What is that which goes with a car, comes with a car, is of no use to a car, and yet the car cannot go without it?

Why this works

This riddle plays with the dual meanings of "noise" and the relationship between a car and its operation. While a car goes along with the sound it makes—like the engine running or tires on the road—this noise is not something the car needs to function mechanically. However, without noise, a car would not be able to indicate its presence or operation to the driver and others around, making it metaphorically essential for the car's journey. Thus, noise accompanies a car, is produced by it, but isn't a functional part of its driving capability.