Did you even try it?
This has as lot of info on the maf sensor. Maybe you can figure out something from this.
Air Cleaner
99660612400 mass air flow meter f >>98ys6
20414>> f 98ys6
60257>> see technical information group 2 nr. 1/00 information available.
98660612501 mass air flow meter f >>98ys6
20415>> f 98ys6
60258>> see technical information group 2 nr. 1/00