I installed Mk7 LED's recently, despite switching of the check number plates it still was throwing up occasional error - but MOT is looming, law of sod an error will pop up in the test.
Just tried looking for:
09 Central Electronics -> Byte 17, Bit 7
My 2006 Golf stops at Bit 6
To be absolutely sure I am going to revert to filament bulbs in the original bulb holders.