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.

Did your vehicle's check-engine light just pop on? An OBD-II scanner can provide some direction. We tested a handful to find ...

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.

Your vehicle's OBD port is essential when diagnosing mechanical problems, but that's not all it can do.

The hand-held Equus 3100 OBD-II code reader is versatile and easy to use. Just plug it into the diagnostic port, hit the link key, and wait for the codes to flow. The owner's manual has more than ...