* Check Engine Light: This light indicates a problem that could be serious. It illuminates when the onboard diagnostic system (OBD-II) detects a fault that could affect emissions, performance, or drivability. Ignoring this light could lead to more significant damage. You should get it diagnosed promptly by a mechanic.
* Service Engine Soon Light: This light typically indicates a less urgent issue than the check engine light. It often comes on for things like needing maintenance (like an oil change or tire rotation) or a minor problem that may not immediately impact drivability. However, it's still a signal that something requires attention and shouldn't be ignored indefinitely.
In short: The check engine light usually means a more serious problem requiring immediate attention, while the "Service Engine Soon" light often suggests scheduled maintenance is due or a less critical issue. However, *it's best to have any illuminated light diagnosed by a mechanic to determine the exact cause.* The severity can vary, even between different models of the F-150 and depending on the specific code stored by the vehicle's computer.
