What does a fail safe engine mode mean on your 1999 jaguar?

A fail-safe engine mode on a 1999 Jaguar indicates that the vehicle's onboard diagnostic system has detected a malfunction, prompting it to enter a reduced performance state to protect the engine and transmission. In this mode, the car may limit power and restrict certain functions to prevent further damage. It often triggers a warning light on the dashboard, signaling the need for diagnosis and repair. Driving in fail-safe mode is typically not recommended for extended periods.