What Causes the Car Warning Light to Illuminate?

[DeKira]

The reasons for the car warning light illuminating include coolant temperature sensor failure, crankshaft sensor failure, oxygen sensor failure, spark plug failure, ignition coil failure, etc. When the engine warning light comes on, it can be categorized into three scenarios: 1. The car cannot start, which may be due to fuel pump or ignition component failure—immediately call for assistance; 2. The warning light is on, but there are no noticeable abnormalities while driving—this might just be a sensor issue, and you can continue driving temporarily, but at low to medium speeds cautiously; 3. The engine warning light is on, the vehicle can still be driven, but experiences severe shaking, lack of acceleration power, and similar symptoms—in this case, you must stop and call for roadside assistance.