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!

The check-engine light is a signal that the onboard diagnostics system (or OBD II) has detected a malfunction in the vehicle's emissions, ignition or fuel systems.

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.

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.

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 ...

Do 'check engine' codes mean Camry needs new catalytic converter? Q: I have a 2003 Toyota Camry with the "check engine" light on. A code reader shows codes PO430 and PO420. How should I proceed?

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 ...