Hidden Dangers of Push-Button Start - Consumer Reports
- Danger can arise, though, if a driver inadvertently leaves the car running when exiting the vehicle—an easy thing to do intentionally or accidentally. Even if you take the key fob with you, the engine can keep idling. If the car is parked in a closed garage attached to a house, especially a basement-level garage, carbon monoxide fumes from the idling engine may seep into the living area, possibly harming anyone in the house.
How can you not hear that the engine is still running? WTF how stupid can people be.