Hall sensor replacement

Philz75

New member
My 2009 Z4 has started making the dreaded bonging noise to indicate a roof problem. Doesn’t seem to happen all the time so I scanned it and found the following error codes

A692 - hall sensor VSW5.3
A698 - top hatch open

I’ve also noticed some water behind the seats so I assume that the roof isn’t locking properly (even though it looks fine)

I’ve ordered a couple of hall sensors but from what I can see there are 4 of them. How do I know which one is at fault?
 
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