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.

Basic Set

Checking

1945 Basic Set

18 pieces in 14 part and color combinations.

LEGO counts 16 pieces. This inventory comes from a separate parts catalog and lists 18; 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.

Show

Piece checklist

Duplo, Quatro and Primo 17 pieces

  • Duplo Brick 2 x 2 Blue Part 3437 Element 343723 ×2
  • Duplo Brick 2 x 4 Blue Part 3011 Element 4290075 or 301123 ×1
  • Duplo Brick 2 x 2 Green Part 3437 Element 6528078 or 4583552 ×2
  • Duplo Brick 2 x 4 Green Part 3011 Element 4290071 or 301128 ×1
  • Duplo Brick 2 x 2 Red Part 3437 Element 4583321 or 343721 ×2
  • Duplo Brick 2 x 3 x 2 with Curve Red Part 2301 Element 230121 ×2
  • Duplo Brick 2 x 4 Red Part 3011 Element 4583326 or 4290074 ×1
  • Duplo Door / Window with Porthole Red Part 4248 Element 4143624 or 424821 ×1
  • Duplo Brick 1 x 2 x 2 with Brown Teddy Bear Print Yellow Part 4066pr0149 Element 4142106 or 82443 ×1
  • Duplo Brick 1 x 2 x 2 with Stacking Rings Toy Print Yellow Part 4066pr0037 ×1
  • Duplo Brick 2 x 2 Yellow Part 3437 Element 4583546 or 343724 ×1
  • Duplo Brick 2 x 4 Yellow Part 3011 Element 4290060 or 301124 ×1
  • Duplo Door / Window Frame Flat Front Surface Yellow Part 4253 ×1

Non-Buildable Figures (Duplo, Fabuland, etc) 1 piece

  • Duplo 2 x 2 x 2 Figure Brick, Rounded Bangs, Red Hair, Red and White Apron Print Red Part 2327c02pr0006 Element 75423 ×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.