* Consult your owner's manual: This is the definitive source for understanding all the warning lights and indicators on your specific model year F-250.
* Describe the light: Instead of "shaped like an engine," describe its color (e.g., amber, red, yellow), shape (e.g., circle, square, spiral), and any symbols within it (e.g., a wrench, a lightning bolt, a check engine icon). This will help identify the specific warning.
Without a clear description of the light, it's impossible to say what it means. If it's a serious warning (red light), it's best to avoid driving the truck until you've identified and addressed the problem.