Restricted Performance
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No codes were ever generated on my car when it went into RP---discovered a bad I/C pump which blew the 15A fuse. This conditione only happened when S/C was under load (climbing steep hills at 60-70 mph for over 15 min.) The RP would go away after I/C's cooled down. I was surprised that no codes were generated by this condition.
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I recently had the same problem with my 1999 xk8. It was a knock sensor causing it and the way I found it was to plug in a OBD reader and drive the car and drove it. When Restricted Performance came up I checked the reader and it came up as Knock Sensor. I am not saying that is the problem just suggesting a way to identify the problem on your car.
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You may have Jaguar enhanced codes that a generic reader is not picking up. If you do not want to invest $500 in a AutoEnginuity scanner, a trip to the dealer or independent Jaguar shop might be necessary, at least for diagnostics. P1111 is as Gus said, and not a problem.
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2000, 2001, 2008, fault, fuse, jaguar, knock, light, perfomance, performance, restricted, restriction, sensor, supercharged, xk, xkr
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