What is the reason for the vehicle vibration alarm but nothing is wrong?

[MacFelix]

Vehicle vibration alarm reasons are as follows: Caused by the fuel emission system: The vehicle malfunction indicator light is usually caused by the fuel emission system. When the malfunction light is on, start and turn off the vehicle, repeat this three times, and then start the vehicle again to observe whether the malfunction light remains illuminated. Caused by the engine pollution light: When the computer receives parameters from the oxygen sensor indicating that the exhaust emissions severely exceed national legal standards, and the internal program cannot adjust them back to the standard range, the engine control computer will trigger a pollution emission warning light (yellow pollution light) on the dashboard. This alerts the owner to check the cause of the engine pollution light at a service station.