Error 00A116 "CAR ACCESS SYSTEM CRITICAL STATUS"

[Amos94:)]

Hi everyone ,

I'm currently looking at getting an E84 X1 20d. I found a very clean one and its only reported issue is the Error as stated above. (error 00A116 CAR ACCESS SYSTEM CRITICAL STATUS)

Is this a very costly fix ? I have an excellent BMW mechanic, but he's far too busy to answer any of my questions.

Thanks in advance