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Matt
Matt, Mechanical Engineer
Category: Jaguar
Satisfied Customers: 21994
Experience:  BEng hons Mech engineering, in auto industry 22 years
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1999 XJ8. Restricted Performance message has come up on the

Resolved Question:

1999 XJ8. Restricted Performance message has come up on the dashboard. What does it mean please?
Submitted: 1 year ago.
Category: Jaguar
Expert:  Matt replied 1 year ago.
Hello On any car if you get a check engine light or other error message this typically means one or more of the sensors has failed or has a faulty connection. The ECU senses this and may put the car into 'limp home' mode which typically limits the revs and the amount of power available. Usually the car is safe to drive for a short distance as the mode is intended is intended to get you home without incurring any engine damage The quickest route to repair is to have the car plugged into a diagnostic machine which will read off the fault code stored in the ECU (providing the light is still on at this point) and indicate which sensor has failed or whether the fault is more serious. You can do a very rough and ready check yourself by unplugging sensors one at a time and seeing if any of them change the driving condition which would indicate the most recently unplugged sensor is the faulty one. This method is not foolproof though and reading a fault code off is the better method.
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