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What does the SCR fault light mean?

1 Answers
ArielLee
07/29/25 4:06pm
When the engine SCR fault light is on, it indicates a malfunction in the corresponding component's function. Common causes for the engine SCR fault light include: Insufficient urea level (you can check the urea level yourself), NOx sensor failure, urea injector malfunction, urea injector blockage, or urea pump fault light. Here is some relevant information: 1. For such faults, professional diagnostic equipment is required. It is recommended to refer to the maintenance manual provided with the engine and visit the nearest Yuchai service station for inspection and repair. During the warranty period, Yuchai provides free repairs. 2. Selective Catalytic Reduction (SCR) is a process designed to treat NOx emissions in diesel vehicle exhaust. It involves injecting a reducing agent, such as ammonia or urea, in the presence of a catalyst to convert NOx in the exhaust into N2 and H2O.
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Why does the BMW X3 air conditioning suddenly stop cooling?

BMW X3 air conditioning not cooling can be caused by issues with the condenser, air conditioning pump, or refrigerant levels. Condenser: If there are leaks in the condenser, it can cause refrigerant leakage, leading to the air conditioning not cooling. The condenser should be replaced at a 4S shop. Air conditioning pump: Check if the air conditioning pump plug has power, and disassemble the air conditioning pump to observe whether the bearing is stuck or if the internal piston is working properly. This can help identify the cause. If the air conditioning pump is faulty, it will result in the air conditioning not cooling. Low refrigerant: If the pressure is too low, it can confirm that the air conditioning is low on refrigerant. Without sufficient refrigerant, the air conditioning will not cool. Precautions: Regularly maintain the vehicle and inspect the condenser to ensure it is functioning properly.
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How to Remove the Rear Seats of a Skoda Octavia?

Skoda Octavia rear seat removal method is as follows: 1. There are four shells around the interface of the car seat, which serve to fix the seat cushion. First, remove these four shells; 2. There are also two inverted hooks under the rear end of the seat, but they only hook the sponge and fabric. By shaking the seat, the rear seat can be completely removed. Below is relevant information about the Octavia: 1. In terms of body dimensions, the Octavia is a compact car produced by SAIC Motor, with a body length, width, and height of 4675mm, 1814mm, and 1460mm respectively, and a wheelbase of 2686mm. 2. In terms of suspension, the front suspension of the car is a MacPherson independent suspension, and the rear suspension is a torsion beam non-independent suspension.
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Where is the engine serial number located on the Buick LaCrosse?

The engine serial number of the Buick LaCrosse is located on the flywheel end of the exhaust side of the engine block. Purpose of the engine number: The engine serial number is located on the flywheel end of the exhaust side of the engine block, while the engine number label is located on the front cover of the engine. The engine number can also be found on the vehicle's registration certificate. The engine number serves as a mark to prevent unauthorized engine modifications and is required for vehicle annual inspections. Introduction to the engine number: The car engine number is the vehicle identification code, which acts as the car's ID number. It is determined according to national vehicle management standards and contains information such as the manufacturer, year, model, body type and code, engine code, assembly location, etc. The new registration certificate usually prints the VIN code in the "frame number" column.
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How to Activate the Headlight Washer on a Crown?

The Crown models equipped with headlight washers require the vehicle to be running with the headlights (either low or high beam) turned on. Then, pull and hold the windshield washer switch for 3 seconds to activate the headlight washer mode. Additional information about headlight washers is as follows: 1. The headlight washer system is primarily used on vehicles with xenon headlights. Xenon headlights offer advantages such as energy efficiency, high brightness, comfortable high color temperature, and long lifespan. However, they also have a drawback: their higher color temperature results in poorer penetration in rainy, foggy, or snowy conditions compared to halogen headlights. 2. If the headlight covers accumulate dust and dirt, the light penetration will further deteriorate, and some of the light will be absorbed. Additionally, dust particles can scatter the light, making it necessary to clean the headlights in such cases.
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What Are the Reasons for No Response When Turning the Car Key?

Here are the specific reasons why the car key may not respond when turning: 1. Incorrect gear position can also prevent the car from starting. Normally, the correct gear positions for starting an automatic transmission car are P (Park) or N (Neutral). If the gear is left in R (Reverse) or another position, not only will the car fail to start, but it can also pose a safety hazard. 2. If the issue is related to the electrical circuit, the car's failure to start can be sudden. Common faults that cause the car not to start or respond include: blown fuse, open circuit in the high-voltage coil, open circuit in the low-voltage circuit, detached central ignition wire, leaking distributor rotor, or damaged spark plugs.
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Correct Method for Automatic Transmission Start-Stop Function?

In automatic transmission vehicles, the start-stop system operates normally as soon as the engine is started. When the brake is pressed, the engine typically shuts off automatically within 1-2 seconds. Here are the drawbacks of frequently switching the start-stop system on and off: 1. Higher maintenance costs for the battery and starter: Frequent engine starts and stops can damage related components such as the starter and battery. 2. Poor user experience: Noise and vibration are more noticeable when the start-stop system activates. 3. Increased fuel consumption in traffic jams: During severe traffic congestion, the engine remains off for extended periods, causing the combustion chamber temperature to drop. Unburned hydrocarbons and paraffin can form carbon deposits on the cylinder walls. Poor fuel quality exacerbates this issue. Carbon deposits lead to higher fuel consumption and reduced power, counteracting the fuel-saving purpose of the start-stop function and instead increasing fuel usage.
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