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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.

Track Marshal

Checking

8121 Track Marshal

48 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

Black 21 pieces

  • Bracket 1 x 2 - 1 x 4 [Square Corners] Black Part 2436 Element 4282746 or 243626 ×2
  • Brick Curved 2 x 4 x 2/3 No Studs [No Bottom Tubes] Black Part 61068 Element 4516431 ×2
  • Plate 2 x 4 Black Part 3020 Element 302026 ×3
  • Plate 4 x 4 Black Part 3031 Element 4243819 or 303126 ×1
  • Plate Round 1 x 1 with Solid Stud Black Part 6141 Element 614126 1 spare in the box ×2
  • Plate Special 2 x 2 with Wheels Holder Wide Black Part 6157 Element 615726 ×2
  • Tile Special 1 x 2 Grille with Bottom Groove Black Part 2412b Element 241226 ×1
  • Tyre 14 x 6 Solid Smooth Black Part 50951 Element 4246901 ×4
  • Wheel 11 x 6 mm with Five Spokes and Silver Print Black Part 50944pr0001 Element 6022424 or 4248538 ×4

White 20 pieces

  • Bracket 1 x 2 - 1 x 4 [Square Corners] White Part 2436 Element 4282737 or 4159314 ×1
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×2
  • Brick Special 1 x 1 with Headlight White Part 4070 Element 6548267 or 407001 ×2
  • Mudguard 2 x 4 with Molded Headlights White Part 44674 Element 6485272 or 4297330 ×1
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×1
  • Plate 1 x 4 White Part 3710 Element 6552108 or 6548266 ×5
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×1
  • Plate 2 x 6 White Part 3795 Element 6550146 or 379501 ×1
  • Plate Special 1 x 2 with Door Rail White Part 32028 Element 6550168 or 4249563 ×1
  • Tile 1 x 2 with Groove White Part 3069b Element 6548264 or 306901 ×2
  • Tile 1 x 4 with Groove White Part 2431 Element 6548255 or 243101 ×1
  • Tile 2 x 2 with Groove White Part 3068b Element 6548263 or 306801 ×1
  • Wheel Arch, Mudguard 2 x 4 Studded White Part 3788 Element 4289272 ×1

Trans-Orange 4 pieces

  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Orange Part 54200 Element 6245265 or 4244369 1 spare in the box ×2
  • Tile 1 x 2 with Groove Trans-Orange Part 3069b Element 6514225 or 6251306 ×2

Trans-Red 2 pieces

  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Red Part 54200 Element 6245252 or 4244363 1 spare in the box ×2

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 8121-1 [No Color/Any Color] Part 64971 Element 4540218 ×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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