Remember, the code reader won't tell you how to fix the check engine light—the code it reads just directs you to the fault. From there, unleash your mechanical prowess and discover the cause!

Although most check-engine malfunctions will require a code reader to diagnose, something simple to try is to make sure your gas cap is tightened — particularly if the light came on just after ...

With a code reader you might find you can simply turn off the check engine light yourself. However, if you haven’t fixed the problem, it will eventually come on again.

If you see the check engine light and haven’t filled up with fuel recently, it’s a good idea to use a code reader or take your vehicle to a shop for diagnosis.

Here are our pro tips for diagnosing a check engine light. Head to your local auto parts store and rent an OBD2 scanner to see what’s what. The staff will also help you read the code.

Consumer Reports explains what the check engine light means and what to do when you see it: how to tell if your car has a loose gas cap—or a serious engine problem.

Having a hard time interpreting the car codes your dashboard is displaying? Car codes can be confusing, so here are the best OBD2 scanners for reading, analyzing and clearing diagnostic trouble ...

In 2018 the two most common check engine repair codes were "replace ignition coil (s) and spark plug (s)" and "replace oxygen sensor" — each accounting for 5.8 percent of repairs.

I have a 2012 Kia Soul with 72,000 kilometres on the odometer, and the check-engine light is on for fuel lean at high load. I had the fuel system cleaned, a new oxygen sensor and fuel lines ...