Why is there a buzzing sound when turning on the car key?

[VonAbigail]

When you first turn on the ignition, the fuel pump operates for a few seconds to ensure sufficient fuel injection pressure for vehicle startup, and the self-check program runs simultaneously. It's normal for some components to make sounds, which should subside shortly. Below is relevant information about car keys: 1. Number of keys: Vehicles typically come with 2-3 keys. When handing over a new car, sales personnel usually remind owners to keep the keys safe. 2. Key code: The new car key set consists of 2-3 keys and a metal or plastic tag. This tag usually bears a series of numbers representing the key code, which service stations or manufacturers can use to replicate keys for the owner.