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.

The check engine light is part of your car’s so-called onboard diagnostics system. Since the 1980s, computers increasingly have controlled and monitored vehicle performance, ...

Outback has 110,000 miles on it. What maintenance is absolutely necessary? I change the filters regularly and the oil every 5 ...

Your check engine light usually comes on when your car's onboard diagnostic system has detected something wrong with your car's emission performance, with causes ranging from benign to catastrophic.

CR's experts decode oil pressure, coolant temperature, check engine, tire pressure, and traction control warnings By Benjamin Preston Every car has its own language of light-up hieroglyphics on ...

John Paul, AAA Northeast's Car Doctor, answers a question from a reader who wants a check engine light cleared.

After all, check engine lights are vague, so having a code to narrow down the problem is hugely helpful. This step could help with the next, which is taking the car in to be looked at by a ...

Q: The check engine light came on in my daughter’s 2007 Volkswagen Jetta. It has a 2.5-liter engine, automatic transmission, and only 96,000 miles. My mechanic said it was a leak in the ...

Because car diagnostic tests require specific devices and expertise to read correctly, most tests are performed by mechanics. However, you can also perform a car diagnostic test at home. Car ...

AN Irish driving instructor has revealed what you must check on your car before taking the test. You may not be able to sit ...

Every car has its own language of light-up hieroglyphics on the dashboard. They’re your car’s way of asking for help. But those lights are not always easy to interpret. What it means ...