It is better not to park with the engine running. But if you ever have to, here are some things to know.

Caution: Idling a vehicle in an enclosed area with poor ventilation is dangerous. Engine exhaust may enter the vehicle. Engine exhaust contains Carbon Monoxide (CO) which cannot be seen or smelled. It can cause unconsciousness and even death. Never run the engine in an enclosed area that has no fresh air ventilation. For more information, see Engine Exhaust.

Caution: If the vehicle has four-wheel drive, it will be free to roll -- even if the shift lever is in P (Park) -- if the transfer case is in N (Neutral). So be sure the transfer case is in a drive gear -- not in N (Neutral). See Four-Wheel Drive .

Follow the proper steps to be sure the vehicle will not move. See Shifting Into Park .

If pulling a trailer, see Towing a Trailer .