Is it illegal to warm up your car in certain states?

While there are no specific federal regulations that prohibit warming up a car, it is important to note that some states and localities may have their own regulations regarding idling vehicles.

For instance, in California, idling a vehicle for more than 5 minutes is generally considered a violation, and may result in a citation. Other states may have similar restrictions, so it is advisable to check the local regulations in the specific location where you intend to warm up your car.