Auto Theft Prevention Act This bill establishes a grant program and allows other grants to be used to combat auto theft and stolen automobile trafficking. Specifically, the bill directs the Office of Community Oriented Policing Services within the Department of Justice to award grants for state and local law enforcement agencies to combat auto theft and stolen vehicle trafficking. Grant funds must be used for specified purposes, including to purchase equipment, hire additional law enforcement officers, and provide resources and training. The bill also allows funds under the Community Oriented Policing Services grant program to be used to combat auto thefts and stolen automobile trafficking.