A code reader for your car can mean the difference between dropping everything and heading for the mechanic and letting that warning light ride a little bit.

The Check Engine light may indicate a serious issue with your Cummins diesel engine. Here's how to check and clear the fault codes triggering that light.

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