Manufacturers have often fitted stuff that wasn’t activated; since the introduction of drive by wire throttles cruise control has often been a simple replacement stalk and coding work to activate. Indeed I did just that on my 2007 A4 convertible. That was also built with the wiring for heated mirrors, but not heated mirrors. Swapping out the mirror glasses was all that’s was required, and just cost £20odd. I know that my F10 5 series had a number of subscription services available, though at the time 3 years use was bundled in. I think, but cant’t be sure, that my 2005 E61 5 series (which had ‘professional’ nav) also had a subscription model for real time traffic and concierge services after the initial 12 month period.
More recently, every version of the last generation A3 (2013 to 2020) was built with navigation hardware installed. If you didn’t spec nav it could be activated later by a dealer (at a cost of £500 from memory).
It could be a challenge for managing private used car sales though; look and test drive a model with all the bells and whistles, but when it’s re-registered to the new owner the manufacture is notified and they deactivate everything!
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