BlockTalk Find Your Set

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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.

Diesel Locomotive

Checking

723 Diesel Locomotive

97 pieces in 26 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

Red 46 pieces

  • Brick 1 x 1 Red Part 3005 Element 300521 ×12
  • Brick 1 x 4 Red Part 3010 Element 301021 ×4
  • Brick 1 x 6 Red Part 3009 Element 300921 ×2
  • Brick 1 x 8 with Gold '723' Print Red Part 3008pr0006 ×2
  • Brick 2 x 2 without Inside Ridges Red Part 3003a ×1
  • Brick 2 x 3 without Cross Supports Red Part 3002a ×4
  • Brick 2 x 4 without Cross Supports Red Part 3001a ×1
  • Brick Sloped 45° 2 x 2 Red Part 3039 Element 303921 ×1
  • Plate 1 x 2 Red Part 3023 Element 302321 ×10
  • Plate 2 x 2 Red Part 3022 Element 4613974 or 302221 ×1
  • Plate 2 x 4 Red Part 3020 Element 302021 ×2
  • Plate Special 2 x 4 with Train Coupler Open with Magnet Short Cylinder Blue Red Part 737ac02 ×1
  • Plate Special 2 x 4 with Train Coupler Open with Magnet Short Cylinder Red Red Part 737ac01 ×1
  • Train Wheel Spoked for Motor Red Part upn0383a ×4

Black 21 pieces

  • Brick 1 x 2 Black Part 3004 Element 300426 ×4
  • Brick 2 x 3 without Cross Supports Black Part 3002a ×4
  • Brick 2 x 4, 12V with Power Pickups for Train Motor and Solid Pins Black Part 433c01 ×2
  • Motor, Train, 12V 12 x 4 x 3 1/3 Type I with Two Side Holes Black Part upn0274c02 ×1
  • Plate 2 x 8 Black Part 3034 Element 303426 ×5
  • Plate Special 6 x 16 with Motor Opening Wide Black Part 3058b Element 4159871 ×1
  • Tyre for Train Wheel for Electric Train Motor 12V Black Part 458 ×4

Yellow 16 pieces

  • Plate 1 x 2 Yellow Part 3023 Element 302324 ×16

Trans-Clear 12 pieces

  • Brick 1 x 1 Trans-Clear Part 3005 Element 6514207 or 6220959 ×8
  • Brick 1 x 2 Trans-Clear Part 3004 Element 4256587 or 300410 ×4

Blue 1 piece

  • Wire with 2-Prong Connector with Cap, and Train Track Contact Base, 97cm [Complete Assembly] Blue Part 2913c02 ×1

Metal 1 piece

  • Screwdriver with Old LEGO Logo [Metal] Metal Part 299 ×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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