Antenna for GPS Navigation Open Circuit Fault

[Slabber]

My 2010 4.2 TDI has a 00862 - Antenna for GPS Navigation (R50/R52) 011 - Open Circuit fault. An internet search indicates that this fault is typically associated with the navigation location being completely off by many miles, and the fix is to replace the sharkfin antenna. However navigation location is spot on in my car.

I want to fix this as I think/hope it's the cause of an ACC and Audi braking guard: Unavailable issue that I've got which coincides with this code showing up and from another internet search seems to be related.

Before I replace the sharkfin (4H0 035 503 A, £186 new) does anyone know if this fault code and an accurate navigation location are compatible? Is there anything else I can easily check before replacing the sharkfin? Thanks in advance!