See also:

Why didn’t my air bag go off in a collision? (Inflation and non-inflation conditions of the air bag)
There are many types of accidents in which the air bag would not be expected to provide additional protection. These include rear impacts, second or third collisions in multiple impact accidents, ...

Block the Wheel
Block the wheel that is diagonally opposite from the flat to keep the vehicle from rolling when the car is raised on the jack. ...

Spark plugs
Make sure to install new spark plugs of the correct heat range. ...