When your check engine light comes on, it can be tough to figure out why. Since the mid-'90s, though, most cars are made with OBD ports that make things easier.

If you have a car built in the last 30 years, your vehicle comes with a built-in diagnostic port that can make troubleshooting a problem simple.

From affordable diagnostics to tech-ready computers, we rounded up the best OBD-II scanners on the market with the help of our friends at the Gear Team.