When changing the bulbs in the tail lights on my '00 Golf I noticed there was an extra bulb socket on each light assembly. It's on the bottom farthest away from the center on each assembly. The rear light housing has a piece of plastic blocking a bulb from being pushed in and consequently from being put in the associated bulb socket.
Why is there this extra bulb socket and what are the details for it?
Why is there this extra bulb socket and what are the details for it?