The "Restricted Performance" indicator on your 2003 Jaguar S-Type typically signals an issue with the engine management system, often related to the throttle or transmission. This can be caused by various factors, including a faulty sensor, a clogged air filter, or issues with the fuel system. It's advisable to have the vehicle's diagnostic codes read to pinpoint the exact problem. Continuing to drive the vehicle in this state can lead to further damage, so it's best to seek professional assistance promptly.
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