What is the reason for three warning lights appearing when the car's power is turned on?
2 Answers
When the car's power is turned on, the appearance of three warning lights is due to the pre-start self-diagnosis performed by the vehicle's onboard computer on the engine. Here are detailed explanations about automotive engines: Overview: The automotive engine is the device that provides power to the vehicle, determining its power performance, fuel economy, stability, and environmental friendliness. Depending on the power source, automotive engines can be categorized into diesel engines, gasoline engines, electric vehicle motors, and hybrid systems, among others. Others: Common gasoline and diesel engines are both types of reciprocating piston internal combustion engines, capable of converting the chemical energy of fuel into the mechanical energy of piston movement to output power. Gasoline engines feature high rotational speed, lightweight, low noise, easy starting, and low manufacturing costs. Diesel engines have a high compression ratio, excellent thermal efficiency, and better fuel economy and emission performance compared to gasoline engines.
When the car's power is turned on, three warning lights immediately pop up, which can be quite a headache. I think the most common cause might be battery issues, such as an aging battery causing unstable voltage, which can trigger multiple warning lights. It could also be due to dirty or faulty sensors, like dust accumulation on ABS or airbag system sensors leading to false alarms. Another possibility is that the self-check system failed to pass—when the car powers on, the computer quickly checks all subsystems, and if any of them fail, the warning lights will illuminate. Additionally, short circuits in wiring or loose connectors might be the culprit, often related to rainy weather or rough driving conditions. In any case, don't ignore these lights, as they indicate potential safety risks. I recommend first checking the battery's condition—if it's old, replace it immediately. Then, try restarting the engine to see if the lights turn off. If they remain on, use an OBD scanner to read the specific fault codes, and it's best to take the car to a repair shop for a proper fix. Don't delay, as this could affect driving safety, and breaking down on the road would be even more troublesome.
