What causes the Corolla's engine warning light to turn yellow and the car to shake?
1 Answers
When the engine warning light is on and the car body shakes, the reason is poor combustion of the air-fuel mixture. Poor combustion of the air-fuel mixture can lead to engine carbon deposits, which is the most important cause of car body shaking. At the same time, when the oxygen sensor detects poor combustion of the air-fuel mixture and reports it to the ECU, the warning light will turn on as an alert. Therefore, the engine warning light and car body shaking occur simultaneously. Issues such as spark plug failure, ignition coil failure, fuel pump failure, and fuel line blockage can all cause poor combustion of the engine's air-fuel mixture. If the engine warning light is on, you can follow these steps to address the issue: After the engine warning light turns on, first check whether the engine is running normally, whether there is shaking, black smoke, or difficulty starting. If any of these issues are present, try not to start the engine again. It is especially important not to start the engine if the light is red. If the engine is running normally and the car can be driven, please go to a service station as soon as possible to find the cause. The service station can easily read the fault code by connecting a portable diagnostic tool, obtaining targeted fault information for repair. If the engine is running normally, the owner can also try gently plugging in all wiring harness connectors, as it might be caused by a loose connection somewhere, or repeatedly turning the key to the ON position to see if the issue can be resolved.
