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 Pin Double with Axle HoleBlackPart 32138Element 4130597 or 4119589×1
Technic Pin with Friction Ridges Lengthwise and Center SlotsBlackPart 2780Element 4121715 or 278026×4
Technic Pin Long without Friction RidgesTanPart 32556×2
Technic Beams
6 pieces
Technic Beam 2 x 4 L-Shape ThickBlackPart 32140Element 6271825 or 4120017×2
Technic Beam 1 x 3 ThickLight Bluish GrayPart 32523Element 4211655×4
Technic Connectors
6 pieces
Technic Axle and Pin Connector Angled #5 - 112.5°BlackPart 32015Element 6271346 or 4107084×2
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin HoleBlackPart 32184Element 6276951 or 4121667×2
Technic Axle Connector Smooth [with x Hole + Orientation]Dark Bluish GrayPart 59443Element 6084613 or 4516546×2
Technic Beams Special
4 pieces
Technic Beam 1 x 2 with Ball Joint Straight, Smooth BallBlackPart 64276Element 4560108 or 4537514×2
Technic Beam 1 x 3 with Ball Joint in MiddleDark Bluish GrayPart 98577Element 6001085×2
Animal / Creature Body Parts
2 pieces
Animal Body Part, Barb / Claw / Tooth / Talon / Horn, MediumDark PurplePart 87747Element 6270093 or 6058227×2
Bars, Ladders and Fences
1 piece
Antenna 1 x 4 with Flat TopLight Bluish GrayPart 3957bElement 4211473×1
Plates Round Curved and Dishes
1 piece
Plate Round 2 x 2 with Rounded Bottom [Boat Stud]RedPart 2654Element 4617080 or 4278275×1
Tubes and Hoses
1 piece
Hose, Ribbed 7mm D. 3L / 2.4cmFlat SilverPart 78c03Element 6420614 or 6116017×1
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.