In many cases, it's safe to keep driving when a solid check engine light turns on, but it's a sign to get the car diagnosed ...

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.

Uh-oh. A warning light has turned on in your car. What should you do? Thankfully the Car Doctor, John Paul from AAA Northeast, has the answers.