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Fault code FF23 in a Jaguar XJS typically indicates an issue with the engine management system, specifically relating to the fuel injection or air intake parameters. This code can suggest problems such as a faulty sensor, wiring issues, or vacuum leaks. To accurately diagnose the problem, it's advisable to check the vehicle’s service manual and possibly use a diagnostic tool to read additional codes or data. Addressing the underlying issue is crucial for optimal engine performance.

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