5 worst kinds of used cars to buy

Red Flag #1: No Service Records

Red Flag #2: Vehicle and Accident History Issues

Red Flag #3: Mechanical Problems

A quick look under the car can reveal fluid leaks, but unless you're an expert, you'll need to have someone else do a thorough inspection to make sure it's in good working condition. A PPI, or Pre-Purchase Inspection, is performed by a neutral third party (such as a certified mechanic or automotive technician) and costs about $100 to $200.

Red Flag #4: A Problem Title

Your AutoCheck vehicle report will show any problem titles on the car's record at any point in its history -- everything from hail damage to fire damage. Most of these issues are red flags, but here's just a sampling of those to avoid at all costs: Flood titles, which means the vehicle has received extensive water damage; salvage titles, which mean an insurance company has at some point declared the car a total loss due to sustained damage; and junk titles, which mean the vehicle indicate that a vehicle is not safe enough for use and the car cannot be titled again in that state.

Red Flag #5: A Fraudulent Title

A problem-free title doesn't mean it's valid. Criminals can create counterfeit or fraudulent titles and use them to legally register and then sell stolen cars. If you buy a car without a valid title, it's the worst-case scenario -- you don't legally own the car you just bought.