Pretty sure that when the error pops up, you can hold the BC button for 5 seconds, and it will give you a code. There's a list of bulb codes somewhere on this forum... I forget where though. But you could always google search when it gives you that code.
What does the error look like? If it looks similar to the low beam logo, then it is low beam error, but if it looks like the tiny bulb icon that's on the front of your light switch, then it's the Parking Lamps/AE.
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