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.
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 Beam 1 x 13 ThickBlack ×26Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Beam 1 x 3 ThinBlack ×2Dark Bluish Gray ×44Black is darker than Dark Bluish Gray.
Technic Beam 1 x 5 ThickBlack ×23Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Beam 1 x 7 ThickBlack ×10Dark Bluish Gray ×8Black is darker than Dark Bluish Gray.
Technic Beam 3 x 5 L-Shape ThickBlack ×7Dark Bluish Gray ×33Black is darker than Dark Bluish Gray.
Technic Turntable Large Type 3 Top, 60 ToothBlackPart 18938Element 6109283×1
Technic Turntable Small Base, 28 ToothBlackPart 99010Element 6326620 or 4652236×1
Tile 2 x 2 with GrooveBlackPart 3068bElement 306826×2
Tile 2 x 4 with GrooveBlackPart 87079Element 4560182×2
Tile Special 1 x 2 Grille with Bottom GrooveBlackPart 2412bElement 241226×2
Tyre 62.4 x 20BlackPart 32019Element 6411639 or 4547373×12
Light Bluish Gray
691 pieces
Antenna 1 x 4 with Flat TopLight Bluish GrayPart 3957bElement 4211473×2
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
Hose, Pneumatic 4mm D. 19L / 15.2cmLight Bluish GrayPart 5102c19Element 6587919 or 6119485×1
Technic Axle and Pin Connector PerpendicularRedPart 6536Element 6261373 or 4188298×6
Technic Beam 1 x 11 ThickRedPart 32525Element 4562805 or 4534913×2
Technic Beam 1 x 15 ThickRedPart 32278Element 4542575 or 4163147×4
Technic Beam 1 x 3 ThickRedPart 32523Element 4153718×9
Technic Beam 1 x 4 ThinRedPart 32449Element 6330205 or 4141811×4
Technic Beam 1 x 7 Bent (4 - 4) ThickRedPart 32348Element 6332236 or 6278130×6
Technic Beam 1 x 7 ThickRedPart 32524Element 4495933 or 4162098×6
Technic Beam 1 x 9 Bent (6 - 4) ThickRedPart 6629Element 6534282 or 6394730×2
Technic Beam 1 x 9 ThickRedPart 40490Element 4645733 or 4192225×8
Technic Beam 2 x 4 L-Shape ThickRedPart 32140Element 6271827 or 4141270×7
Technic Changeover Catch - + openingRedPart 6641Element 6099696 or 4270473×2
Technic Gear 16 Tooth with Clutch on Both SidesRedPart 18946Element 6100930×9
Technic Gear Rack 1 x 14 x 2 HousingRedPart 18940Element 6114965×3
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole]RedPart 32054Element 4140806 or 4125198×34
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside]RedPart 41669Element 4185661×2
Tile 2 x 4 with GrooveRedPart 87079Element 4560179×4
White
65 pieces
Technic Axle and Pin Connector Angled #1WhitePart 32013Element 6332573 or 4118981×2
Technic Axle and Pin Connector Angled #2 - 180°WhitePart 32034Element 6271870 or 4125554×2
Technic Axle and Pin Connector PerpendicularWhitePart 6536Element 6261372 or 4173670×2
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin HoleWhitePart 32184Element 6276981 or 6114940×2
Technic Beam 1 x 11 ThickWhitePart 32525Element 6028103 or 4296265×3
Technic Beam 1 x 3 ThickWhitePart 32523Element 6632140 or 4208160×6
Technic Beam 1 x 4 ThinWhitePart 32449Element 6360072 or 4144138×8
Technic Beam 1 x 5 ThickWhitePart 32316Element 4249021 or 4140465×2
Technic Beam 1 x 7 ThickWhitePart 32524Element 6564912 or 6318056×13
Technic Beam 2 x 4 L-Shape ThickWhitePart 32140Element 6271824 or 4118980×3
Technic Beam 3 x 5 L-Shape ThickWhitePart 32526Element 6632144 or 4585040×4
Technic Brick 1 x 1 with Pin HoleWhitePart 6541Element 6609542 or 654101×1
Technic Driving Ring ConnectorWhitePart 18948Element 6276052 or 6100932×2
Technic Gear 24 Tooth Clutch with Dark Bluish Gray CenterWhitePart 76244Element 6198486 or 6036892×1
Technic Panel 3 x 11 x 1WhitePart 15458Element 6055627×3
Technic Panel 5 x 11 x 1WhitePart 64782Element 6004135 or 4580019×1
Technic Panel Fairing # 3 Small Smooth Long, Side AWhitePart 64683Element 4547581×1
Technic Panel Fairing # 4 Small Smooth Long, Side BWhitePart 64391Element 4547582×1
Technic Panel Fairing #21 5L Small Smooth, Side BWhitePart 11946Element 6330084 or 6114580×3
Technic Panel Fairing #22 5L Small Smooth, Side AWhitePart 11947Element 6343987 or 6114583×3
Tile 1 x 4 with GrooveWhitePart 2431Element 6548255 or 243101×2
Tan
63 pieces
Technic Axle 4 with Centre StopTanPart 99008Element 4666999×3
Technic Axle Pin without Friction Ridges LengthwiseTanPart 3749Element 4666579 or 4186017×6
Technic Engine Crankshaft CenterTanPart 2854Element 6355727 or 6013937×5
Technic Gear 12 Tooth BevelTanPart 6589Element 4565452 or 4514556×11
Technic Gear 20 Tooth BevelTanPart 32198Element 6031962 or 4514557×1
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening]TanPart 18575Element 6346517 or 6084724×15
Technic Pin 3/4TanPart 32002Element 6663097 or 60139382 spares in the box×12
Technic Pin Long without Friction RidgesTanPart 32556×10
Yellow
52 pieces
Brick Curved 3 x 1 No StudsYellowPart 50950Element 4247771×4
Plate 2 x 3YellowPart 3021Element 302124×2
Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm]YellowPart 88072Element 6261356 or 4611704×2
Pneumatic Cylinder 1 x 11 with 2 Stepped Inlets [V2]YellowPart 19476Element 6353188 or 6099775×1
Pneumatic Cylinder 1 x 5 with 2 Stepped Inlets [V2]YellowPart 19475Element 6387401 or 6207032×1
Pneumatic Cylinder 2 x 11 with 2 Stepped Inlets [V2]YellowPart 19478Element 6156699 or 6152068×2
Technic Beam 1 x 2 ThickYellowPart 43857Element 4187122×15
Technic Beam 1 x 6 ThinYellowPart 32063Element 6170294 or 6063252×8
Technic Beam 3 x 3 T-Shape ThickYellowPart 60484Element 6072627×1
Technic Engine CrankshaftYellowPart 2853Element 6640378 or 4119474×2
Technic Engine Piston RoundYellowPart 2851Element 4112203 or 285124×6
Technic Pin Connector Round [Slotted]YellowPart 62462Element 6173122 or 4526983×4
Technic Shock Absorber 6.5L with Hard Spring, Tight Coil in Middle [Complete Assembly]YellowPart 76537Element 7653726 or 6027566×4
Dark Tan
22 pieces
Technic Axle 3 with StudDark TanPart 6587Element 6031821 or 6013821×12
Technic Axle 5 with StopDark TanPart 15462Element 6055631×10
Trans-Clear
10 pieces
Plate Round 2 x 2 with Rounded Bottom [Boat Stud]Trans-ClearPart 2654Element 6581772 or 6163901×2
Tile Round 1 x 1Trans-ClearPart 98138Element 6514191 or 62747381 spare in the box×8
Trans-Orange
10 pieces
Brick Round 2 x 2 with Axle HoleTrans-OrangePart 3941Element 6514283 or 6273154×2
Plate 1 x 2Trans-OrangePart 3023Element 6514005 or 6240217×2
Plate Round 2 x 2 with Rounded Bottom [Boat Stud]Trans-OrangePart 2654Element 6513980 or 6171727×2
Tile Round 1 x 1Trans-OrangePart 98138Element 6514197 or 62747471 spare in the box×4
Trans-Red
2 pieces
Tile Round 1 x 1Trans-RedPart 98138Element 6514189 or 62586071 spare in the box×2
[No Color/Any Color]
1 piece
Sticker Sheet for Set 42043-1[No Color/Any Color]Part 23697Element 6124276×1
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.