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.

When your check engine light comes on, it is a warning that something is wrong with your vehicle. Here are five of the most likely causes to check for.

The check engine light is your car’s way of alerting you that something's amiss — but it could be as minor as a loose gas cap, or more serious, like a faulty oxygen sensor. Repair costs for ...

Some HP monitors and laptops, such as the EliteBook, feature an ambient light sensor. This sensor detects the light level of the environment and adjusts the screen's brightness accordingly. If you ...

The oxygen sensor was replaced but the 'check engine' light won't go out. Now what? Which octane fuel is best? AAA's Car Doctor has answers.

The built-in ambient light sensor in some Asus laptops detects the light level in an area and automatically adjusts the screen's brightness. But if you're giving a presentation or trying to ...

The folks at CarMD are back with their 2021 Vehicle Health Index, which documents what causes your car’s dreaded check-engine light to illuminate.

The oxygen sensor was replaced but the 'check engine' light won't go out. Now what? Which octane fuel is best? AAA's Car Doctor has answers.