  Let D be a rank 2 bracket generating distribution on a 4 manifold, D is Engel
if its growth vector is maximal. When this maximality fails the distribution is
degenerate. We prove Sard's conjecture for the endpoint map in the case of
degenerate Engel distributions. In this case the set of singular horizontal
curves starting from the same point has measure zero: a full 2 dimensional
disk.
