What is the reason for the yellow signal light in a car?

[McJohn]

Car signal yellow light on is due to a problem in a certain part, such as transmission fault light, power steering fault light, brake system fault, etc. Car brake system fault: Car fault is a phenomenon where the car cannot perform its functions, such as difficulty in starting the engine, car malfunction, oil or water leakage, lighting system failure, etc. Common faults include sudden changes in working conditions, abnormal sounds, abnormal odors, abnormal exhaust smoke, abnormal temperature, abnormal appearance, abnormal fuel and lubricant consumption, and leakage. These common faults are often encountered during use. Solution for car signal yellow light on: Pull the car over to the side of the road, turn off the engine for 5 to 10 minutes, and do not press the brake pedal. Simply press the start button once, or turn the car key halfway to the on position without pressing the clutch. After the car is powered on, it will initiate a self-check function. Wait for 5 to 10 seconds and observe whether the fault lights on the dashboard go off, leaving only the engine fault light. If other fault lights remain on, it is necessary to go to a 4S shop or repair shop to inspect the corresponding modules and parts. If only the engine fault light remains on, start the engine again and observe whether the engine fault light still remains on.