I recently had this light come on and took it down to the mechanic. Error codes showed a faulty breather valve and faulty ignition coil. Not sure which one triggered the light but I suspect the valve.

Just prior to that, I had both a low coolant and oil level warning come up, but neither of those triggered the warning light.

The light needs to be rest by your mechanic, or someone with the right equipment.

I've also heard the light can come up if the fuel cap isn't done up tight. In these cases, I've heard the light resets after a few start-ups.