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

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How to Use a Scan Tool There are countless scan tools on the market today. Some are available from major retailers for less than $30, while other, professional-grade offerings can cost thousands.

This scanner features a 2.8-inch screen and supports all major OBD2 protocols, meaning it can read the codes for most vehicles on the road that have an OBD2 port.

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Already an affordable option, right now you can save over $25 on this diagnostic code reader from trusted brand Ancel.

Over the years OBD systems have become more sophisticated and. OBD-II is a standard for digital communications port in cars to provide real-time data and standardized diagnostic trouble codes (DTCs).

We'll explain how to use an OBDII code reader to clear Cummins fault codes, and we'll also explain how to clear the codes if you don't have access to a scan tool.

Check out how to read OBD-II engine codes and learn what they all mean. Get all the details here in this month's issue of Turbo & High-Tech Performance.