1. Lock your doors

Keeping your doors locked is the first step in deterring a thief. It's good to get into the habit of checking your car doors.

2. Remove your keys from the vehicle
Never leave your keys in the ignition, says the National Insurance Crime Bureau (NICB). If your key is in the car, a thief can simply break a window and drive off. Firestone also cautions against leaving your car running, even if you're just going into a store for a quick errand. A running vehicle may be an easy mark for a thief, especially if it is unattended or unlocked.

3. Do not leave a spare key near your vehicle
The National Highway Traffic Safety Administration (NHTSA) recommends taking your keys with you when you leave your car. Some people keep a spare key under the car or in the glove box, just in case they get locked out — but thieves know where to check for an extra key. While getting locked out of your car is a pain, think about the potential hassle of your car getting stolen.

4. Close the windows
Keep your windows closed completely, says the NICB. A thief can simply reach into your car through an open window —taking what they can reach or unlocking the door to gain full access to your vehicle and everything in it.

5. Park in well-lit areas
Avoid parking in areas that are poorly lit or places that are not immediately seen by passers-by. Parking under a light and in a well-trafficked area may deter thieves if they know they can easily be seen.