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What does it mean when the DEF light is on?

1Answers
McCatherine
09/01/2025, 10:13:41 PM

DEF light on indicates that the car's auxiliary water tank is low on water. The reasons for the auxiliary water tank being low on water are: 1. There is a leak in the cooling system or a slight gasket failure in the cylinder head; 2. The coolant temperature is too high, causing the system to be low on water; 3. The water pump seizes, damaging the timing belt and causing the piston to hit the valves; 4. The cylinder head gasket fails, mixing with engine oil or being discharged through the exhaust pipe. The car's auxiliary water tank is part of the engine cooling system and serves to balance the pressure in the radiator. The maintenance methods for the auxiliary water tank are: 1. Stop and check if the temperature is too high while driving; 2. Stop immediately and check if smoke is coming from the radiator; 3. Regularly replace the coolant.

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How Long Can the Driver's License Review Be Delayed?

Review of a driver's license can be extended for up to three years. For motor vehicle drivers who are unable to process the renewal of their driver's license, review, or submission of physical condition certificates within the specified time due to reasons such as going abroad or serving in the military, they can apply for an extension at the vehicle management office where the driver's license was issued. The maximum extension period is three years. There are 16 types of driver's licenses, and the specific vehicle models they can drive are as follows: 1. A1 (Large Bus): Permitted vehicles: large passenger vehicles. Other permitted vehicle models: A3, B1, B2, C1, C2, C3, C4, M. 2. A2 (Tractor): Heavy and medium-sized full trailers and semi-trailer vehicle trains. Other permitted vehicle models: B1, B2, C1, C2, C3, C4, M. 3. A3 (City Bus): Permitted vehicles: city buses with a capacity of 10 or more passengers. Other permitted vehicle models: C1, C2, C3, C4. 4. B1 (Medium Bus): Permitted vehicles: medium passenger vehicles (including city buses with a capacity of 10 to 19 passengers).
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What is the standard garage size?

Standard garage dimensions: Width 2.5 meters, Length 5.0-5.5 meters. According to Article 4.1.5.3 of the 'Code for Design of Parking Garages' JGJ100-98: The minimum size for a small car parking space using perpendicular parking should be 5.3m (length) × 2.4m (width), with a minimum access aisle width of 5.5m in front of the parking space. According to Article 4.1.4 of the 'Code for Design of Parking Garages' JGJ100-98: The minimum distance between small cars and side walls should be 0.6m, and the minimum distance to front/rear walls should be 0.5m. Based on these regulations, the minimum indoor dimensions for a single parking garage should be: 4.8m (car length) + 0.5m (front clearance) + 0.5m (rear clearance) = 5.8m; 1.8m (car width) + 0.6m (left clearance) + 0.6m (right clearance) = 3.0m. Therefore, the minimum indoor garage size should be 5.8m×3.0m, with a minimum access aisle width of 5.5m in front of the garage.
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Can 12 points still be deducted if 11 points have already been deducted from the driver's license?

Can 12 points still be deducted if 11 points have already been deducted from the driver's license? In theory, there is no upper limit to the number of points that can be deducted from a driver's license, as most traffic violations are now recorded by electronic police, which may result in multiple violations by a single vehicle leading to high point deductions. The calculation method for the driver's license point cycle is as follows: 1. The calculation starts from the day the driver's license is first issued, with each 12-month period constituting a cycle. According to the "Regulations on the Application and Use of Motor Vehicle Driver's Licenses," Article 65, the cumulative point cycle for road traffic safety violations (i.e., the point cycle) is 12 months, with a full score of 12 points, calculated from the date the motor vehicle driver's license is first issued; 2. Depending on the severity of the road traffic safety violation, the points deducted at one time can be: 12 points, 6 points, 3 points, 2 points, or 1 point; 3. Article 66 states that for motor vehicle drivers' road traffic safety violations, penalties and point deductions are executed simultaneously. If a motor vehicle driver commits more than one violation at a time, the points should be calculated separately and accumulated.
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What to Do When the Car Key Won't Come Out After Turning Off the Engine?

When the key cannot be removed after turning off the engine, this issue is commonly seen in automatic transmission models. The main reason for the key not coming out is that the gear shift is not fully returned to the P (Park) position. Sometimes it may appear to be in place, but it hasn't actually triggered the electronic sensor, or there might be obstacles like coins in the gear slot preventing it from fully returning. In such cases, the owner should check for any foreign objects in the gear slot, remove them, start the car, and shift the gear again to ensure it is fully returned to the P position, allowing the key to be removed. Here are some additional details: 1. Car Key: A car key is a tool used to start and operate a vehicle. Modern car keys are equipped with chips, part of a magnetic chip system. The ignition lock's reading coil scans the key's chip, which contains fixed digital information. 2. Key Won't Turn: Another common issue is the inability to turn the key after inserting it. This usually happens when the steering wheel is locked due to the self-locking feature activating after parking and turning off the engine. If the wheels were not straight or the steering wheel was turned slightly after parking, the steering column lock engages, preventing the key from turning. In this situation, gently turn the key with your right hand while simultaneously wiggling the steering wheel left and right with your left hand to release the lock and allow the key to turn.
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How Long to Prepare for Driver's License Subject One?

Generally, practicing for about a week is sufficient to take the test. Seven days after registration and medical examination, you become eligible to apply for Subject One. Subject One requires personal online appointment or notification from the instructor for exam scheduling. Below is some information about the driver's license test: 1. Subject One: Road traffic safety laws, regulations, and related knowledge test, written exam, computer-based, full score of 100, passing score of 90 or above (including 90). 2. Subject Two: Field driving skills test, practical driving in a designated area, only pass or fail, including reverse parking, parallel parking, S-curve, right-angle turn, and hill start and stop. These five items are mandatory and conducted in sequence, full score of 100, passing score of 80 or above (including 80). 3. Subject Three: Road driving skills test, practical driving on roads or simulated areas, full score of 100, passing scores: large buses 90 or above, large trucks 80 or above, other vehicle types 70 or above. 4. Subject Four: Safe and civilized driving related knowledge, written exam, full score of 100, passing score of 90 or above (including 90).
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Can I apply for a driver's license on my own?

You can apply for a driver's license on your own. On December 10, 2015, the General Office of the State Council forwarded the "Opinions on Promoting the Reform of the Motor Vehicle Driver Training and Examination System" issued by the Ministry of Public Security and the Ministry of Transport, proposing that pilot programs for self-study and direct examination of small car drivers be implemented in eligible areas, and that cross-regional examination, license renewal, replacement, and review be fully liberalized, striving to make it more convenient and efficient for the public to learn to drive and obtain a license. Relevant information about the driver's license examination is as follows: 1. Introduction: The driver's examination is a qualification test organized by the Vehicle Management Office of the Public Security Bureau. Only by passing the driver's examination can one obtain a driver's license and legally operate a motor vehicle. 2. Content: The examination for motor vehicle drivers is divided into the subject of road traffic safety laws, regulations, and related knowledge (also known as the "theoretical test", referred to as "Subject One"), the subject of field driving skills (commonly known as the "stake test", referred to as "Subject Two"), and the subject of road driving skills and safe and civilized driving common sense (commonly known as the "road test", referred to as "Subject Three"). The examination content and passing standards are uniform nationwide, with corresponding examination items specified according to different types of vehicles permitted to drive.
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