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.

Gearbox Pack

Checking

673F Gearbox Pack

6 pieces in 4 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

Technic Connectors 2 pieces

  • Technic Spike Connector Pin Double 3L Light Bluish Gray Part 45575 Element 4224139 ×2

Wheels and Tyres 2 pieces

  • Technic Bush RC Car Wheel Flexible Light Bluish Gray Part 45799 Element 4224140 ×2

Electronics 1 piece

  • Motor, RC with Flexible Superaxles Black Part 45805c01 Element 4224151 ×1

String, Bands and Reels 1 piece

  • Technic Rubber Belt Medium [24mm ID] [Round Cross Section] Green Part 85544 ×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.