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 Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom PinRedPart 32064aElement 6196217 or 4513987×2
Technic Pin 1/2 with FrictionRedPart 89678Element 63781201 spare in the box×2
Dark Bluish Gray
24 pieces
Bracket 1 x 2 - 2 x 2 InvertedDark Bluish GrayPart 99207Element 6308045×1
Brick Special 1 x 1 x 1 2/3 with Studs on 1 SideDark Bluish GrayPart 32952Element 6228923×4
Brick Special 1 x 2 Rounded with Center BarsDark Bluish GrayPart 77808Element 6510213 or 6390673×4
Brick Special 1 x 2 with 2 Studs on 1 SideDark Bluish GrayPart 11211Element 6230233×1
Brick Special 1 x 2 with Pin - Bottom Stud HolderDark Bluish GrayPart 44865Element 6321769×2
Plate 1 x 5Dark Bluish GrayPart 78329Element 6413109×2
Plate Special 1 x 2 with End TowballDark Bluish GrayPart 22890Element 6370802 or 6338168×4
Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L AxleDark Bluish GrayPart 11214Element 6015356×2
Technic Beam 2 x 3 L-Shape with Quarter Ellipse ThickDark Bluish GrayPart 71708Element 6353303×2
Technic Brick Special 2 x 2 with Ball Socket Wide and Axle Hole, No Arm HolesDark Bluish GrayPart 67696Element 6338291×2
Blue
21 pieces
Bracket 1 x 2 - 1 x 2BluePart 99781Element 6163471×2
Plate 2 x 2BluePart 3022Element 4613973 or 302223×10
Plate 2 x 2 CornerBluePart 2420Element 242073 or 242023×2
Plate 2 x 8BluePart 3034Element 303423×2
Technic Axle Pin with Friction Ridges LengthwiseBluePart 43093Element 4309323 or 4206482×2
Technic Pin Long with Friction Ridges Lengthwise, 1 Center SlotBluePart 42924Element 6299413×2
Window 1 x 4 x 3 without Shutter TabsBluePart 60594Element 6097556 or 4597415×1
Yellow
21 pieces
Brick Curved 2 x 2 x 2/3 Two Studs and Curved Slope EndYellowPart 47457Element 4218699×2
Brick Sloped 33° 3 x 4YellowPart 3297Element 6256980 or 6088712×1
Brick Special 1 x 2 with 2 Studs on 1 SideYellowPart 11211Element 6119197×2
Brick Special 1 x 4 with 4 Studs on One SideYellowPart 30414Element 4164073 or 3041424×2
Plate 1 x 12YellowPart 60479Element 4514844×2
Plate Round 1 x 1 with Solid StudYellowPart 6141Element 6141241 spare in the box×4
Plate Special 1 x 2, Top Clip [Open O]YellowPart 44861Element 6360077×6
Plate Special 2 x 6 x 2/3 with 4 Studs on Side, 1 Support Wall on BottomYellowPart 87609Element 4567996×2
Dark Orange
18 pieces
Brick Special 1 x 2 x 1 2/3 with 8 Studs on 3 SidesDark OrangePart 67329Element 6398380×6
Brick Special 2 x 2 with Grooves and Axle HoleDark OrangePart 90258Element 6315198×1
Plate 2 x 4Dark OrangePart 3020Element 4535928 or 4164449×3
Plate Round 1 x 1 with Solid StudDark OrangePart 6141Element 63157821 spare in the box×8
Green
13 pieces
Plate 1 x 2GreenPart 3023Element 302328×6
Plate 1 x 3GreenPart 3623Element 4107758 or 362328×2
Plate 2 x 3GreenPart 3021Element 302128×4
Plate 2 x 4GreenPart 3020Element 302028×1
Bright Pink
10 pieces
Brick Curved 2 x 2 x 2/3Bright PinkPart 15068Element 6230082×1
Brick Wedged, Curved 2 x 1 with Stud Notch LeftBright PinkPart 29120Element 6460839×3
Brick Wedged, Curved 2 x 1 with Stud Notch RightBright PinkPart 29119Element 6486887×3
Plate 2 x 4Bright PinkPart 3020Element 6204535 or 4245288×1
Tile 1 x 1 with GrooveBright PinkPart 3070bElement 6251940 or 45800071 spare in the box×1
Tile 2 x 2 with GrooveBright PinkPart 3068bElement 4615728×1
Medium Azure
7 pieces
Brick Special 1 x 2 with 2 Studs on 1 SideMedium AzurePart 11211Element 6348142×7
Dark Turquoise
5 pieces
Brick and Axle Separator v2.0Dark TurquoisePart 96874Element 6254100×1
Technic Brick 1 x 2 [1 Pin Hole]Dark TurquoisePart 3700Element 6345402 or 4140338×4
Bright Green
4 pieces
Plate 2 x 6Bright GreenPart 3795Element 6399741 or 4195199×2
Plate Special 1 x 1 with Clip Horizontal [Thick Open O Clip]Bright GreenPart 61252Element 6347296 or 6172373×2
Magenta
4 pieces
Brick Round 1 x 1 Open StudMagentaPart 3062bElement 6172869×2
Cone 1 x 1 [Top Groove]MagentaPart 59900Element 6003007×2
Dark Tan
3 pieces
Plate 4 x 4 CornerDark TanPart 2639Element 6151537×2
Plate Special 4 x 6 with Trap Door Hinge [Long Pins]Dark TanPart 92099Element 4595712×1
Bright Light Yellow
2 pieces
Brick Round 3 x 3 Dome with Center StudBright Light YellowPart 49308Element 6486880×2
Nougat
2 pieces
Wheel Arch, Mudguard 2 x 3 x 1 1/3 with 2 x 2 PlateNougatPart 49097Element 6330588×2
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.