BlockTalk Find Your Set

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.

Basic Building Set

Checking

4122 Basic Building Set

201 pieces in 54 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

Bricks 199 pieces

  • Brick 1 x 2 Black Part 3004 Element 300426 ×2
  • Brick 1 x 4 Black Part 3010 Element 301026 ×2
  • Brick 2 x 2 Black Part 3003 Element 4103587 or 300326 ×6
  • Brick 2 x 3 Black Part 3002 Element 300226 ×2
  • Brick 2 x 4 Black Part 3001 Element 300126 ×4
  • Brick 1 x 2 Blue Part 3004 Element 4613959 or 300423 ×4
  • Brick 1 x 4 Blue Part 3010 Element 301023 ×4
  • Brick 2 x 2 Blue Part 3003 Element 4103589 or 300373 ×8
  • Brick 2 x 3 Blue Part 3002 Element 300223 ×4
  • Brick 2 x 4 Blue Part 3001 Element 300173 or 300123 ×6
  • Brick 1 x 1 with Simple Eye Black and White Print Dark Gray Part 3005pr9996 Element 4143430 ×2
  • Brick 1 x 2 Dark Gray Part 3004 Element 4113909 or 300427 ×2
  • Brick 1 x 4 Dark Gray Part 3010 Element 4114308 or 301027 ×2
  • Brick 2 x 2 Dark Gray Part 3003 Element 4110008 or 300327 ×4
  • Brick 2 x 3 Dark Gray Part 3002 Element 4114320 or 300227 ×2
  • Brick 2 x 4 Dark Gray Part 3001 Element 4113855 or 300127 ×4
  • Brick 1 x 1 with Simple Eye Black and White Print Green Part 3005pr9996 Element 4107722 ×2
  • Brick 1 x 2 Green Part 3004 Element 4107736 or 300428 ×4
  • Brick 1 x 4 Green Part 3010 Element 4112838 or 301028 ×2
  • Brick 2 x 2 Green Part 3003 Element 300328 ×6
  • Brick 2 x 3 Green Part 3002 Element 4109674 or 300228 ×2
  • Brick 2 x 4 Green Part 3001 Element 4106356 or 300128 ×4
  • Brick 2 x 4 with Wavy Mouth and Eyes Print Green Part 3001pr0009 Element 4144010 ×1
  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×6
  • Brick 1 x 4 Red Part 3010 Element 301021 ×6
  • Brick 1 x 6 Red Part 3009 Element 300921 ×4
  • Brick 1 x 8 Red Part 3008 Element 300821 ×2
  • Brick 2 x 2 Red Part 3003 Element 4103590 or 300371 ×8
  • Brick 2 x 2 with Eye with White Print on Two Sides, Offset Red Part 3003pr0053 Element 81912 ×2
  • Brick 2 x 3 Red Part 3002 Element 300271 or 300221 ×4
  • Brick 2 x 4 Red Part 3001 Element 300121 ×6
  • Brick 2 x 6 Red Part 2456 Element 4181138 or 245621 ×2
  • Brick 2 x 8 Red Part 3007 Element 6036408 or 300721 ×2
  • Brick 2 x 2 without Inside Ridges Trans-Dark Blue Part 6223 Element 6514091 or 6238043 ×2
  • Brick 1 x 2 without Bottom Tube Trans-Green Part 3065 Element 6514266 or 6244908 ×2
  • Brick 2 x 2 without Inside Ridges Trans-Green Part 6223 Element 6514090 or 6219774 ×2
  • Brick 1 x 2 without Bottom Tube Trans-Light Blue Part 3065 Element 6514268 or 6244910 ×2
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 ×6
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×6
  • Brick 2 x 2 White Part 3003 Element 6552095 or 6548256 ×8
  • Brick 2 x 2 with Eye with White Print on Two Sides, Offset White Part 3003pr0053 Element 81508 ×2
  • Brick 2 x 3 White Part 3002 Element 6550133 or 300251 ×4
  • Brick 2 x 4 White Part 3001 Element 6552094 or 300101 ×6
  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×6
  • Brick 1 x 2 with Black and White Squinting Eyes and Hair Print Yellow Part 3004pr9980 Element 4143432 ×1
  • Brick 1 x 4 Yellow Part 3010 Element 301024 ×4
  • Brick 1 x 6 Yellow Part 3009 Element 300924 ×4
  • Brick 1 x 8 Yellow Part 3008 Element 300824 ×2
  • Brick 2 x 2 Yellow Part 3003 Element 4103588 or 300374 ×8
  • Brick 2 x 3 Yellow Part 3002 Element 300224 ×4
  • Brick 2 x 4 Yellow Part 3001 Element 300124 ×6
  • Brick 2 x 4 with Wavy Mouth and Eyes Print Yellow Part 3001pr0009 Element 4110006 ×1
  • Brick 2 x 6 Yellow Part 2456 Element 4181143 or 245624 ×2

Tubes and Hoses 2 pieces

  • Flexible Hose 8.5L with Tabbed Ends (Ends same color as Tube) Black Part 73590c02a Element 4540890 or 621130 ×2

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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