That symbol on your 2006 Ford Fusion dashboard, depicting a car with a bolt or wrench inside, likely indicates a
Check Engine Light or a variation thereof. While the exact image might differ slightly between model years, it's a common way to represent a problem detected by the car's onboard diagnostic system (OBD).
You'll need to get the code read by a mechanic or use an OBD-II scanner to determine the specific problem the car has detected. Ignoring this light can lead to further damage and expensive repairs.