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.

Does a check-engine light really mean something is wrong with your engine? What you should do if yours comes on.

The check-engine light came back on again in my car. What should I do?Q. The check-engine light was on in my 2003 Ford Windstar, so I took it to a shop and they said all of the oxygen sensors were ...

A check-engine light could be a gentle reminder or a sign of something catastrophic. We explain what a malfunction indicator light is and what you can do about it.

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.

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.

If your vehicle is throwing a check engine light, but you don't have a diagnostic scanner handy, here are three tricks to try before seeing a mechanic.

Your check engine light can come on for a lot of different reasons, but there are only a few that occur after putting in gas. Here's what we know.

What Your Check Engine Light Means When your check engine light turns on, one or more onboard diagnostic trouble codes are stored in the car’s computer.

In general, five common malfunctions can cause the check engine light to come on, and some of them are simple to fix yourself. Let’s take a look at the most common issues. Your oxygen sensor ...

What Is the First Thing to Check When the Check Engine Light Comes On? Start by checking the gas cap first, since that is easy to fix. Beyond that, it’s not a good idea to try and guess what the cause ...