Why does steering wheel vibrate while parked in reverse or drive?

A vibrating steering wheel while parked in reverse or drive can be caused by several factors, including an improperly balanced or worn-out tire, misaligned wheels, or issues with the suspension system. Additionally, if the engine is idling roughly due to a malfunctioning component, it can transmit vibrations to the steering wheel. It's advisable to have a mechanic inspect the vehicle to diagnose and address the underlying issue.