My passenger side doorstep sill came off. Upon inspection, it doesn't seem to miss anything and I thought it would just snap back on, but it couldn't latch on to anything. Do you have an instruction on installing doorstep sill?
There should be four little plastic "pegs" that slide into obvious slots on the sill. These engage holes in the floor of the body. If the pegs are there, they should line up with and lock into those holes. IIRC, you do have to press pretty hard to get them to engage (or use the time-honored method of smacking the sill with your palm pretty forcefully).