Published: June 15, 2001 1:00 a.m. ET




NEW YORK (CBS.MW) -- You've probably invested so much money in your car that it makes sense to spend a bit more to protect it against thieves. Fortunately, there are a lot of effective devices on the market.

The best car security systems disable the starter or fuel pump so a thief can't drive. If you're buying a new car, ask the dealer about factory-installed security systems. In most new cars, security devices are integrated directly into the auto's electronics, so an intrusion prompts the vehicle's computer to shut down, leaving the burglar out of luck.

Other systems let the keys talk to the car in a code that most thieves can't crack. Even the simplest systems have a remote key chain that will de-activate the security alarm and turn on the dome light as you approach the car. More sophisticated car keys have a transponder, in which the car, in effect, asks the key, "Are you the right key?" and the key responds with a code that says, "Yes, I am." You can change the code every time you use the key.

Of course, that makes losing car keys more than a little nuisance. New car keys ordered from you dealer can cost more than $100.

If you have an older car without these safety features, consider buying an alarm system that will disable the starter or the fuel injection if someone tampers with your vehicle.

Or think about installing a tracking system that is paired with a code and your vehicle identification number. If your car is stolen, notify the police and they will activate the signal and be able to find your car in most cases.

Car alarms and tracking systems vary greatly in price and quality, so look to for ratings.

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