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 1,368 pieces. This inventory comes from a separate parts catalog and lists 1,366; 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 Plate 1 x 5 with Toothed Ends, 2 Studs and Center Axle HoleWhitePart 2711Element 4240272 or 4240244×2
Technic Plate 2 x 4 [3 Holes]WhitePart 3709Element 370901×8
Technic Slope Long 1 x 6 with 3 Pin HolesWhitePart 2744Element 6167025 or 4528417×8
Tile 1 x 1 with GrooveWhitePart 3070bElement 6550138 or 3070011 spare in the box×2
Tile 1 x 2 with GrooveWhitePart 3069bElement 6548264 or 306901×6
Tile 1 x 4 with GrooveWhitePart 2431Element 6548255 or 243101×7
Tile Round 2 x 2 with Bottom CrossWhitePart 4150Element 415051 or 415001×2
Wedge Plate 3 x 3 Cut CornerWhitePart 2450Element 6601842 or 4280148×2
Wedge Plate 3 x 4 without Stud NotchesWhitePart 4859Element 4215973 or 4199395×2
Wedge Plate 3 x 6 Cut CornersWhitePart 2419Element 6552090 or 241901×2
Wheel with Split Axle holeWhitePart 3482Element 4279395 or 4194244×6
Yellow
27 pieces
Plate 1 x 4YellowPart 3710Element 371024×4
Seat / Chair 2 x 2YellowPart 4079×2
Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle)YellowPart 6553Element 655324×5
Technic Beam 1 x 4 Thin with Stud ConnectorYellowPart 2825Element 4107135 or 282524×8
Technic Beam Triangle Thin [Type I]YellowPart 2905Element 4296140 or 4251461×2
Technic Plate 2 x 4 [3 Holes]YellowPart 3709Element 370924×4
Technic Wedge Belt Wheel [aka Pulley]YellowPart 4185Element 6636439 or 6363273×2
Dark Gray
19 pieces
Technic Axle 3 with StudDark GrayPart 6587Element 4113884 or 658727×4
Technic Gear 16 Tooth with Clutch [Toothed]Dark GrayPart 6542aElement 654277 or 654227×7
Technic Pin 3/4Dark GrayPart 32002Element 41098541 spare in the box×8
Red
10 pieces
Motor Cover, 9V Micromotor 2 x 2 BaseRedPart 2985Element 4109830 or 298521×2
Motor, 9V Micromotor 2 x 2RedPart 2986Element 70823×1
Technic Rubber Belt Medium [24mm ID] [Round Cross Section]RedPart 85544Element 4544145 or 4544143×7
Trans-Clear
8 pieces
Cable, Fiber OpticsTrans-ClearPart 6640Element 4109999 or 664040×8
[No Color/Any Color]
1 piece
Sticker Sheet for Set 8480-1[No Color/Any Color]Part 71320Element 4100356×1
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.