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!

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.

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 ...

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.

Did you use an OBD2 scanner on your car to figure out why the check engine light is on, only to get the P0303 code? Here's what it means, plus possible fixes.

Whether it's just from a routine scan or a result of a check engine light, discovering a P0171 could lead to various problems that have varying costs.

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 ...

Check Engine Light/Code The vehicle’s computer constantly monitors the performance and working conditions of several components.

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.