BlockTalk Find Your Set

Free tool

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.

Construction Crew

Checking

42023 Construction Crew

836 pieces in 137 part and color combinations.

LEGO counts 833 pieces. This inventory comes from a separate parts catalog and lists 836; 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.

Show

Piece checklist

Technic Pins 265 pieces

  • Technic Pin Double with Axle Hole Black Part 32138 Element 4130597 or 4119589 ×2
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 3 spares in the box ×96
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 3 spares in the box ×45
  • Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 1 spare in the box ×2
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×52
  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Dark Bluish Gray Part 11214 Element 6015356 ×8
  • Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 4 spares in the box ×16
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Light Bluish Gray Part 32054 Element 4211865 ×9
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 3 spares in the box ×9
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Red Part 32054 Element 4140806 or 4125198 ×10
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×10
  • Technic Pin 3/4 Tan Part 32002 Element 6663097 or 6013938 1 spare in the box ×1
  • Technic Pin Long without Friction Ridges Tan Part 32556 ×5

Technic Beams 170 pieces

  • Technic Beam 1 x 9 Thick Black Part 40490 Element 4645732 or 4542788 ×1
  • Technic Beam 3 x 5 L-Shape Thick Black Part 32526 Element 4142823 or 3252626 Also in Dark Bluish Gray ×4
  • Technic Beam 1 x 2 Thick Blue Part 43857 Element 6057802 or 4185665 ×6
  • Technic Beam 1 x 3 Thick Blue Part 32523 Element 4509376 or 4144284 ×4
  • Technic Beam 1 x 5 Thick Blue Part 32316 Element 4142134 or 4128591 ×7
  • Technic Beam 1 x 7 Thick Blue Part 32524 Element 4506043 or 4144285 ×3
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Blue Part 6629 Element 6279882 or 4182884 ×2
  • Technic Beam 2 x 4 L-Shape Thick Blue Part 32140 Element 6271829 or 4168114 ×3
  • Technic Beam 3 x 5 L-Shape Thick Blue Part 32526 Element 4158923 ×5
  • Technic Beam 1 x 11 Thick Dark Bluish Gray Part 32525 Element 4603472 or 4534914 ×1
  • Technic Beam 1 x 13 Thick Dark Bluish Gray Part 41239 Element 4522937 or 4261932 ×6
  • Technic Beam 1 x 15 Thick Dark Bluish Gray Part 32278 Element 32278199 or 4542576 ×2
  • Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Dark Bluish Gray Part 60483 Element 6265093 or 6006141 ×14
  • Technic Beam 1 x 3 Thick Dark Bluish Gray Part 32523 Element 32523199 or 4210751 ×5
  • Technic Beam 1 x 5 Thick Dark Bluish Gray Part 32316 Element 32316199 or 4210686 ×1
  • Technic Beam 1 x 7 Thick Dark Bluish Gray Part 32524 Element 4495931 or 4210752 ×3
  • Technic Beam 3 x 5 L-Shape Thick Dark Bluish Gray Part 32526 Element 4210753 Also in Black ×2
  • Technic Beam 1 x 13 Thick Light Bluish Gray Part 41239 Element 4522934 or 4156299 ×2
  • Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Light Bluish Gray Part 60483 Element 6265089 or 6004888 ×7
  • Technic Beam 1 x 3 Thick Light Bluish Gray Part 32523 Element 4211655 ×6
  • Technic Beam 1 x 3 Thin Light Bluish Gray Part 6632 Element 6360043 or 4211566 ×4
  • Technic Beam 1 x 4 Thin with Stud Connector Light Bluish Gray Part 2825 Element 6331574 or 4211561 ×2
  • Technic Beam 1 x 5 Thick Light Bluish Gray Part 32316 Element 4211651 ×9
  • Technic Beam 1 x 7 Thick Light Bluish Gray Part 32524 Element 4495930 or 4211665 ×4
  • Technic Beam 1 x 9 Thick Light Bluish Gray Part 40490 Element 6102449 or 4211866 ×5
  • Technic Beam 2 x 4 L-Shape Thick Light Bluish Gray Part 32140 Element 6271831 or 4211610 ×2
  • Technic Beam 3 x 3 T-Shape Thick Light Bluish Gray Part 60484 Element 4552348 or 4535772 ×6
  • Technic Beam 1 x 11 Thick Red Part 32525 Element 4562805 or 4534913 ×2
  • Technic Beam 1 x 3 Thick Red Part 32523 Element 4153718 ×4
  • Technic Beam 1 x 5 Thick Red Part 32316 Element 4142132 or 4128589 ×6
  • Technic Beam 1 x 7 Thick Red Part 32524 Element 4495933 or 4162098 ×3
  • Technic Beam 1 x 9 Bent (7 - 3) Thick Red Part 32271 Element 6276845 or 6188299 ×3
  • Technic Beam 1 x 9 Thick Red Part 40490 Element 4645733 or 4192225 ×10
  • Technic Beam 1 x 3 Thin White Part 6632 Element 6360038 or 4107826 ×2
  • Technic Beam 3 x 5 L-Shape with Quarter Ellipse Thin White Part 32250 Element 6430835 or 6063443 ×2
  • Technic Beam 1 x 11.5 Double Bent Thick Yellow Part 32009 Element 6271150 or 6257104 ×2
  • Technic Beam 1 x 13 Thick Yellow Part 41239 Element 4522935 or 4237328 ×2
  • Technic Beam 1 x 5 Thin Yellow Part 32017 Element 4503425 or 4199343 ×4
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Yellow Part 6629 Element 6524459 or 6375945 ×2
  • Technic Beam 1 x 9 Thick Yellow Part 40490 Element 6115616 or 4187136 ×2
  • Technic Beam 2 x 4 L-Shape Thick Yellow Part 32140 Element 6271828 or 4141628 ×2
  • Technic Beam 3 x 5 L-Shape with Quarter Ellipse Thin Yellow Part 32250 Element 6522621 or 6371956 ×2
  • Technic Beam Triangle Thin [Type II] Yellow Part 99773 Element 6331435 or 6010863 ×6

Technic Connectors 101 pieces

  • Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle) Black Part 6553 Element 4107765 or 655326 ×1
  • Technic Axle Connector Smooth [with x Hole + Orientation] Black Part 59443 Element 6084612 or 4512363 ×7
  • Technic Axle and Pin Connector Angled #2 - 180° Black Part 32034 Element 6271869 or 4107783 ×1
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Black Part 32184 Element 6276951 or 4121667 ×15
  • Technic Axle and Pin Connector Perpendicular Double Black Part 32291 Element 6280394 or 4140430 ×2
  • Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Big Squared Pin Holes] Black Part 87082 Element 4560174 ×2
  • Technic Pin Connector Round [Slotted] Black Part 62462 Element 6173119 or 4526982 ×1
  • Technic Pin Connector Toggle Joint Smooth Double with Axle and Pin Holes Black Part 87408 Element 6278412 or 4558692 ×1
  • Technic Axle and Pin Connector Angled #1 Blue Part 32013 Element 6332570 or 4107797 ×2
  • Technic Axle and Pin Connector Toggle Joint Smooth Blue Part 32126 Element 6457113 or 6323908 ×4
  • Technic Axle Connector Smooth [with x Hole + Orientation] Light Bluish Gray Part 59443 Element 4512360 ×2
  • Technic Axle Connector with Axle Hole Light Bluish Gray Part 32039 Element 4211553 ×8
  • Technic Axle and Pin Connector Angled #2 - 180° Light Bluish Gray Part 32034 Element 6346487 or 4211567 ×1
  • Technic Axle and Pin Connector Angled #5 - 112.5° Light Bluish Gray Part 32015 Element 6271347 or 4211551 ×2
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Light Bluish Gray Part 42003 Element 6273724 or 4211779 ×9
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Light Bluish Gray Part 32184 Element 6276969 or 4211621 ×2
  • Technic Axle and Pin Connector Perpendicular Double Split Light Bluish Gray Part 41678 Element 4211889 ×6
  • Technic Axle and Pin Connector Perpendicular Triple Light Bluish Gray Part 63869 Element 6331441 or 4538007 ×3
  • Technic Pin Connector Hub Perpendicular 3L with 4 Pins Light Bluish Gray Part 48989 Element 4225033 ×9
  • Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Big Squared Pin Holes] Light Bluish Gray Part 87082 Element 4560175 ×5
  • Technic Pin Connector Perpendicular Long Light Bluish Gray Part 32557 Element 4211714 ×1
  • Technic Pin Connector Round [Slotted] Light Bluish Gray Part 62462 Element 6173127 or 4526985 ×4
  • Technic Axle and Pin Connector Perpendicular White Part 6536 Element 6261372 or 4173670 ×1
  • Technic Axle Connector Smooth [with x Hole + Orientation] Yellow Part 59443 Element 4519010 ×3
  • Technic Axle and Pin Connector Perpendicular Yellow Part 6536 Element 6261367 or 4173666 ×6
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Yellow Part 42003 Element 6273711 or 4200324 ×3

Technic Special 84 pieces

  • Technic Digger Bucket 4 x 4 x 9 with 3 teeth Black Part 2950 Element 4562379 or 4248956 ×1
  • Technic Digger Bucket 8 x 10 Black Part 2951 Element 6023352 or 4288259 ×1
  • Technic Link Tread with Beveled Edge Black Part 15379 Element 6047885 3 spares in the box ×80
  • Technic Linear Actuator Mini with Dark Bluish Gray Head and Orange Axle Light Bluish Gray Part 92693 Element 6221464 or 4612100 ×2

Technic Axles 75 pieces

  • Technic Axle 4 Black Part 3705 Element 370526 ×5
  • Technic Axle 6 Black Part 3706 Element 370626 ×1
  • Technic Axle 4 with Stop Dark Bluish Gray Part 87083 Element 6083620 or 4560177 ×8
  • Technic Axle 5.5 with Stop [Rounded Short End] Dark Bluish Gray Part 59426 Element 4508553 ×5
  • Technic Axle 3 with Stud Dark Tan Part 6587 Element 6031821 or 6013821 ×4
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×17
  • 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 ×4
  • Technic Axle 9 Light Bluish Gray Part 60485 Element 4535768 ×6
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×10
  • Technic Axle 4 with Centre Stop Tan Part 99008 Element 4666999 ×2

Technic Bushes 35 pieces

  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 3 spares in the box ×19
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 2 spares in the box ×8
  • Technic Bush Red Part 3713 Element 6271820 or 4227155 1 spare in the box ×2
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 1 spare in the box ×6

Technic Gears 26 pieces

  • Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×4
  • Technic Turntable Small Base, 28 Tooth Black Part 99010 Element 6326620 or 4652236 ×1
  • Technic Worm Gear Black Part 4716 Element 6037533 or 471626 ×1
  • Technic Gear 24 Tooth [New Style with Single Axle Hole] Dark Bluish Gray Part 3648b Element 6133119 or 4514558 ×2
  • Technic Gear 8 Tooth [Reinforced] Dark Bluish Gray Part 10928 Element 6631413 or 6012451 ×3
  • Technic Gear 20 Tooth Bevel with Pin Hole Light Bluish Gray Part 87407 Element 4558690 ×8
  • Technic Turntable Small Top Light Bluish Gray Part 99009 Element 4652235 ×1
  • Technic Gear 12 Tooth Bevel Tan Part 6589 Element 4565452 or 4514556 3 spares in the box ×4
  • Technic Gear 20 Tooth Bevel Tan Part 32198 Element 6031962 or 4514557 ×2

Wheels and Tyres 20 pieces

  • Tyre 30.4 x 14 VR Solid Black Part 58090 Element 6601610 or 4550937 ×6
  • Tyre 49.53 x 20 Black Part 15413 Element 6518565 or 6055626 ×4
  • Wheel 18mm x 14mm with Axle Hole, Fake Bolts and Shallow Spokes Light Bluish Gray Part 55982 Element 4490127 ×6
  • Wheel 30.4 x 20 without Pinholes, with Reinforced Rim Yellow Part 56145 Element 6286380 or 4490139 ×4

Bricks Round and Cones 15 pieces

  • Brick Round 2 x 2 with Axle Hole Dark Bluish Gray Part 3941 Element 4249139 ×5
  • Brick Round 2 x 2 with Axle Hole Light Bluish Gray Part 3941 Element 4211526 ×5
  • Brick Round 2 x 2 with Axle Hole Tan Part 3941 Element 4125220 or 614305 ×5

Plates 14 pieces

  • Plate 1 x 2 Dark Bluish Gray Part 3023 Element 4211063 ×4
  • Plate 1 x 3 Dark Bluish Gray Part 3623 Element 4211133 ×2
  • Plate 2 x 2 Dark Bluish Gray Part 3022 Element 4211094 ×2
  • Plate 2 x 4 Dark Bluish Gray Part 3020 Element 4211065 ×1
  • Plate 2 x 6 Dark Bluish Gray Part 3795 Element 4211002 ×1
  • Plate 1 x 10 Red Part 4477 Element 447721 ×2
  • Plate 1 x 2 Trans-Clear Part 3023 Element 6514001 or 6240204 ×2

Plates Round Curved and Dishes 8 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Orange Part 6141 Element 6514059 or 6240227 2 spares in the box ×6
  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 1 spare in the box ×2

Technic Beams Special 7 pieces

  • Technic Beam 3 x 0.5 Liftarm with Boss and Pin / Crank Black Part 33299a Element 4156980 ×4
  • Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] Light Bluish Gray Part 14720 Element 6055519 ×3

Bricks Curved 4 pieces

  • Brick Curved 4 x 1 No Studs [Stud Holder with Symmetric Ridges] Dark Bluish Gray Part 11153 Element 6042955 ×4

Technic Steering, Suspension and Engine 3 pieces

  • Technic Engine Crankshaft Light Bluish Gray Part 2853 Element 6640384 or 4211609 ×2
  • Technic Universal Joint 3L [Complete Assembly] Light Bluish Gray Part 61903 Element 6335279 or 6321309 ×1

Bars, Ladders and Fences 2 pieces

  • Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki Eye Trans-Orange Part 58176 Element 6507868 or 6171764 ×2

Bricks Sloped 2 pieces

  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Red Part 54200 Element 6245252 or 4244363 1 spare in the box ×2

Technic Panels 2 pieces

  • Technic Panel 5 x 11 x 1 Light Bluish Gray Part 64782 Element 6474925 or 4621555 ×2

Stickers 1 piece

  • Sticker Sheet for Set 42023-1 [No Color/Any Color] Part 16139 Element 6057478 ×1

Technic Bricks 1 piece

  • Technic Brick 1 x 6 [5 Pin Holes] Dark Bluish Gray Part 3894 Element 4210917 or 3894199 ×1

Tiles 1 piece

  • Tile 2 x 2 with Groove Dark Bluish Gray Part 3068b Element 4211055 ×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.

Request a replacement from LEGO

Buy the piece

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.

We value your privacy

We use cookies 🍪 for analytics and to improve your experience. Read our privacy policy