What does the wrench emblem mean on dash of a Ford Fusion?

The wrench emblem illuminated on a Ford Fusion's dashboard indicates that your vehicle has detected a problem and requires service. It's a general warning light, not specific to a single issue. You'll need to have the car diagnosed using an OBD-II scanner (either by a mechanic or using a code reader yourself) to determine the precise cause. The wrench light often accompanies or follows other warning lights, providing more clues.