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LEGO Missing Piece Checker

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.

24 Hours Race Car

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42039 24 Hours Race Car

1,219 pieces in 151 part and color combinations.

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.

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Piece checklist

Technic Pins 471 pieces

  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Black Part 32054 Element 4140801 or 4107742 ×4
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 5 spares in the box ×241
  • Technic Pin with Friction Ridges Lengthwise and Towball Black Part 6628 Element 4184169 or 662826 1 spare in the box ×8
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 2 spares in the box ×43
  • Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 1 spare in the box ×6
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×113
  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Dark Bluish Gray Part 11214 Element 6015356 ×21
  • Technic Axle Towball Light Bluish Gray Part 2736 Element 6443149 or 4211375 ×2
  • Technic Pin 1/2 with 2L Bar Extension Light Bluish Gray Part 61184 Element 6347715 or 4520320 ×2
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Light Bluish Gray Part 32054 Element 4211865 ×17
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×2
  • Technic Pin 3/4 Tan Part 32002 Element 6663097 or 6013938 1 spare in the box ×6
  • Technic Pin Long without Friction Ridges Tan Part 32556 ×6

Technic Beams 215 pieces

  • Technic Beam 1 x 11 Thick Black Part 32525 Element 6029578 or 4534909 ×5
  • Technic Beam 1 x 15 Thick Black Part 32278 Element 4542573 or 4128603 ×10
  • Technic Beam 1 x 4 Thin with Stud Connector Black Part 2825 Element 6331570 or 4107136 ×2
  • Technic Beam 1 x 5 Thick Black Part 32316 Element 4142135 or 4140429 ×6
  • Technic Beam 1 x 5 Thin with Axle Holes on Ends Black Part 11478 Element 6327028 or 6030286 ×12
  • Technic Beam 1 x 7 Thick Black Part 32524 Element 4495935 or 4155458 ×7
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Black Part 6629 Element 6279881 or 4119800 ×2
  • Technic Beam 1 x 9 Thick Black Part 40490 Element 4645732 or 4542788 ×12
  • Technic Beam 2 x 4 L-Shape Thick Black Part 32140 Element 6271825 or 4120017 ×18
  • Technic Beam 3 x 3 T-Shape Thick Black Part 60484 Element 4552347 or 4535771 ×14
  • Technic Beam 3 x 5 L-Shape Thick Black Part 32526 Element 4142823 or 3252626 ×5
  • Technic Beam 1 x 11 Thick Bright Green Part 32525 Element 6598705 or 6295195 ×4
  • Technic Beam 1 x 5 Thick Bright Green Part 32316 Element 6338456 or 6097393 ×6
  • Technic Beam 1 x 7 Thick Bright Green Part 32524 Element 6097392 ×6
  • Technic Beam 1 x 13 Thick Light Bluish Gray Part 41239 Element 4522934 or 4156299 ×11
  • Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Light Bluish Gray Part 60483 Element 6265089 or 6004888 ×13
  • Technic Beam 1 x 5 Thick Light Bluish Gray Part 32316 Element 4211651 ×11
  • Technic Beam 1 x 5 Thin Light Bluish Gray Part 32017 Element 4503416 or 4211554 ×4
  • Technic Beam 1 x 7 Bent (4 - 4) Thick Light Bluish Gray Part 32348 Element 6278129 or 4211668 ×1
  • Technic Beam 1 x 7 Thick Light Bluish Gray Part 32524 Element 4495930 or 4211665 ×13
  • Technic Beam 2 x 4 L-Shape Thick Light Bluish Gray Part 32140 Element 6271831 or 4211610 ×9
  • Technic Beam 3 x 5 L-Shape Thick Light Bluish Gray Part 32526 Element 4211713 ×10
  • Technic Beam 1 x 11.5 Double Bent Thick Red Part 32009 Element 6271160 or 4268653 ×2
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Red Part 6629 Element 6534282 or 6394730 ×2
  • Technic Beam 1 x 11 Thick White Part 32525 Element 6028103 or 4296265 ×1
  • Technic Beam 1 x 11.5 Double Bent Thick White Part 32009 Element 6271161 or 6004157 ×4
  • Technic Beam 1 x 13 Thick White Part 41239 Element 6634561 or 4620671 ×7
  • Technic Beam 1 x 3 Thick White Part 32523 Element 6632140 or 4208160 ×7
  • Technic Beam 1 x 5 Thick White Part 32316 Element 4249021 or 4140465 ×5
  • Technic Beam 1 x 9 Thick White Part 40490 Element 6001831 or 4156341 ×2
  • Technic Beam 2 x 4 L-Shape Thick White Part 32140 Element 6271824 or 4118980 ×4

Technic Connectors 171 pieces

  • Technic Axle Connector Smooth [with x Hole + Orientation] Black Part 59443 Element 6084612 or 4512363 ×13
  • Technic Axle and Pin Connector Angled #2 - 180° Black Part 32034 Element 6271869 or 4107783 ×5
  • Technic Axle and Pin Connector Angled #5 - 112.5° Black Part 32015 Element 6271346 or 4107084 ×2
  • Technic Axle and Pin Connector Perpendicular Black Part 6536 Element 6261371 or 4173668 ×14
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Black Part 42003 Element 6273708 or 4200326 ×10
  • Technic Axle and Pin Connector Perpendicular Triple Black Part 63869 Element 6362991 or 6007966 ×7
  • Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise Black Part 15100 Element 6073231 ×12
  • Technic Pin Connector Toggle Joint Smooth Double with Axle and Pin Holes Black Part 87408 Element 6278412 or 4558692 ×3
  • Technic Axle and Pin Connector Perpendicular Bright Green Part 6536 Element 6584470 or 6097399 ×4
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Bright Green Part 42003 Element 6097398 ×30
  • Technic Axle and Pin Connector Angled #5 - 112.5° Light Bluish Gray Part 32015 Element 6271347 or 4211551 ×4
  • Technic Axle and Pin Connector Perpendicular 3L with Pin Hole Light Bluish Gray Part 32068 Element 6273321 or 6013936 ×2
  • Technic Axle and Pin Connector Perpendicular Double Light Bluish Gray Part 32291 Element 6280396 or 4211629 ×2
  • Technic Pin Connector Hub Perpendicular 3 x 3 Bent with 4 Pins (Pin Ridges Across Part) Light Bluish Gray Part 55615 Element 4296059 ×4
  • Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Big Squared Pin Holes] Light Bluish Gray Part 87082 Element 4560175 ×6
  • Technic Pin Connector Perpendicular 2 x 2 Bent Light Bluish Gray Part 44809 Element 4211880 ×2
  • Technic Pin Connector Round [Slotted] Light Bluish Gray Part 62462 Element 6173127 or 4526985 ×4
  • Technic Axle Connector with Axle Hole Red Part 32039 Element 4118897 ×4
  • Technic Axle and Pin Connector Angled #6 - 90° Red Part 32014 Element 6268922 or 4189131 ×1
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Red Part 32184 Element 6276963 or 4128598 ×6
  • Technic Axle and Pin Connector Angled #1 White Part 32013 Element 6332573 or 4118981 ×14
  • Technic Axle and Pin Connector Angled #5 - 112.5° White Part 32015 Element 6271349 or 6003297 ×2
  • Technic Driving Ring Connector White Part 18948 Element 6276052 or 6100932 ×1
  • Technic Pin Connector Round [Slotted] White Part 62462 Element 6550164 or 6173116 ×10
  • Technic Axle Connector Smooth [with x Hole + Orientation] Yellow Part 59443 Element 4519010 ×9

Technic Axles 122 pieces

  • Technic Axle 10 Black Part 3737 Element 373726 ×1
  • Technic Axle 4 Black Part 3705 Element 370526 ×13
  • Technic Axle 6 Black Part 3706 Element 370626 ×15
  • Technic Axle 4 with Stop Dark Bluish Gray Part 87083 Element 6083620 or 4560177 ×13
  • Technic Axle 8 with Stop Dark Bluish Gray Part 55013 Element 4499858 ×1
  • Technic Axle 3 with Stud Dark Tan Part 6587 Element 6031821 or 6013821 ×5
  • Technic Axle 5 with Stop Dark Tan Part 15462 Element 6055631 ×2
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×31
  • Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×13
  • Technic Axle 7 Light Bluish Gray Part 44294 Element 44294194 or 4211805 ×8
  • Technic Axle 9 Light Bluish Gray Part 60485 Element 4535768 ×4
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×16

Technic Steering, Suspension and Engine 56 pieces

  • Technic Link 1 x 6 without Stoppers Black Part 32005a Element 4629921 or 4530733 ×4
  • Technic Steering / CV Joint Axle Dark Bluish Gray Part 92906 Element 4610374 ×2
  • Technic Steering Arm 5.5 x 2 with Towball Socket Rounded, Chamfered Dark Bluish Gray Part 57515 Element 6074651 or 4523398 ×4
  • Technic Steering Hub for Portal Axle Dark Bluish Gray Part 92909 Element 4610378 ×4
  • Technic Engine Connecting Rod Light Bluish Gray Part 2852 Element 6000018 or 4655728 ×8
  • Technic Engine Cylinder without Side Slots, with Bottom Slots Light Bluish Gray Part 2850b Element 6514436 or 6383961 ×8
  • Technic Steering / CV Joint Light Bluish Gray Part 32494 Element 6265690 or 6122217 ×4
  • Technic Steering Portal with 2 Pin Holes Light Bluish Gray Part 11950 Element 6169984 or 6022949 ×2
  • Technic Steering Portal with 2 Pin Holes and 2 Ball Joint Arms Light Bluish Gray Part 11949 Element 6022947 ×2
  • Technic Steering Wheel Small (3 Studs Diameter) Light Bluish Gray Part 2819 Element 4580510 or 4211578 ×1
  • Technic Engine Crankshaft Center Tan Part 2854 Element 6355727 or 6013937 ×3
  • Technic Engine Crankshaft Yellow Part 2853 Element 6640378 or 4119474 ×2
  • Technic Engine Piston Round Yellow Part 2851 Element 4112203 or 285124 ×8
  • Technic Shock Absorber 6.5L with Hard Spring, Tight Coil in Middle [Complete Assembly] Yellow Part 76537 Element 7653726 or 6027566 ×4

Technic Panels 47 pieces

  • Technic Panel 3 x 11 x 1 Black Part 15458 Element 6080356 ×6
  • Technic Panel 5 x 11 x 1 Black Part 64782 Element 4566243 ×2
  • Technic Panel 3 x 11 x 1 Bright Green Part 15458 Element 6584478 or 6097396 ×4
  • Technic Panel Curved 3 x 13 Bright Green Part 18944 Element 6585427 or 6097208 ×8
  • Technic Panel Fairing # 3 Small Smooth Long, Side A Bright Green Part 64683 Element 6598693 or 6097394 ×5
  • Technic Panel Fairing # 4 Small Smooth Long, Side B Bright Green Part 64391 Element 6598700 or 6097395 ×5
  • Technic Panel Fairing #5 Long Smooth, Side A Bright Green Part 64681 Element 6097386 ×2
  • Technic Panel Fairing #6 Long Smooth, Side B Bright Green Part 64393 Element 6097388 ×2
  • Technic Panel 3 x 11 x 1 White Part 15458 Element 6055627 ×1
  • Technic Panel Curved 11 x 3 with 2 Pin Holes through Panel Surface White Part 62531 Element 6004137 ×2
  • Technic Panel Fairing #1 Small Smooth Short, Side A White Part 87080 Element 4558878 ×1
  • Technic Panel Fairing #17 Large Smooth, Side A White Part 64392 Element 6023994 or 4547031 ×1
  • Technic Panel Fairing #18 Large Smooth, Side B White Part 64682 Element 6023996 or 4547025 ×1
  • Technic Panel Fairing #2 Small Smooth Short, Side B White Part 87086 Element 4558874 ×1
  • Technic Panel Fairing #5 Long Smooth, Side A White Part 64681 Element 4558802 ×3
  • Technic Panel Fairing #6 Long Smooth, Side B White Part 64393 Element 4558797 ×3

Technic Bushes 46 pieces

  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 2 spares in the box ×38
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 1 spare in the box ×8

Technic Gears 37 pieces

  • Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×6
  • Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] Black Part 18575 Element 6346535 or 6093977 ×3
  • Technic Gear Rack 1 x 7 with Axle and Pin Holes Black Part 87761 Element 6327430 or 4562009 ×1
  • Technic Knob Wheel Black Part 32072 Element 6284188 or 4248204 ×4
  • Technic Driving Ring 3L Dark Bluish Gray Part 18947 Element 6100931 ×1
  • Technic Gear 16 Tooth with Clutch [Smooth] Dark Bluish Gray Part 6542b Element 6542199 or 4237267 ×2
  • Technic Gear 24 Tooth [New Style with Single Axle Hole] Dark Bluish Gray Part 3648b Element 6133119 or 4514558 ×1
  • Technic Gear 8 Tooth [Reinforced] Dark Bluish Gray Part 10928 Element 6631413 or 6012451 ×3
  • Technic Gear Differential with Inner Tabs and Closed Center, 28 Bevel Teeth [Beveled Edge] Dark Bluish Gray Part 62821b Element 4562210 or 4525184 ×1
  • Technic Gear 16 Tooth Reinforced [New Style] Light Bluish Gray Part 94925 Element 4640536 ×4
  • Technic Worm Gear Light Bluish Gray Part 4716 Element 4211510 ×2
  • Technic Gear 16 Tooth with Clutch on Both Sides Red Part 18946 Element 6100930 ×2
  • Technic Gear 12 Tooth Bevel Tan Part 6589 Element 4565452 or 4514556 1 spare in the box ×6
  • Technic Gear 20 Tooth Bevel Tan Part 32198 Element 6031962 or 4514557 ×1

Plates Round Curved and Dishes 10 pieces

  • Dish 2 x 2 Inverted [Radar] Trans-Clear Part 4740 Element 6514246 or 6245306 ×2
  • Dish 3 x 3 Inverted [Radar] Trans-Clear Part 43898 Element 6507917 or 6244730 ×2
  • Plate Round 1 x 1 with Solid Stud Trans-Clear Part 6141 Element 6514052 or 6240030 1 spare in the box ×2
  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 1 spare in the box ×4

Technic Beams Special 8 pieces

  • Technic Beam 3 x 0.5 Liftarm with Boss and Pin / Crank Light Bluish Gray Part 33299a Element 4211688 ×4
  • Technic Beam 5 x 11 with 3 x 5 Opening Frame Thick Light Bluish Gray Part 64178 Element 4540797 ×3
  • Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick Light Bluish Gray Part 64179 Element 4539880 ×1

Wheels and Tyres 8 pieces

  • Tyre 68.8 x 36 ZR Black Part 44771 Element 6062225 or 4614801 ×4
  • Wheel 56 x 34 Technic Racing Medium with 6 Pin Holes Black Part 15038 Element 6284703 or 6253256 ×4

Tubes and Hoses 7 pieces

  • Axle Hose, Soft 11L Black Part 32199 Element 4234438 or 4121646 ×2
  • Hose, Ribbed 7mm D. 11L / 8.8cm Flat Silver Part 78c11 Element 4617492 ×2
  • Axle Hose, Soft 19L White Part 32235 Element 6102484 or 4182888 ×3

Plates 5 pieces

  • Plate 1 x 1 Light Bluish Gray Part 3024 Element 4211399 1 spare in the box ×2
  • Plate 1 x 3 Light Bluish Gray Part 3623 Element 4211429 or 3623194 ×2
  • Plate 2 x 10 Red Part 3832 Element 383221 ×1

Bricks Round and Cones 4 pieces

  • Brick Round 2 x 2 Dome Top, Hollow Stud Light Bluish Gray Part 30367c Element 4211637 ×2
  • Brick Round 2 x 2 with Axle Hole Light Bluish Gray Part 3941 Element 4211526 ×2

Bricks Curved 2 pieces

  • Brick Curved 4 x 1 No Studs [Stud Holder with Symmetric Ridges] Light Bluish Gray Part 11153 Element 6578746 or 6042950 ×2

Plates Special 2 pieces

  • Plate Special 1 x 2 with Pin Hole Underneath Light Bluish Gray Part 18677 Element 6168633 or 6089147 ×2

Technic Bricks 2 pieces

  • Technic Pin Connector Block 1 x 5 x 3 Light Bluish Gray Part 32333 Element 6271360 or 4205761 ×2

Tiles 2 pieces

  • Tile 1 x 8 with Groove Red Part 4162 Element 416221 ×2

Tiles Special 2 pieces

  • Tile Special 1 x 2 Grille with Bottom Groove Light Bluish Gray Part 2412b Element 4211350 ×2

Stickers 1 piece

  • Sticker Sheet for Set 42039-1 [No Color/Any Color] Part 19095 Element 6096193 ×1

Technic Special 1 piece

  • Technic Changeover Catch - + opening Red Part 6641 Element 6099696 or 4270473 ×1

Tick each piece as you find it, or mark it missing.

When a piece really is missing

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