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.
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
Look-alike colors in this set
These parts appear in this set in two colors that are easy to confuse. If you are one short in one color,
check whether it went in where the other color belongs. Each color has its own element ID in the parts list
at the back of the instructions.
Technic Beam 1 x 11 ThickBlack ×7Dark Blue ×2Black is yellower and darker than Dark Blue.
Technic Beam 1 x 7 ThickBlack ×4Dark Blue ×4Black is yellower and darker than Dark Blue.
Technic Beam 2 x 3 L-Shape with Quarter Ellipse ThickBlack ×2Dark Blue ×8Black is yellower and darker than Dark Blue.
Technic Beam 2 x 4 L-Shape ThickBlack ×4Dark Blue ×2Black is yellower and darker than Dark Blue.
Technic Beam 2 x 5 L-Shape with Quarter Ellipse ThickBlack ×6Dark Blue ×2Black is yellower and darker than Dark Blue.
Technic Panel Fairing #21 5L Small Smooth, Side BBlack ×2Dark Blue ×2Black is yellower and darker than Dark Blue.
10 more look-alike pairs
Technic Panel Fairing #22 5L Small Smooth, Side ABlack ×2Dark Blue ×2Black is yellower and darker than Dark Blue.
Technic Pin Connector Hub with 1 AxleBlack ×2Dark Blue ×4Black is yellower and darker than Dark Blue.
Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge]Black ×2Dark Blue ×12Black is yellower and darker than Dark Blue.
Technic Pin Connector Hub with 2 Perpendicular AxlesBlack ×4Dark Blue ×8Black is yellower and darker than Dark Blue.
Tile 1 x 4 with GrooveBlack ×1Dark Blue ×2Black is yellower and darker than Dark Blue.
Tile 1 x 6 with GrooveBlack ×4Dark Blue ×2Black is yellower and darker than Dark Blue.
Technic Beam 1 x 5 ThickBlack ×2Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Technic Beam 2 x 4 L-Shape ThickBlack ×4Dark Bluish Gray ×8Black is darker than Dark Bluish Gray.
Technic Pin Connector Hub with 2 AxlesBlack ×6Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Pin Connector Round 1L [Beam]Black ×2Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Gear Rack 1 x 7 with Axle and Pin HolesBlackPart 87761Element 6327430 or 4562009×1
Technic Gear Differential with Inner Tabs and Closed Center, 28 Bevel Teeth [Beveled Edge]Dark Bluish GrayPart 62821bElement 4562210 or 4525184×1
Technic Gear 12 Tooth BevelTanPart 6589Element 4565452 or 4514556×4
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening]TanPart 18575Element 6346517 or 6084724×1
Plates Special
9 pieces
Plate Special 1 x 2 with Pin Hole on TopDark BluePart 11458Element 6223838×2
Bracket 1 x 1 - 1 x 2 InvertedDark Bluish GrayPart 73825Element 6336390×1
Bracket 1 x 2 - 2 x 2 InvertedLight Bluish GrayPart 99207Element 4654580×2
Bracket 1 x 2 - 1 x 2 InvertedWhitePart 99780Element 6548278 or 6070698×2
Plate Special 1 x 2 with Pin Hole on TopYellowPart 11458Element 6344181×2
Technic Bushes
9 pieces
Technic BushBlackPart 3713Element 6332148 or 6210506×1
Technic BushLight Bluish GrayPart 3713Element 6275844 or 6271817×4
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedWhitePart 32123bElement 6634562 or 6360263×4
Wheels and Tyres
8 pieces
Tyre 43.2 x 22 ZRBlackPart 44309Element 4184286×4
Wheel 30.4 x 20 without Pinholes, with Reinforced RimDark PinkPart 56145Element 6621403×4
Bricks Curved
6 pieces
Brick Curved 2 x 1 No Studs [1/2 Bow]BlackPart 11477Element 6047276×4
Brick Curved 2 x 1 No Studs [1/2 Bow]YellowPart 11477Element 6029947×2
Bricks Wedged
4 pieces
Brick Wedged, Curved 3 x 2 with Stud Notch LeftDark BluePart 80177Element 6470066×1
Brick Wedged, Curved 3 x 2 with Stud Notch RightDark BluePart 80178Element 6470085×1
Brick Wedged, Curved 2 x 1 with Stud Notch LeftDark PinkPart 29120Element 6481633×1
Brick Wedged, Curved 2 x 1 with Stud Notch RightDark PinkPart 29119Element 6481634×1
Technic Special
4 pieces
Technic Disc 3 x 3BlackPart 2723Element 4218868 or 4121619×4
Tiles Round and Curved
3 pieces
Tile Round 1 x 1 QuarterDark PinkPart 25269Element 6240462×2
Tile Round 1 x 1 with Soda Can Tab, Ring Pull PrintFlat SilverPart 98138pr0035Element 6322904 or 6117400×1
Plates Wedged
2 pieces
Wedge Plate 3 x 2 LeftBlackPart 43723Element 4180536×1
Wedge Plate 3 x 2 RightBlackPart 43722Element 4180508×1
Stickers
2 pieces
Sticker Sheet 1 for Set 42236-1[No Color/Any Color]Part 10115274Element 6580551×1
Sticker Sheet 2 for Set 42236-1[No Color/Any Color]Part 10115413Element 6581560×1
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.