Jaguar S-Type engine light on with limited performance warning on Jaguar S-Type

Some Jaguar S-Type owners report experiencing issues when the engine light activates alongside a "restricted performance" warning, indicating potential problems that require immediate attention. These warning lights may be triggered by low coolant levels or unmetered air entering the engine, which can disrupt the fuel/air ratio. Additionally, owners have noted symptoms such as rough idling, clicking noises, and performance changes during acceleration linked to these warnings. In some instances, the warning lights appear intermittently, impacting the vehicle's performance until the root cause is addressed. Furthermore, if the issue arises during increased engine demand, it may be related to fuel quality, with some owners finding that using premium fuel or an octane booster helps resolve the restricted performance problem. Promptly addressing these warnings is crucial to prevent further damage and ensure optimal vehicle performance, and it is recommended to consult a qualified mechanic for proper diagnosis and resolution.