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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.

Computer Science & AI Kit K-2

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45520 Computer Science & AI Kit K-2

264 pieces in 76 part and color combinations, plus 4 minifigures.

The official piece count includes the 12 parts inside the set's minifigures, which this inventory lists separately. 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.

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Piece checklist

Bricks 94 pieces

  • Brick 1 x 2 Black Part 3004 Element 300426 ×4
  • Brick 2 x 2 Blue Part 3003 Element 4103589 or 300373 ×4
  • Brick 2 x 4 Blue Part 3001 Element 300173 or 300123 ×4
  • Brick 1 x 12 Bright Light Orange Part 6112 Element 6482740 ×4
  • Brick 1 x 4 Bright Light Orange Part 3010 Element 6003004 or 4490697 ×4
  • Brick 2 x 2 Bright Light Orange Part 3003 Element 6295078 or 4645051 ×4
  • Brick 2 x 4 Bright Light Orange Part 3001 Element 6100027 or 4645053 ×4
  • Brick 2 x 6 Coral Part 2456 Element 6422922 ×4
  • Brick 1 x 8 Dark Turquoise Part 3008 Element 6289133 ×4
  • Brick 2 x 2 Dark Turquoise Part 3003 Element 6314091 or 4120399 ×4
  • Brick 2 x 4 Dark Turquoise Part 3001 Element 6249422 or 6235115 ×4
  • Brick 2 x 2 Green Part 3003 Element 300328 ×4
  • Brick 2 x 4 Green Part 3001 Element 4106356 or 300128 ×4
  • Brick 2 x 2 x 3 Light Bluish Gray Part 30145 Element 4211650 ×4
  • Brick 2 x 2 Medium Lavender Part 3003 Element 6545844 or 6070321 ×4
  • Brick 2 x 4 Medium Lavender Part 3001 Element 6013583 or 4655173 ×4
  • Brick 2 x 2 Red Part 3003 Element 4103590 or 300371 ×4
  • Brick 2 x 4 Red Part 3001 Element 300121 ×4
  • Brick 1 x 2 x 2 with Black Eye, White Iris Print White Part 3245cpr0010 Element 6610034 ×8
  • Brick 1 x 4 x 3 White Part 49311 Element 6552177 or 6256922 ×4
  • Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×4
  • Brick 2 x 2 White Part 3003 Element 6552095 or 6548256 ×4
  • Brick 2 x 8 White Part 3007 Element 6619309 or 6033776 ×2

Bricks Round and Cones 20 pieces

  • Cone 2 x 2 x 2, Open Stud Bright Light Orange Part 3942c Element 6559515 ×4
  • Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end Dark Turquoise Part 25214 Element 6584242 ×8
  • Cone 1 x 1 [Top Groove] Trans-Yellow Part 59900 Element 6514022 or 6337597 ×4
  • Brick Round 2 x 2 [Grill] White Part 92947 Element 6615536 or 4650644 ×4

Bricks Special 20 pieces

  • Brick Special 2 x 2 with Pin and Axle Hole Black Part 6232 Element 6365577 or 6070692 ×4
  • Brick Special 2 x 4 with 3 Axle Holes Black Part 39789 Element 6244917 ×4
  • Slide Straight 4 x 6 x 6 Bright Light Orange Part 27976 Element 6639098 or 6177209 ×2
  • Brick Special 2 x 4 with Pins Light Bluish Gray Part 6249 Element 6356158 or 4211676 ×4
  • Brick Special 2 x 4, with 2 x 2 Brick with Top Pin and 1 x 2 Side Plates Light Bluish Gray Part 30592 Element 6301425 or 6278504 ×2
  • Technic Brick 2 x 4 with 4 Pin Holes, 2 Pins White Part 112174 Element 6598035 ×4

Bricks Curved 16 pieces

  • Brick Curved 2 x 3 Bright Light Orange Part 6215 Element 6334834 ×4
  • Brick Curved 1 x 3 x 2 Coral Part 33243 Element 6482750 ×4
  • Brick Curved 1 x 2 x 1 No Studs Dark Turquoise Part 37352 Element 6584235 or 6345262 ×4
  • Brick Curved Inverted 2 x 4 Double White Part 5174 Element 6461062 ×4

Plates Special 12 pieces

  • Plate Special 2 x 2 with Rubber Foot Black Part 109373 Element 6492701 ×4
  • Plate Special 1 x 4 x 2/3 with 1 x 2 Bottom Cutout Coral Part 7769 Element 6598033 ×4
  • Plate Special 2 x 2 x 2/3 with Axle Hole and Grill on Sides (Haybale) Light Bluish Gray Part 71752 Element 6609654 ×4

Plates 10 pieces

  • Plate 2 x 6 Dark Turquoise Part 3795 Element 6259794 or 4121503 ×4
  • Plate 2 x 8 Light Bluish Gray Part 3034 Element 4211406 ×2
  • Plate 2 x 12 White Part 2445 Element 6552091 or 244501 ×4

Technic Bricks 10 pieces

  • Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Coral Part 32064a Element 6439447 ×4
  • Technic Brick 1 x 2 [1 Pin Hole] Dark Turquoise Part 3700 Element 6345402 or 4140338 ×4
  • Technic Brick 5 x 6 Right Angle Double White Part 7469 Element 6548852 ×2

Wheels and Tyres 10 pieces

  • Wheel with 4 Spokes with 2 Holes, 4 Inserts and Black Integral Tire Black Part 112175pat0001 Element 6598038 ×2
  • Wheel Rim 24 x 7 with Black Tyre White Part 74214 Element 6639402 ×8

Plants & Trees 8 pieces

  • Plant, Flower 2 x 2 - Round [Solid Stud] Coral Part 98262 Element 6639102 ×4
  • Plant, Flower 2 x 2 Leaves - Angular Dark Turquoise Part 4727 Element 6490210 ×4

Plates Round Curved and Dishes 8 pieces

  • Plate Round Corners 4 x 4 x 2/3 Circle with Reduced Knobs Bright Light Orange Part 66792 Element 6308882 ×2
  • Plate Round Corners 8 x 16 x 2/3 Circle with Reduced Knobs Bright Light Orange Part 5251 Element 6613584 ×2
  • Plate Round Corners 6 x 6 x 2/3 Circle with Reduced Knobs Light Bluish Gray Part 66789 Element 6299919 ×2
  • Dish 6 x 6 Inverted (Radar) with Solid Studs White Part 44375b Element 4514791 ×2

Technic Axles 8 pieces

  • Technic Axle 7 Light Bluish Gray Part 44294 Element 44294194 or 4211805 ×2
  • Technic Axle 4 Red Part 3705 Element 6129995 or 4265797 ×2
  • Technic Axle 3 Yellow Part 4519 Element 6130007 ×4

Technic Gears 5 pieces

  • Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] Black Part 18575 Element 6346535 or 6093977 ×2
  • Gear Track Straight 3 x 16 Bright Light Orange Part 7333 Element 6609686 ×2
  • Gear Box 4 x 4 x 2 for Gear Track Trans-Clear Part 7332 Element 6598042 ×1

Bars, Ladders and Fences 4 pieces

  • Antenna 1 x 4 with Flat Top Light Bluish Gray Part 3957b Element 4211473 ×4

Bricks Sloped 4 pieces

  • Brick Sloped 45° 2 x 2 Trans-Yellow Part 3039 Element 6526468 or 6383173 ×4

Flags, Banners and Signs 4 pieces

  • Flag 4 x 1 Wavy [First Wave Right] Bright Light Orange Part 4495b Element 6393668 or 4583751 ×4

Rock 4 pieces

  • Rock 1 x 1 Crystal 5 Point Trans-Red Part 30385 Element 6507863 or 6236961 ×4

Technic Pins 4 pieces

  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle Black Part 18651 Element 6089119 ×4

Tiles 4 pieces

  • Tile 2 x 6 White Part 69729 Element 6552183 or 6550182 ×4

Tiles Round and Curved 4 pieces

  • Tile Round 2 x 4 Coral Part 66857 Element 6611550 ×4

Tiles Special 4 pieces

  • Tile Special 2 x 3 Pentagonal Bright Light Orange Part 22385 Element 6340721 ×4

Windows and Doors 4 pieces

  • Door 1 x 4 x 6 with 4 Panes and Stud Handle Coral Part 60623 Element 6526039 ×2
  • Door Frame 2 x 4 x 6 White Part 60599 Element 4528140 or 4520843 ×2

Electronics 3 pieces

  • Motor 6 x 6 x 3, Science White Part 118084 Element 6666303 or 6610673 ×1
  • Sensor, Colour, Science White Part 118092 Element 6666299 or 6611005 ×1
  • USB Cable White Part 114253 Element 6554054 ×1

Tubes and Hoses 2 pieces

  • Axle Hose, Soft 11L Black Part 32199 Element 4234438 or 4121646 ×2

Gear Parts 1 piece

  • Activity Card ? for Science Kits [No Color/Any Color] Part 119190 Element 6633001 ×1

Tools 1 piece

  • Brick and Axle Separator v2.0 Dark Turquoise Part 96874 Element 6254100 ×1

Minifigures 4 figures

  • Monochrome Bright Green Minifigure, checked as a whole figure ×1
  • Monochrome Red, 28621 Head Minifigure, checked as a whole figure ×1
  • Monochrome Blue Minifigure, checked as a whole figure ×1
  • Monochrome Bright Light Orange, 28621 Head Minifigure, checked as a whole figure ×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.

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