the problem is the reader coil for the imobilizer..if you have a spare key use it as the magnetic code may be a bit better condition than the high use key...a dealer will be able to either recode the 2 keys and replace the readercoil as it comes up as a hard fault on the test vas system....try and remove the key and reinsert it the next time the prob happens...hope this sheds some light on the prob and cure cheers steve
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