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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.

Window Exploration Bag

Checking

2000409 Window Exploration Bag

4,900 pieces in 31 part and color combinations, plus 100 minifigures.

LEGO counts 4,900 pieces. This inventory comes from a separate parts catalog and lists 5,200, including the 300 parts inside the minifigures; 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.

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Piece checklist

Dark Bluish Gray 900 pieces

  • Brick 1 x 2 Dark Bluish Gray Part 3004 Element 4211088 ×200
  • Brick Sloped 33° 3 x 1 Dark Bluish Gray Part 4286 Element 4211045 ×200
  • Brick Sloped Inverted 34° 3 x 1 with Internal Stopper Dark Bluish Gray Part 4287b ×200
  • Brick Special 1 x 2 with Pin Dark Bluish Gray Part 2458 Element 4211087 ×100
  • Plate Special 1 x 2 with Ladder Dark Bluish Gray Part 4175 Element 6285244 or 6179567 ×100
  • Tile Special 2 x 2 with Top Pin Dark Bluish Gray Part 2460 Element 4211129 ×100

Green 800 pieces

  • Brick 1 x 2 Green Part 3004 Element 4107736 or 300428 ×200
  • Brick 1 x 4 Green Part 3010 Element 4112838 or 301028 ×200
  • Brick 2 x 2 Green Part 3003 Element 300328 ×100
  • Brick 2 x 4 Green Part 3001 Element 4106356 or 300128 ×100
  • Flag 4 x 1 Wavy [First Wave Right] Green Part 4495b Element 6268947 or 449528 ×200

Yellow 600 pieces

  • Brick 1 x 1 with Simple Black Eye with White Pupil Print Yellow Part 3005pr0003 Element 4569076 ×300
  • Brick Curved 2 x 3 Yellow Part 6215 Element 621524 ×100
  • Plate 2 x 6 Yellow Part 3795 Element 379524 ×200

Black 400 pieces

  • Antenna 1 x 4 with Flat Top Black Part 3957b Element 395726 ×200
  • Plate 4 x 6 Black Part 3032 Element 303226 ×100
  • Propeller 4 Blade 5 Diameter with Rounded Ends, Open Hub Black Part 2479 Element 247926 ×100

Orange 400 pieces

  • Brick Sloped 45° 2 x 1 with Bottom Pin Orange Part 3040b Element 4121967 or 4118901 ×200
  • Plate 2 x 3 Orange Part 3021 Element 4125278 ×100
  • Plate 2 x 4 Orange Part 3020 Element 4158355 or 4122468 ×100

Blue 200 pieces

  • Brick 1 x 4 Blue Part 3010 Element 301023 ×200

Dark Pink 200 pieces

  • Brick 1 x 4 Dark Pink Part 3010 Element 4621542 or 4245308 ×200

Light Bluish Gray 200 pieces

  • Brick Arch 1 x 4 Light Bluish Gray Part 3659 Element 4211435 ×200

Lime 200 pieces

  • Brick 1 x 2 Lime Part 3004 Element 4613965 or 4164022 ×200

Red 200 pieces

  • Brick 1 x 4 Red Part 3010 Element 301021 ×200

Tan 200 pieces

  • Plate 1 x 10 Tan Part 4477 Element 4143409 or 447705 ×200

Trans-Red 200 pieces

  • Brick 1 x 2 without Bottom Tube Trans-Red Part 3065 Element 6514263 or 6244905 ×200

Bright Green 100 pieces

  • Plant, Flower 2 x 2 Leaves - Angular Bright Green Part 4727 Element 4143562 ×100

Trans-Clear 100 pieces

  • Brick Sloped 45° 2 x 2 Trans-Clear Part 3039 Element 6514100 or 6244886 ×100

Trans-Dark Pink 100 pieces

  • Plant, Flower 2 x 2 - Round [Open Stud] Trans-Dark Pink Part 4728 Element 4142898 ×100

Trans-Yellow 100 pieces

  • Brick Round 2 x 2 with Axle Hole Trans-Yellow Part 3941 Element 6514285 or 6273155 ×100

Minifigures 100 figures

  • Woman, Blue Torso with White Arms, White Legs, Red Lips Minifigure, checked as a whole figure ×100

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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