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.

Intelli-Train Tunnel

Checking

3334 Intelli-Train Tunnel

10 pieces in 6 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.

Show

Piece checklist

Dark Gray 4 pieces

  • Duplo Train Track 4 x 8 Curved [Short] Dark Gray Part 6378 Element 637827 ×2
  • Duplo Train Track 4 x 8 Straight Dark Gray Part 6377 Element 637727 ×2

Trans-Purple 3 pieces

  • Duplo Brick 1 x 2 x 2 with Tunnel Print Trans-Purple Part 4066pr9999 ×2
  • Duplo Train Intelligent Train Smart Tile with Tunnel Print Trans-Purple Part 42389 Element 4165509 ×1

Black 2 pieces

  • Duplo Support 2 x 3 x 3 with 2 Top Studs Black Part 41969 Element 4162956 ×2

Green 1 piece

  • Duplo Mountain / Tunnel Green Part 31365 Element 4288202 or 4197266 ×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.