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Constant amber EM lite, but no codes !?

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Hey folks, so am getting the amber EM lite constantly in my E46 318 ci Auto, 69K miles, the car runs fine, no obivious issues, when I connect my OBDII scanner it starts to scan, at which point the Amber EM lite goes out (yaay!!) and the scanner then returns: no codes. After I drive the car for a while, maybe 10-15 mins, the Amber EM lite comes back on with the same results when I scan. Odd one !! Any thoughts / comments welcome, thanks !!