Lexus GX460 Manual page 178

2-1. Driving procedures
CAUTION
Exhaust gases
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Exhaust gases include harmful carbon monoxide (CO), which is colorless and
odorless. Inhaling exhaust gases may lead to death or a serious health hazard.
If the vehicle is in a poorly ventilated area, stop the engine. In a closed area, such
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as a garage, exhaust gases may collect and enter the vehicle. This may lead to
death or a serious health hazard.
The exhaust system should be checked occasionally. If there is a hole or crack
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caused by corrosion, damage to a joint or abnormal exhaust noise, be sure to
have the vehicle inspected and repaired by your Lexus dealer. Failure to do so
may allow exhaust gases to enter the vehicle, resulting in death or a serious health
hazard.
When taking a nap in the vehicle
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Always turn the engine off. 
Otherwise, if you accidentally move the shift lever or depress the accelerator pedal,
this could cause an accident or fire due to engine overheating. Additionally, if the
vehicle is parked in a poorly ventilated area, exhaust gases may collect and enter
the vehicle, leading to death or a serious health hazard.
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GX460_U.S.A. (OM60G24U)