What to Do When the Car Malfunction Indicator Light Comes On?
3 Answers
When the car malfunction indicator light comes on, it indicates that there may be a mechanical issue with the engine, and you should immediately take the vehicle to a 4S shop for repair. Here are the reasons why the car malfunction indicator light may illuminate: Starting system malfunction preventing the engine from turning or turning too slowly: Insufficient battery charge, loose or severely oxidized battery terminal clamps, blown main circuit fuse, or faulty ignition switch. Ignition system malfunction: Poor performance of the ignition coil, resulting in weak or no high-voltage spark. Fuel injection system malfunction: Empty fuel tank, non-operational fuel pump or low pump pressure, leaking or deformed fuel lines, or disconnected circuit relay. Intake system malfunction: Faulty idle control valve or its control circuit, cracked idle control valve air pipe or leaking connections, or malfunctioning air flow meter.
Last time I was driving, that warning light suddenly came on, and my heart skipped a beat. I quickly pulled over to a safe spot by the roadside. This kind of light usually means the car's computer has detected an issue with some part of the vehicle, possibly the engine emission system or a sensor. At the time, I first checked the status of other indicator lights on the dashboard—the car wasn’t shaking or making strange noises—so I drove slowly to a repair shop near home. The mechanic used a diagnostic tool and found it was just a dirty oxygen sensor; cleaning it fixed the problem. It’s important to develop the habit of scanning the dashboard for any abnormal lights before starting the car. If you notice an issue, don’t push through and drive on the highway—call for a tow truck if needed, and don’t hesitate over the cost.
As someone who enjoys tinkering with cars, I've learned that when a warning light comes on, you can't just judge by appearances. First, you need to distinguish whether it's a yellow or red light. A red light means you must pull over immediately to check critical indicators like engine oil and coolant temperature. For a yellow light, you can temporarily drive at low speed to a repair shop. I always keep a simple diagnostic interface in my car - just connect it to a mobile app to read fault codes. Last time, it helped me identify carbon buildup in the throttle body. During routine maintenance, pay attention to whether sensor connectors are loose - don't wait until warning lights come on to regret it. I recommend installing a real-time monitor so you can check your vehicle's status via phone while driving.
