What are the common issues when the car's warning light comes on?

[DiJayden]

When the car's warning light comes on, it is generally due to a damaged sensor. Here are the relevant details: 1. If the sensor is damaged, it will transmit incorrect signals, which can also trigger the warning light. If this is the cause, simply replacing the sensor will resolve the issue. 2. If the sensor is confirmed to be functioning properly, the primary cause of exhaust emission issues is often carbon buildup, and the vehicle's carbon buildup may be quite severe. There are many reasons for carbon buildup, but the root cause is incomplete combustion of gasoline, which leaves residues inside the engine that accumulate over time and form carbon deposits. This is related to both driving habits and the quality of the fuel used. If unsuitable or low-quality gasoline is used, incomplete combustion can occur, leading to carbon buildup.