Ford Mustang Owner's Manual page 154

Guarding Against Exhaust Fumes
Carbon monoxide, although colorless and
odorless, is present in exhaust fumes. Take
precautions to avoid its dangerous effects.
Do not start your vehicle in a closed
garage or in other enclosed areas. Exhaust
fumes can be toxic. Always open the
garage door before you start the engine.
If you smell exhaust fumes inside your
vehicle, have your dealer inspect your
vehicle immediately. Do not drive if you
smell exhaust fumes.
Have the exhaust and body ventilation systems
checked whenever:
your vehicle is raised for service
the sound of the exhaust system changes
your vehicle has been damaged in a collision
Improve your ventilation by keeping all air inlet
vents clear of snow, leaves, and other debris.
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