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.

Speed Computer

Checking

5206 Speed Computer

19 pieces in 12 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

Wheels and Tyres 6 pieces

  • Technic Wedge Belt Wheel Tire Black Part 2815 Element 6028041 or 281526 ×3
  • Technic Wedge Belt Wheel [aka Pulley] Light Gray Part 4185 Element 4100502 or 418502 ×3

Technic Axles 3 pieces

  • Technic Axle 2 Notched Black Part 32062 Element 4109810 or 3206226 ×1
  • Technic Axle 6 Black Part 3706 Element 370626 ×1
  • Technic Axle 8 Black Part 3707 Element 370726 ×1

Technic Connectors 3 pieces

  • Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle) Light Gray Part 6553 Element 655302 1 spare in the box ×1
  • Technic Axle and Pin Connector Angled #1 Light Gray Part 32013 Element 4106376 ×2

Electronics 2 pieces

  • Hub, Speed Computer Yellow Part 23144c01 Element 4142150 ×1
  • Battery 3V Lithium Coin Cell [No Color/Any Color] Part upn0144 ×1

Plates 2 pieces

  • Plate 1 x 2 Light Gray Part 3023 Element 302302 ×2

Technic Bushes 2 pieces

  • Technic Bush 1/2 Smooth with Axle Hole Reduced Light Gray Part 32123a 2 spares in the box ×2

Technic Bricks 1 piece

  • Technic Brick 1 x 4 [3 Pin Holes] Black Part 3701 Element 370126 ×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.