While it might seem like a straightforward warning light to fix, seeing "Check Fuel Cap" on your dashboard could be a sign of ...

The thing is, a gas cap does a lot more than simply close off your vehicle’s filler neck when you’re done gassing up. Your vehicle’s gas cap is part of a complex emissions control system ...

like the fuel filler neck. Besides being merely annoying, a persistent "check fuel cap" warning can result in difficult starts, a rough idle, poor engine performance, and decreased fuel economy.