Diagnose auto troubles and check and reset warning lights with some of the best OBD-II scanners on the market. Many of these have been tested by the Gear Team.

It happens at the worst time - stuck in traffic or a long road trip - when you see that check engine light flick on. Here's why it may keep returning.

Did your vehicle's Check Engine light just pop on? An OBD-II scanner can provide some direction. We tested 11 of them to find the best for different situations.

Instead of paying a tech to plug an OBD-II scanner into your car and tell you what's wrong with it, you can take a look at the codes first—if you have the right OBD-II scanner.

The second character identifies whether the fault code is a generic code or a manufacturer specific code. A generic code is the same on all OBD-II equipped vehicles no matter the manufacturer.

Did your vehicle's Check Engine light just pop on? An OBD-II scanner can provide some direction. We tested 11 of them to find the best for different situations.

Plus, it has a more straightforward and standard user operation, meaning it now uses the same OBD-II port, connector, and diagnostic trouble codes for all car makes.

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

We recently got our hands on the new GoTech mobile OBD-II diagnostic tool and put it through its paces on several trucks in our fleet. The GoTech is more than just a code reader, though.

What Does Code P0442 Mean? Engine code P0442 means a small leakage in the evaporative emission control system. It is not a critical problem, but it could be annoying and cause something more serious.

Diagnose auto troubles and check and reset warning lights with some of the best OBD-II scanners on the market. Many of these have been tested by the Gear Team.