooling fan uses a Hall sensor component as a synchronous detection device to control a set of circuits, switching the sequence of winding energization to generate a rotating magnetic field, achieving electronic commutation in a new type of electromechanical integrated fan. The cooling fan is installed between the engine and the radiator. When the fan blades rotate driven by the engine, they generate high-speed airflow, which carries away the heat from the coolant in the radiator, thereby cooling the engine. The Function of the Car Cooling Fan: The car cooling fan is mainly used to dissipate heat from the engine, ensuring that the engine does not malfunction due to high temperatures. The car engine must be adequately cooled in high-temperature working environments to maintain it at an optimal operating temperature, ensuring good engine performance, durability, and meeting exhaust emission requirements.
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Is It Easy to Get a Driver's License If I'm Slow-Witted and Have Slow Reactions?

Whether it's easy to get a driver's license if you're slow-witted and have slow reactions depends on your learning progress. As long as you invest more time and effort, the vast majority of people can obtain a driver's license. The most important thing is that even if you're slow-witted, have poor memory, and slow reactions, you must not rush or get nervous. Instead, calm your mind and learn slowly. The C1 and C2 driver's license tests include: Subject 1: Road traffic, traffic signals, traffic safety violations and accident handling, motor vehicle driver's license application and use, motor vehicle registration regulations, and other road traffic safety laws, regulations, and rules. Subject 2: Fixed-point parking and hill start, parallel parking, curve driving, reversing into a garage, and right-angle turns. Subject 3: Starting, driving straight, gear shifting operations, lane changing, pulling over, going straight through intersections, turning left at intersections, turning right at intersections, crossing pedestrian crossings, passing school zones, passing bus stops, meeting vehicles, overtaking, U-turns, and night driving. Subject 4: Safe and civilized driving knowledge test and operational requirements, safe driving knowledge under adverse weather and complex road conditions, emergency handling methods for situations like tire blowouts, and post-accident handling knowledge.
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What to Do When a Driver Has Only 6 Points Left and Gets Another 6-Point Penalty?

If a driver has only 6 points left and receives another 6-point penalty within a single scoring cycle, their total points will reach 12. The traffic management department will then confiscate the driver's motor vehicle driving license. The driver must participate in road traffic safety laws and regulations training and take an examination as required. According to legal provisions: In China, in addition to administrative penalties for motor vehicle drivers' road traffic safety violations, a cumulative scoring system for road traffic safety violations is implemented, with a scoring cycle of 12 months. If a driver accumulates 12 points within one scoring cycle, the traffic management department of the public security authority will confiscate their motor vehicle driving license. The driver must then participate in road traffic safety laws and regulations training and take an examination as required. If the examination is passed, the points will be cleared, and the driving license will be returned. If the examination is failed, the driver must continue with the training and retake the examination. Refusal to participate in the training or take the examination as notified by the traffic management department will result in the suspension of the driver's motor vehicle driving license.
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