How do you remove the rear light cluster from a mk7 Ford Fiesta?

Answer 1

and bottom of the cluster housing - these are exposed when you open the boot lid. You will see carpet overlain by a plastic trim piece running up from the boot floor toward the area to the side of the light cluster. The plastic is held by a single screw toward the rear end of the vehicle - undo this screw. Now, using a flat blade slide under the plastic and over the top of the carpet trim and prise the carpet to the front exposing enough room to get your hand under the plastic and behind the light cluster. You will see (or feel) a plastic wing nut which needs to be loosened and removed. Its head is about 1 inch in diameter and it takes 15 to 20 turns to loosen. Do not drop it inside the void!!!

Pull the whole cluster away from the rear of the car then unclip the bulb housing from the plastic ouetr casing (2 grey/white clips). Change the bulb(s) as required. Re clip the bulb hosing into the rear of the glass then push the glass back into place using the 2 locating pins on the outer flank. Holding the housing, carefully replace the wing nut till finger tight, tuck the carpet trim back under the plastic and screw down then finally replace the 2 outer screws.