Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece
and leave with the element ID LEGO asks for, or a link to buy the part.
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin HoleBlackPart 32184Element 6276951 or 4121667×1
Technic Axle Connector Smooth [with x Hole + Orientation]Dark Bluish GrayPart 59443Element 6084613 or 4516546×2
Technic Special
3 pieces
Technic Ball Joint with Through Axle HoleRedPart 53585Element 4615070 or 4543094×3
Minifig Upper Body
2 pieces
Arm Mechanical with Clip [Thick Support]OrangePart 98313Element 6014006×2
Technic Axles
2 pieces
Technic Axle 4 with StopDark Bluish GrayPart 87083Element 6083620 or 4560177×2
Technic Beams
2 pieces
Technic Beam 1 x 11.5 Double Bent ThickDark Bluish GrayPart 32009Element 6271155 or 4210668×1
Technic Beam 1 x 2 Thick with Pin Hole and Axle HoleDark Bluish GrayPart 60483Element 6265093 or 6006141×1
Technic Bushes
2 pieces
Technic BushLight Bluish GrayPart 3713Element 6275844 or 62718171 spare in the box×2
Bars, Ladders and Fences
1 piece
Bar 4L (Lightsaber Blade / Wand)Trans-RedPart 30374Element 6507880 or 6167284×1
Technic Beams Special
1 piece
Technic Beam 1 x 3 with Ball Joint in MiddleDark Bluish GrayPart 98577Element 6001085×1
Tick each piece as you find it, or mark it missing.
When a piece really is missing
Ask LEGO
LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for
the set number and each piece's element ID, the number printed beside the piece in the parts list at the back
of the instructions. This checker lists both.
Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from
older or second-hand sets.
Keep a record
Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick
pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.