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WHEN YOU SAY NEW KEY ? DOES THIS MEAN THE METAL PART ! IF SO YOU HAVE TO PLACE THE KEY IN THE IGNITION BARREL AND LET IT LINK UP TO THE NEW KEY PLUS THE CIRUIT BOARD, THEN DO THE PROGRAMMING WHERE IT DOES THE CHIMES. BUT DO IT IN A ORDER, I THINK THERE IS A LINK WHERE SOMEONE HAS EXPLAINED THIS IN ONE OF THE POST. AS FOR THE NEW CICUIT BOARD I WOULD SEE IF IT LOOKS THE SAME REGARDING TO ITS OUT LAY, AS SOME CICUIT BOARDS DIFFER. FOR ME I JUST HAD TO CHANGE THE TACTILE BUTTONS ON THE CICUIT BOARD X4 AND MINE NOW WORKS GREAT, THATS ON A 2004 X TYPE, BEST OF LUCK ...HOPE YOU GET SORTED, DAVE.

Hi. I had the same problem several times. Someone posted a reply on this forum which worked for me. After turning on the ignition, wait until all the start up lights have gone out before proceeding to start the engine. As I said, worked for me. I always used Shell VPOWER or Texaco Supreme. Again, had no issues as long as I stuck with these.

I've used V-Power ever since buying the jag 3 years ago, gives better mpg and no major DPF problems. As said above, the cat does need to be let out of the bag occasionially