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.
LEGO counts 266 pieces. This inventory comes from a separate parts catalog and lists 268; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.
Before you call it missing
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
Technic Axle 5.5 with Stop [Flat Short End]WhitePart 32209Element 4120471×13
Technic Pins
6 pieces
Technic Axle Pin without Friction Ridges LengthwiseLight GrayPart 3749Element 4184168 or 4154179×2
Technic Pin without Friction Ridges LengthwiseLight GrayPart 3673Element 4184166 or 367302×4
Plates
3 pieces
Plate 2 x 2BluePart 3022Element 4613973 or 302223×2
Plate 2 x 6RedPart 3795Element 379521×1
Plates Special
2 pieces
Plate Special 2 x 2 with Pin on BottomBluePart 2476aElement 4237078 or 4170321×2
Technic Steering, Suspension and Engine
2 pieces
Technic Engine Cylinder with Side SlotsLight GrayPart 2850a×2
Transportation - Sea and Air
2 pieces
Engine - Smooth, Small 1 x 2 Side Plate [With Axle Holders]BlackPart 3475bElement 347526×2
Tiles
1 piece
Tile 1 x 2 with Red '1' PrintWhitePart 3069bpr0096Element 4121776×1
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.