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.

Young Dimetrodon (The Two-Toothed)

Checking

6725 Young Dimetrodon (The Two-Toothed)

20 pieces in 13 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

Bricks Sloped 8 pieces

  • Brick Sloped 45° 2 x 2 Dark Gray Part 3039 Element 4109984 ×2
  • Brick Sloped Inverted 45° 2 x 1 Dark Gray Part 3665 Element 4114060 or 366527 ×2
  • Brick Sloped 45° 2 x 1 with Bottom Pin Light Gray Part 3040b Element 4121933 or 304002 ×2
  • Brick Sloped 33° 3 x 2 Sand Blue Part 3298 Element 4225649 or 4143024 ×2

Animal / Creature Body Parts 6 pieces

  • Animal Body Part, Dinosaur, Back Sail 8 x 2 x 5 Dark Gray Part 40385 Element 4153771 ×1
  • Animal / Creature Body Part, Dinosaur / Dragon Arm, Left Sand Blue Part 6128 Element 4152994 ×1
  • Animal / Creature Body Part, Dinosaur / Dragon Arm, Right Sand Blue Part 6127 Element 4152992 ×1
  • Animal / Creature Body Part, Neck / Tail, S Curve with Pin Sand Blue Part 40396 Element 4153769 ×1
  • Animal Body Part / Plant, Tail / Claw / Horn / Branch / Tentacle, End Section Sand Blue Part 40379 Element 4174997 or 4152978 ×1
  • Animal Body Part, Dinosaur, Head, Small Sand Blue Part 40384 Element 4175028 or 4152981 ×1

Technic Bricks 4 pieces

  • Technic Brick 1 x 2 [1 Pin Hole] Dark Gray Part 3700 Element 4114529 or 370027 ×4

Plates 1 piece

  • Plate 2 x 6 Light Gray Part 3795 Element 379502 ×1

Technic Pins 1 piece

  • Technic Pin 1/2 without Friction Ridges Light Gray Part 4274 Element 427402 ×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.