The two ?? represent the position where the number should be inserted. If no action is required, you should enter 00. Depending on the desired action, you simply need to add up the values and enter the sum.
Sure, I understand. Please provide the German text you would like me to translate into English.
+01 - Brake pad wear indicator active.
+04 - Windshield washer fluid level warning indicator active.
=05: is entered as a value.
I don't need to tell you that the whole thing is illegal.

MfG. Michael
VW Golf IV TDI GTI 4-Motion Bj.2002 MKB/GKB: ARL/FEK
VW T4 Pritsche TDI Bj.1999 MKB/GKB: AXG/AFK (Selfmade)