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.
Bar Holder with Clip and 90° Angle (Mechanical Leg)BlackPart 72869Element 6338384×1
Bar, Parallel Angled with 2 Connecting Bars (Train Hinge)BlackPart 37494Element 6226706×1
Hinge Plate 1 x 2 Locking with 1 Finger On End, without GrooveBlackPart 44301bElement 6266224×4
Plate Round 1 x 1 with Solid StudBlackPart 6141Element 6141261 spare in the box×4
Plate Special Round 1 x 1 with Hollow Stud and Horizontal Bar 1LBlackPart 32828Element 61965481 spare in the box×2
Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L AxleBlackPart 18651Element 6089119×2
Bright Light Orange
12 pieces
Brick Curved Inverted 2 x 1Bright Light OrangePart 24201Element 6145215×4
Plate 2 x 2Bright Light OrangePart 3022Element 6003033 or 4645047×3
Plate Angled 3 x 3 with Heart ShapeBright Light OrangePart 39613Element 6529336×1
Technic Brick 1 x 1 with Pin HoleBright Light OrangePart 6541Element 6318085×1
Tile 2 x 2 with GrooveBright Light OrangePart 3068bElement 6020147 or 4525871×1
Tile Round 1 x 2 Half CircleBright Light OrangePart 1748Element 65137721 spare in the box×2
Magenta
10 pieces
Brick Sloped 45° 2 x 2MagentaPart 3039Element 4550362×2
Plate 1 x 3MagentaPart 3623Element 6054864 or 6022048×2
Plate 2 x 2 CornerMagentaPart 2420Element 6179916 or 6101075×2
Plate 2 x 4MagentaPart 3020Element 6091608 or 6037658×4
Reddish Brown
9 pieces
Brick Special 2 x 4 with 3 Axle HolesReddish BrownPart 39789Element 6365882×1
Plate 4 x 4Reddish BrownPart 3031Element 4243838 or 4225868×1
Technic Axle 3 with StopReddish BrownPart 24316Element 6135494×1
Technic Brick 1 x 1 with Axle HoleReddish BrownPart 73230Element 6397610×2
Tile Special Round 1 x 1 with Hollow BarReddish BrownPart 20482Element 6186673 or 61629751 spare in the box×4
Medium Nougat
8 pieces
Bracket 1 x 2 - 1 x 4 [Rounded Corners at Bottom, Square Corners at Top]Medium NougatPart 28802Element 6292914 or 6273197×2
Bracket 2 x 2 with 1 x 2 Vertical StudsMedium NougatPart 41682Element 6313599×2
Plate Round 1 x 1 with Solid StudMedium NougatPart 6141Element 61676411 spare in the box×2
Plate Special 1 x 3 Rounded with 3 Open StudsMedium NougatPart 77850Element 6492538×2
Orange
8 pieces
Plate 1 x 2OrangePart 3023Element 4177932 or 4163009×5
Plate 2 x 2OrangePart 3022Element 4613982 or 4159007×1
Plate Round 1 x 1 with Solid StudOrangePart 6141Element 41571031 spare in the box×2
Bright Light Yellow
6 pieces
Bracket 1 x 1 - 1 x 1 InvertedBright Light YellowPart 36840Element 6236034×2
Plate 1 x 1Bright Light YellowPart 3024Element 6554793 or 60580141 spare in the box×2
Tile Round 1 x 1 QuarterBright Light YellowPart 25269Element 6554798 or 62289691 spare in the box×2
Green
4 pieces
Brick 2 x 2GreenPart 3003Element 300328×2
Plate 2 x 3GreenPart 3021Element 302128×2
Lime
4 pieces
Brick 1 x 3LimePart 3622Element 4166093 or 4122448×2
Brick Special 1 x 2 with 2 Studs on 1 SideLimePart 11211Element 6208291×1
Plate 1 x 4LimePart 3710Element 4187743 or 4122441×1
Dark Orange
2 pieces
Brick 1 x 2Dark OrangePart 3004Element 4579659 or 4164441×2
Dark Turquoise
2 pieces
Brick and Axle Separator v2.0Dark TurquoisePart 96874Element 6254100×1
Plate Angled 6 x 6 Heart ShapeDark TurquoisePart 46342Element 6469527×1
Trans-Clear
2 pieces
Bar Curved with Axle End and 1 x 1 Round PlateTrans-ClearPart 4042Element 6510119 or 6444527×1
Plate Round 2 x 2 with Rounded Bottom [Boat Stud]Trans-ClearPart 2654Element 6581772 or 6163901×1
Pearl Gold
1 piece
Plate Special Round 1 x 1 with Hollow Stud and Underside ClipPearl GoldPart 5264Element 65206651 spare in the box×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.