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P1111 is not a fault code. It is a special designator Jaguar uses meaning system ready, drive cycles completed after the last fault event. P1000, on the other hand, means system not ready, or drive cycles not completed after the last recorded fault event.
Some OBD II Basics - All P0xxx codes are generic and uniform across all manufacturers and mean the same on every car. All P1xxx codes are manufacturer specific codes. You cannot use a generic code chart to analyze P1xxx codes for a Jaguar.
Next time your car displays an engine fault light, try reading the codes then. If you have a CEL illuminated and the only code read is P1000 or P1111, then you probably have a fault that generic code readers cannot see. Could be a chassis code, for example.
One last thing - Neither P1000, nor P1111 can be erased.
A small leak over period time will cause fault light (amber) to come on. There is no dipstick. Can only be refilled by dealer or certified Jag Mechanic. Cost of fluid at dealer $60. Quart. Check online; $15 quart
I HAVE A 99 JAGUAR XJ8 ....I HAVE CHANGED THE BATTERY AND ALTERNATOR, BUT STILL WON'T START. SHOULD I CHANGE THE PLUGS NEXT OR THE STARTER. IT HAS 110,000 MILES. PLEASE OFFER SOME INSIGHT ON THIS SITUATION.
It's a very simple job. Disconnect battery. Disconnect electrical connector to MAF sensor. Remove (unbolt) MAF from air duct. Install new MAF. Reconnect electrical connector. Reconnect battery. Finished!