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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.

Locomotive Blue Bricks

Checking

3743 Locomotive Blue Bricks

106 pieces in 33 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

Blue 60 pieces

  • Brick 1 x 10 Blue Part 6111 Element 6057905 or 4497172 ×2
  • Brick 1 x 2 Blue Part 3004 Element 4613959 or 300423 ×21
  • Brick 1 x 6 Blue Part 3009 Element 300923 ×1
  • Brick 2 x 6 Blue Part 2456 Element 4181139 or 245623 ×1
  • Brick Sloped 45° 2 x 1 with Bottom Pin Blue Part 3040b Element 4121936 or 304023 ×6
  • Brick Sloped 45° 2 x 4 Blue Part 3037 Element 4107437 or 303723 ×6
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Blue Part 3660 Element 366023 ×4
  • Brick Special 1 x 1 with Handle Blue Part 2921 Element 6469321 or 4587848 ×12
  • Plate 1 x 2 Blue Part 3023 Element 302323 ×2
  • Plate 1 x 3 Blue Part 3623 Element 362323 ×2
  • Plate 2 x 4 Blue Part 3020 Element 4240375 or 302023 ×1
  • Tile Special 1 x 2 with Handle Blue Part 2432 Element 243223 ×2

Black 27 pieces

  • Brick 1 x 2 Black Part 3004 Element 300426 ×4
  • Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×1
  • Brick Sloped 33° 3 x 4 Black Part 3297 Element 6435854 or 329726 ×4
  • Dish 4 x 4 Inverted [Radar] Black Part 3960 Element 396026 ×1
  • Equipment Weapon, Loudhailer / Speaker / Blaster / Space Gun Black Part 4349 Element 434926 ×1
  • Panel 1 x 2 x 3 [Hollow Studs] Black Part 2362b Element 236226 ×2
  • Panel 1 x 4 x 3 [Hollow Studs] Black Part 4215b Element 4105207 ×2
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×1
  • Plate Special 1 x 1 with Clip Horizontal [Thick U Clip] Black Part 6019 Element 601976 or 601926 ×2
  • Plate Special 1 x 2 Side Handle [Free Ends] Black Part 2540 Element 4140588 or 254026 ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Black Part 3794a ×1
  • Plate Special 1 x 2 with Ladder Black Part 4175 Element 6285241 or 6179557 ×2
  • Plate Special 1 x 8 with Door Rail Black Part 4510 Element 4286009 or 451026 ×2
  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×1
  • Tile Special 1 x 2 Grille with Bottom Groove Black Part 2412b Element 241226 ×1

Dark Gray 11 pieces

  • Brick Round 1 x 1 Open Stud Dark Gray Part 3062b Element 4113912 or 306227 ×2
  • Plate Round 1 x 1 with Solid Stud Dark Gray Part 6141 Element 4124087 or 614127 ×8
  • Technic Axle 3 with Stud Dark Gray Part 6587 Element 4113884 or 658727 ×1

Trans-Neon Green 4 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Neon Green Part 6141 Element 6240223 or 3005749 ×4

Trans-Red 3 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 ×3

White 1 piece

  • Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin White Part 32064a Element 6548286 or 6178921 ×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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