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 1,585 pieces. This inventory comes from a separate parts catalog and lists 1,584; 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 and Pin Connector Perpendicular 3L with 2 Pin HolesBlack ×8Dark Blue ×14Black is yellower and darker than Dark Blue.
Technic Beam 1 x 11 ThickBlack ×1Dark Blue ×24Black is yellower and darker than Dark Blue.
Technic Axle and Pin Connector Perpendicular Double SplitBlack ×11Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Perpendicular DoubleRedPart 32291Element 6280393 or 4241474×4
Technic Axle and Pin Connector Perpendicular Double SplitRedPart 41678Element 4173975×2
Technic Beam 1 x 11 ThickRedPart 32525Element 4562805 or 4534913×16
Technic Beam 1 x 13 ThickRedPart 41239Element 4522938 or 4262082×10
Technic Beam 1 x 15 ThickRedPart 32278Element 4542575 or 4163147×10
Technic Beam 1 x 2 ThickRedPart 43857Element 4185664×6
Technic Beam 1 x 3 ThickRedPart 32523Element 4153718×2
Technic Beam 1 x 3 ThinRedPart 6632Element 6364451 or 4107824×5
Technic Beam 1 x 5 ThickRedPart 32316Element 4142132 or 4128589×13
Technic Beam 1 x 7 ThickRedPart 32524Element 4495933 or 4162098×6
Technic Beam 1 x 9 ThickRedPart 40490Element 4645733 or 4192225×9
Technic Beam 2 x 4 L-Shape ThickRedPart 32140Element 6271827 or 4141270×29
Technic Beam 3 x 5 L-Shape ThickRedPart 32526Element 4143154×5
Technic BushRedPart 3713Element 6271820 or 42271551 spare in the box×10
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]RedPart 32054Element 4140806 or 4125198×6
Dark Blue
83 pieces
Technic Axle and Pin Connector Perpendicular 3L with 2 Pin HolesDark BluePart 42003Element 6166864 or 6059015Also in Black×14
Technic Beam 1 x 11 ThickDark BluePart 32525Element 6151077 or 6059006Also in Black×24
Technic Beam 1 x 15 ThickDark BluePart 32278Element 6151070 or 6058997×10
Technic Beam 3 x 5 L-Shape ThickDark BluePart 32526Element 6217683 or 6059010×6
Technic Panel 5 x 11 x 1Dark BluePart 64782Element 6151067 or 6059012×6
Technic Panel Curved 11 x 3 with 10 Pin Holes through Panel SurfaceDark BluePart 11954Element 6096335 or 6059026×3
Technic Panel Fairing #1 Small Smooth Short, Side ADark BluePart 87080Element 6174850 or 6059018×3
Technic Panel Fairing #2 Small Smooth Short, Side BDark BluePart 87086Element 6174851 or 6059020×3
Technic Panel Fairing #5 Long Smooth, Side ADark BluePart 64681Element 6218007 or 6059022×3
Technic Panel Fairing #6 Long Smooth, Side BDark BluePart 64393Element 6218005 or 6059025×3
Tile 1 x 2 with GrooveDark BluePart 3069bElement 6554190 or 4528488×2
Tile 1 x 8 with GrooveDark BluePart 4162Element 4507080 or 4264587×1
Tile Special 1 x 2 Grille with Bottom GrooveDark BluePart 2412bElement 6022579 or 4507076×5
Tan
63 pieces
Brick Curved 3 x 1 No StudsTanPart 50950Element 4625867 or 4624088×4
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)TanPart 54200Element 4516055 or 42780691 spare in the box×4
Brick Sloped 30° 1 x 2 x 2/3TanPart 85984Element 4624086×2
Plate 1 x 2TanPart 3023Element 4113917 or 302305×6
Plate 4 x 4TanPart 3031Element 4243824 or 4113919×2
Technic Axle 4 with Centre StopTanPart 99008Element 4666999×9
Technic Axle Pin without Friction Ridges LengthwiseTanPart 3749Element 4666579 or 4186017×1
Technic Brick 1 x 4 [3 Pin Holes]TanPart 3701Element 4234365 or 370105×4
Technic Gear 12 Tooth BevelTanPart 6589Element 4565452 or 45145561 spare in the box×6
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 2 [X Opening]TanPart 32269Element 4514555×13
Technic Pin 3/4TanPart 32002Element 6663097 or 60139382 spares in the box×3
Technic Pin Long without Friction RidgesTanPart 32556×5
Tile 2 x 2 with GrooveTanPart 3068bElement 4185177 or 4114002×4
Dark Bluish Gray
28 pieces
Hook with TowballDark Bluish GrayPart 30395Element 30395199 or 6347464×1
Technic Axle 4 with StopDark Bluish GrayPart 87083Element 6083620 or 4560177×9
Technic Axle 5.5 with Stop [Rounded Short End]Dark Bluish GrayPart 59426Element 4508553×3
Technic Axle 8 with StopDark Bluish GrayPart 55013Element 4499858×4
Technic Axle and Pin Connector Perpendicular Double SplitDark Bluish GrayPart 41678Element 4234599Also in Black×2
Technic Gear Differential with Inner Tabs and Closed Center, 28 Bevel Teeth [Beveled Edge]Dark Bluish GrayPart 62821bElement 4562210 or 4525184×2
Technic Reel 3 x 2Dark Bluish GrayPart 32012Element 32012199 or 4239891×1
Technic Steering Ball Joint Large ReceptacleDark Bluish GrayPart 92911Element 4610380×2
Technic Steering Hub for Portal AxleDark Bluish GrayPart 92909Element 4610378×4
Metallic Silver
24 pieces
Technic Beam 1 x 7 ThickMetallic SilverPart 32524Element 6062519×4
Technic Beam 1 x 9 Bent (7 - 3) ThickMetallic SilverPart 32271Element 6062520×6
Technic Pin Connector Round [Slotted]Metallic SilverPart 62462Element 6542283 or 6204673×10
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside]Metallic SilverPart 41669Element 6062740 or 6062739×2
Tile Special 1 x 2 Grille with Bottom GrooveMetallic SilverPart 2412bElement 6051422 or 4579833×2
White
23 pieces
Technic Beam 1 x 11 ThickWhitePart 32525Element 6028103 or 4296265×5
Technic Beam 1 x 15 ThickWhitePart 32278Element 4542578 or 4227533×1
Technic Beam 1 x 3 ThickWhitePart 32523Element 6632140 or 4208160×4
Technic Beam 1 x 5 ThickWhitePart 32316Element 4249021 or 4140465×2
Technic Beam 3 x 5 L-Shape ThickWhitePart 32526Element 6632144 or 4585040×4
Technic Gear 24 Tooth Clutch with Dark Bluish Gray CenterWhitePart 76244Element 6198486 or 6036892×1
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside]WhitePart 41669Element 4173941×2
Tile 2 x 4 with 'EK xxxxx of 20000' License Plate PrintWhitePart 87079pr0061Element 6062547×1
Tile Special 1 x 2 Grille with Bottom GrooveWhitePart 2412bElement 6601902 or 241201×3
Yellow
16 pieces
Technic Beam 1 x 5 ThinYellowPart 32017Element 4503425 or 4199343×1
Technic Beam 1 x 7 ThickYellowPart 32524Element 4495934 or 4187082×2
Technic Beam Triangle Thin [Type II]YellowPart 99773Element 6331435 or 6010863×5
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedYellowPart 32123bElement 6271167 or 32123241 spare in the box×4
Technic Shock Absorber 9.5L with Extra Hard SpringYellowPart 95292c01Element 6083113 or 4619319×4
Trans-Clear
8 pieces
Plate Round 1 x 1 with Solid StudTrans-ClearPart 6141Element 6514052 or 62400301 spare in the box×4
Plate Round 2 x 2 with Rounded Bottom [Boat Stud]Trans-ClearPart 2654Element 6581772 or 6163901×4
Trans-Red
6 pieces
Tile 1 x 2 with GrooveTrans-RedPart 3069bElement 6514220 or 6251290×6
Dark Tan
3 pieces
Technic Axle 3 with StudDark TanPart 6587Element 6031821 or 6013821×3
Trans-Orange
2 pieces
Tile 1 x 2 with GrooveTrans-OrangePart 3069bElement 6514225 or 6251306×2
Orange
1 piece
Tile Special 1 x 2 Grille with Bottom GrooveOrangePart 2412bElement 4125254 or 3933106×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 41999-1[No Color/Any Color]Part 16629Element 6062620×1
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.