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LEGO Missing Piece Checker

Enter a set number, mark each piece found or missing, and leave with a list of what is missing, the element IDs LEGO asks for and links to buy the parts. It is free and needs no account. Rule out the usual hiding places first.

Universal Building Set

Checking

8020 Universal Building Set

119 pieces in 37 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

Plates 36 pieces

  • Plate 1 x 2 Light Gray Part 3023 Element 302302 ×2
  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×3
  • Plate 1 x 1 Trans-Yellow Part 3024 Element 6513966 or 6252045 ×2
  • Plate 1 x 2 Yellow Part 3023 Element 302324 ×16
  • Plate 1 x 4 Yellow Part 3710 Element 371024 ×4
  • Plate 1 x 6 Yellow Part 3666 Element 366624 ×4
  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×1
  • Plate 2 x 6 Yellow Part 3795 Element 379524 ×4

Technic Bricks 20 pieces

  • Technic Brick 1 x 12 [11 Pin Holes] Black Part 3895 Element 389526 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Yellow Part 3700 Element 370024 ×8
  • Technic Brick 1 x 6 [5 Pin Holes] Yellow Part 3894 Element 389424 ×2
  • Technic Brick 1 x 8 [7 Pin Holes] Yellow Part 3702 Element 370224 ×8

Technic Pins 15 pieces

  • Technic Pin with Friction Ridges Lengthwise, without Center Slots Black Part 4459 ×4
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 1 spare in the box ×7
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 2 spares in the box ×4

Wheels and Tyres 10 pieces

  • Tyre Offset Tread 24 x 8 Black Part 3483 Element 4501048 or 348326 ×5
  • Wheel with Split Axle Hole Light Gray Part 3482 Element 348202 ×5

Technic Gears 6 pieces

  • Technic Gear 24 Tooth Crown with Flat Teeth Light Gray Part 3650a ×1
  • Technic Gear 24 Tooth [Old Style - Three Axle Holes] Light Gray Part 3648a ×1
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 ×3
  • Technic Gear Rack 1 x 4 Light Gray Part 3743 Element 374302 ×1

Technic Axles 5 pieces

  • Technic Axle 4 Black Part 3705 Element 370526 ×2
  • Technic Axle 6 Black Part 3706 Element 370626 ×2
  • Technic Axle 8 Black Part 3707 Element 370726 ×1

Bricks 4 pieces

  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×4

Bricks Sloped 4 pieces

  • Brick Sloped 45° 2 x 1 with Bottom Pin Yellow Part 3040b Element 4121965 or 304024 ×2
  • Brick Sloped Inverted 45° 2 x 1 Yellow Part 3665 Element 366524 ×2

Technic Bushes 4 pieces

  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 1 spare in the box ×4

Technic Special 3 pieces

  • Technic Plate 1 x 6 with Toothed Ends Light Gray Part 4262 Element 4240413 or 4109661 ×3

Bricks Special 2 pieces

  • Brick Special 1 x 1 with Headlight Yellow Part 4070 Element 407024 ×2

Plates Round Curved and Dishes 2 pieces

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

Plates Special 2 pieces

  • Technic Plate 2 x 4 [3 Holes] Yellow Part 3709 Element 370924 ×2

Technic Steering, Suspension and Engine 2 pieces

  • Technic Steering Arm Light Gray Part 4261 Element 4225506 or 4189316 ×2

Windows and Doors 2 pieces

  • Door 1 x 3 x 1 Left Yellow Part 3822 Element 6587460 or 4190511 ×1
  • Door 1 x 3 x 1 Right Yellow Part 3821 Element 6587459 or 4537985 ×1

Tiles 1 piece

  • Tile 2 x 2 with Groove Light Gray Part 3068b Element 306802 ×1

Windscreens and Fuselage 1 piece

  • Windscreen 2 x 6 x 2, Wide Top Trans-Clear Part 4176 Element 4502193 or 4179426 ×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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