Why is the engine preheating light always on?

[McDante]

If the engine preheating light remains illuminated, it indicates a fault in the engine, such as sensor failure, engine wiring issues, or engine control system malfunction. It is necessary to promptly inspect and repair at a maintenance facility to resolve the issue. Engine maintenance methods include: 1. Using qualified engine oil; 2. Using qualified coolant and antifreeze; 3. Regularly cleaning the radiator scale; 4. Periodically removing engine carbon deposits; 5. Regularly replacing the vehicle's three filters; 6. Maintaining a reasonable engine speed. Precautions for engine preheating: 1. Both electronic fuel injection diesel engines and direct injection diesel engines require preheating; 2. The engine preheating time is limited; 3. Avoid starting the engine too frequently in a cold state; 4. During engine preheating, check for any abnormal phenomena in the engine's related components and operation.