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.

Crazy Action Contraptions: A LEGO Inventions Book

Checking

1570541574 Crazy Action Contraptions: A LEGO Inventions Book

64 pieces in 25 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

Light Gray 32 pieces

  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×4
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 ×2
  • Technic Beam 1 x 4 Thin with Stud Connector Light Gray Part 2825 Element 4107133 or 282502 ×1
  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 ×7
  • Technic Gear 24 Tooth [Old Style - Three axle holes] Light Gray Part 3648a ×2
  • Technic Gear 40 Tooth Light Gray Part 3649 Element 364902 ×2
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 ×1
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×7
  • Technic Plate 2 x 8 [7 Holes] Light Gray Part 3738 Element 373802 ×2
  • Technic Steering Pulley Large Light Gray Part 3736 Element 373602 ×2
  • Technic Wedge Belt Wheel [aka Pulley] Light Gray Part 4185 Element 4100502 or 418502 ×2

Black 16 pieces

  • Rubber Band 15mm [Square Cross Section] Black Part 23229 Element 4141604 ×2
  • Rubber Band Large [Square Cross Section] Black Part 70158 ×3
  • Technic Axle 10 Black Part 3737 Element 373726 ×2
  • Technic Axle 12 Black Part 3708 Element 370826 ×1
  • Technic Axle 6 Black Part 3706 Element 370626 ×2
  • Technic Axle 8 Black Part 3707 Element 370726 ×2
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×4

Blue 9 pieces

  • Technic Brick 1 x 12 [11 Pin Holes] Blue Part 3895 Element 389523 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Blue Part 3700 Element 370023 ×2
  • Technic Brick 1 x 6 [5 Pin Holes] Blue Part 3894 Element 389423 ×2
  • Technic Brick 1 x 8 [7 Pin Holes] Blue Part 3702 Element 370223 ×3

Red 7 pieces

  • Technic Brick 1 x 10 [9 Pin Holes] Red Part 2730 Element 273021 ×2
  • Technic Brick 1 x 4 [3 Pin Holes] Red Part 3701 Element 370121 ×2
  • Technic Brick 1 x 8 [7 Pin Holes] Red Part 3702 Element 370221 ×3

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.