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 1,977 pieces. This inventory comes from a separate parts catalog and lists 1,976; 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.
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 Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle)Black ×6Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Perpendicular 3L with 2 Pin HolesBlack ×7Dark Bluish Gray ×10Black is darker than Dark Bluish Gray.
Technic Beam 1 x 11.5 Double Bent ThickBlack ×2Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Beam 1 x 3 ThinBlack ×7Dark Bluish Gray ×18Black is darker than Dark Bluish Gray.
Technic Beam 1 x 5 ThickBlack ×6Dark Bluish Gray ×11Black is darker than Dark Bluish Gray.
Technic Beam 1 x 9 ThickBlack ×17Dark Bluish Gray ×5Black is darker than Dark Bluish Gray.
2 more look-alike pairs
Technic Beam 3 x 3 L-Shape ThinBlack ×2Dark Bluish Gray ×6Black is darker than Dark Bluish Gray.
Technic Beam 3 x 5 L-Shape ThickBlack ×4Dark Bluish Gray ×11Black is darker than Dark Bluish Gray.
Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes]Light Bluish GrayPart 14720Element 6055519×10
Technic Beam 5 x 11 with 3 x 5 Opening Frame ThickLight Bluish GrayPart 64178Element 4540797×1
Technic Beam Frame 5 x 7 with 3 x 5 Opening ThickLight Bluish GrayPart 64179Element 4539880×2
Plates Round Curved and Dishes
12 pieces
Plate Round 1 x 1 with Solid StudDark Bluish GrayPart 6141Element 42106331 spare in the box×4
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)Dark Bluish GrayPart 4032aElement 4211042×4
Dish 6 x 6 Inverted (Radar) with Solid StudsRedPart 44375bElement 6156534 or 4514799×4
Bricks Round and Cones
10 pieces
Brick Round 2 x 2 [Grill]Reddish BrownPart 92947Element 6036503×10
Tiles
10 pieces
Tile 1 x 4 with GrooveBlackPart 2431Element 243126×2
Tile 1 x 6 with GrooveBlackPart 6636Element 663626×2
Tile 1 x 8 with GrooveBlackPart 4162Element 416226×2
Tile 2 x 2 with GrooveBlackPart 3068bElement 306826×1
Tile 1 x 4 with GrooveWhitePart 2431Element 6548255 or 243101×1
Tile 1 x 8 with GrooveWhitePart 4162Element 6552110 or 416201×2
Plates Special
9 pieces
Bracket 1 x 2 - 1 x 2 InvertedBlackPart 99780Element 6020193×2
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper)BlackPart 15573Element 6092585×2
Plate Special 2 x 2 with 1 Pin Hole [Complete Underside Rib]BlackPart 10247Element 6061032×3
Plate Special 1 x 2 with Pin Hole UnderneathLight Bluish GrayPart 18677Element 6168633 or 6089147×2
Technic Special
9 pieces
Technic Linear Actuator Mini with Dark Bluish Gray Head and Orange AxleLight Bluish GrayPart 92693Element 6221464 or 4612100×3
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside]Light Bluish GrayPart 41669Element 6149991×3
Technic Changeover Catch - + openingRedPart 6641Element 6099696 or 4270473×3
Wheels and Tyres
9 pieces
Tyre 107 x 44 TractorBlackPart 23798Element 6141782×4
Wheel 11 x 8 with Center GrooveLight Bluish GrayPart 42610Element 4211758×1
Wheel 56 x 34 Technic Racing Medium with 6 Pin HolesRedPart 15038Element 6276853 or 6149984×4
Bricks Curved
6 pieces
Brick Curved 2 x 4 x 2/3 No Studs, with Bottom TubesBlackPart 88930Element 4587844×2
Brick Curved 2 x 2 x 2/3LimePart 15068Element 6138661×2
Brick Curved 3 x 1 No StudsLimePart 50950Element 4537928×2
Plates
6 pieces
Plate 1 x 10BlackPart 4477Element 447726×2
Plate 1 x 2BlackPart 3023Element 302326×2
Plate 1 x 2LimePart 3023Element 4164037 or 4122439×2
Tiles Special
4 pieces
Tile Special Round 2 x 2 with HoleDark Bluish GrayPart 15535Element 6055313×4
Bars, Ladders and Fences
3 pieces
Bar Holder with ClipBlackPart 11090Element 6315887 or 6015891×1
Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki EyeTrans-OrangePart 58176Element 6507868 or 6171764×2
Pneumatics
3 pieces
Pneumatic Hose Connector with Axle ConnectorDark Bluish GrayPart 99021Element 6265669 or 6020189×3
Electronics
2 pieces
Battery Box, Power Functions 4 x 11 x 7 with Orange Switch and Dark Bluish Gray Covers [Complete Assembly] [New Version]Light Bluish GrayPart 16511Element 6368436 or 6257768×1
Motor, Medium, Power Functions, 3 x 6 x 3 with Dark Bluish Gray Bottom and 20cm WireLight Bluish GrayPart 58120Element 6209881 or 6151440×1
Flags, Banners and Signs
2 pieces
Flag 2 x 2 Square, Flat Clip Edge [Thick Clips]WhitePart 11055Element 6011794×2
Tubes and Hoses
2 pieces
Axle Hose, Soft 16LLimePart 32202Element 6303399 or 6149976×2
Stickers
1 piece
Sticker Sheet for Set 42054-1[No Color/Any Color]Part 28214Element 6182609 or 6161280×1
Technic Bricks
1 piece
Technic Brick 1 x 2 [2 Pin Holes]BlackPart 32000Element 3200026×1
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.