Certain components of the front steering and suspension may not be properly tightened. They could separate from each other, causing loss of vehicle control.
The power window and lock switches may stop working, and the module that controls these functions can overheat. This may cause a fire hazard.
The weight on the key ring, combined with a jarring event may cause the ignition switch to move out of the run position, turning off the engine.
Braking performance may be reduced unexpectedly.