Hi. I have a jaguar XJ8 2000. When driving along I am intermittently getting a message on the dashboard Reduced Performance. When i was accelerating past a car just building up speed it happened and the car got on like it was on kangaroo juice. I have noticed sounds that I am not sure are connected. I hear a squealing sound as if a belt is slipping. But I don't notice it all the time. I hear short growling/roaring sound a few seconds on a few seconds off. Again not sure if connected. Crusing at 70mph for 70 80 miles not a problem no messages. But driving on A roads at slower speeds 40 - 50mph the message comes on regularly. Me thinking that it is a transmission issue because it is having to change gear continually. Anybody any ideas or have had this before

 

Welcome to the forum kevin897,

I've moved your question from UK & Eire Region to X308 forum. Members here with the same model will be able to help.

Please follow this link New Member Area - Intro a MUST - Jaguar Forums - Jaguar Enthusiasts Forum to the New Member Area - Intro a MUST forum and post some info about yourself and your vehicle for all members to see. In return you'll get a proper welcome and some useful advice about posting to the forum.

Graham

 

Kevin - I'd suggest buying or borrowing an OBD code reader and plug your car in to capture the fault codes. If it goes into restricted performance it logs a code that you can post on here for diagnosis. Any theories at this point are moot.