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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.

Intelligent Train Starter Set (Explore)

Checking

3335 Intelligent Train Starter Set (Explore)

29 pieces in 17 part and color combinations.

LEGO counts 25 pieces. This inventory comes from a separate parts catalog and lists 29; 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

Dark Gray 14 pieces

  • Duplo Train Track 4 x 8 Curved [Short] Dark Gray Part 6378 Element 637827 ×12
  • Duplo Train Track 4 x 8 Straight Dark Gray Part 6377 Element 637727 ×2

Red 3 pieces

  • Duplo Brick 2 x 2 Red Part 3437 Element 4583321 or 343721 ×1
  • Duplo Figure, Early, with Flat Cap Trans-Brown, Black Legs, Bandana, Pockets Print (Intelli-Train Driver) Red Part 44349pr0002 ×1
  • Duplo Train Cargo Bin Red Part 31303 Element 4170041 ×1

Blue 2 pieces

  • Duplo Brick 2 x 2 Blue Part 3437 Element 343723 ×1
  • Duplo Figure, Early, Hard Hat Orange, Blue Legs, Shirt with Pockets / 'Cargo' on Back Print Blue Part 74506pr0001 Element 4169669 ×1

Pearl Light Gray 2 pieces

  • Duplo Train Compartment/Container Frame Pearl Light Gray Part 31301 Element 4168690 ×1
  • Duplo Wheelbarrow with Thin Black Wheels Pearl Light Gray Part 2292c02 Element 4157664 ×1

Yellow 2 pieces

  • Duplo Figure, Early, with Flat Cap Trans-Brown, Black Legs, Bandana, Pockets Print (Intelli-Train Driver) Yellow Part 44349pr0001 Element 4165501 ×1
  • Duplo Train Intelligent Train Engine Base Yellow Part 6172 ×1

Black 1 piece

  • Duplo Train Base 4 x 8 with Pearl Light Gray Train Wheels and Moveable Hook Black Part 31507c01 ×1

Green 1 piece

  • Duplo Brick 2 x 2 Green Part 3437 Element 6528078 or 4583552 ×1

Trans-Brown 1 piece

  • Duplo Train, Intelligent Train Engine Canopy Trans-Brown Part 42359 ×1

Trans-Dark Pink 1 piece

  • Duplo Train Intelligent Train Smart Tile with Horn Print Trans-Dark Pink Part 42388 Element 4165527 or 4165507 ×1

Trans-Light Blue 1 piece

  • Duplo Train Intelligent Train Smart Tile with Reverse Arrow Print Trans-Light Blue Part 42387 Element 4165526 or 4165506 ×1

Trans-Red 1 piece

  • Duplo Train Intelligent Train Smart Brick with Stop Sign Print Trans-Red Part 42386 Element 4165515 or 4165505 ×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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