BMW 51247144878 Catch Key

Remove the trunk lid trim panel and unclip the trunk lock cylinder trim cover. Working inside the trunk at the rear of the lock cylinder, disconnect the bowden cable from the lock cylinder. Insert a 2 mm diameter punch into the hole and press down the catch, then rotate the lock release 90° counterclockwise and remove the punch. Remove the fasteners and take out the lock cylinder. For installation, reverse the removal process, ensuring to inspect and replace the lock cylinder seal if necessary, properly seat the seal, and rotate the lock release 90° clockwise once the lock is in place.