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.

Communication Kit for RTS

Checking

2000401 Communication Kit for RTS

1,000 pieces in 18 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

Duplo, Quatro and Primo 440 pieces

  • Duplo Plate 4 x 8 Green Part 4672 Element 4279291 or 467228 ×3
  • Duplo Baseplate 24 x 24 Red Part 4268 Element 6194396 or 4219838 ×2
  • Duplo Tile 2 x 2 White Part 6309 Element 4219247 or 630901 ×432
  • Duplo Plate 4 x 8 Yellow Part 4672 Element 6465940 or 6278979 ×3

Tiles Special 250 pieces

  • Tile Special 2 x 3 with 2 Clips [Angled Clips] Light Gray Part 30350a Element 4142079 ×25
  • Tile Special 2 x 3 with 2 Clips [Angled Clips] Red Part 30350a Element 4143252 ×25
  • Tile Special 2 x 2 with Bar and Stud White Part 30256 Element 4117032 ×200

Flags, Banners and Signs 200 pieces

  • Flag 4 x 1 Wavy [First Wave Right] Blue Part 4495b Element 6268955 or 6215573 ×25
  • Flag 4 x 1 Wavy [First Wave Right] Green Part 4495b Element 6268947 or 449528 ×25
  • Flag 4 x 1 Wavy [First Wave Right] Red Part 4495b Element 6268946 or 449521 ×25
  • Flag 4 x 1 Wavy [First Wave Right] Yellow Part 4495b Element 6268959 or 6250272 ×25
  • Flag 6 x 4 with O-Clips Yellow Part 2525 Element 4521393 or 4125320 ×100

Bars, Ladders and Fences 100 pieces

  • Antenna 1 x 4 with Flat Top Black Part 3957b Element 395726 ×25
  • Antenna 1 x 4 with Flat Top Red Part 3957b Element 6263684 ×25
  • Antenna 1 x 4 with Flat Top White Part 3957b Element 6550147 or 395701 ×25
  • Antenna 1 x 4 with Flat Top Yellow Part 3957b Element 6397876 ×25

Plates Special 10 pieces

  • Plate Special 6 x 12, Studs on 3 Edges Medium Orange Part 6178 Element 4143565 ×5
  • Plate Special 6 x 16, Studs on 3 Edges Pink Part 6205 Element 4119592 ×5

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.