Jaguar Repair Problems? Ask a Jaguar Repairs Expert.
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Based on your description it sounds like we have a problem with the electronic throttle system specifically the throttle. This cases the vehicle to go into limp mode and usually cycling the key will reset it. To be sure we will need to have the vehicle scanned for the stored fault codes. A Jag factory tool is needed to do this but we can try a generic OBD II scan tool available at your local parts store to see if we can read any faults. It will read a P followed by four digits. For example P1121. Let me know.
OK sounds good. Let me know.