Why does the "Restricted Performance" light come up on my Jaguar XK R?

Question

I've just paid (another ) £113 to have my Jaguar checked out, - to no avail. Rybrook's found nothing to account for the car going into Restricted Performance Mode yet again, - for the 4th time.

The warning light comes up, and the car slows down to 50 mph and under.It labours, uphill, and I get passed by VW Beetles !!

The on-board computer shows no record of any malfunction afterwards, when I take it into Rybrook's, but also, after I've stopped and switched the engine off the car behaves perfectly.

Any ideas please?

Thank you

Answer 1

temp sensor or torque converter is going bad. just wait till failure and your garage will be able to diagnose it. in the mean tim smile and wave at the passing people.

Answer 2

How long have you been putting the cheap low-grade petrol in to save money?