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.

Racer

Checking

3521 Racer

34 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.

Show

Piece checklist

Znap 21 pieces

  • Znap Beam 3, 1 Hole Black Part 32210 Element 4128660 or 4120411 ×2
  • Znap Beam 7, 3 Holes Black Part 32203 Element 4128652 or 4120186 ×4
  • Znap Connector 1 x 3 - 2 way A Light Gray Part 32212 Element 4120191 ×4
  • Znap Connector 3 x 3 - 4 way B (Beam) Purple Part 32211 Element 4120200 ×6
  • Znap Beam 1/2 Circle Radius 2L Red Part 32205 Element 4128657 or 4120415 ×1
  • Znap Beam 4, 2 Holes, 2 Bends Red Part 32242 Element 4125486 ×2
  • Znap Beam 8, 4 Holes, 3 Bends, Curved Red Part 32246 Element 4125487 ×2

Wheels and Tyres 6 pieces

  • Tyre 20 x 30 Balloon Medium 49.6 x 20 Black Part 6581 Element 658126 ×2
  • Wheel 32mm Znap Propeller Black Part 32219 Element 4120493 ×2
  • Wheel 20 x 30 Balloon Medium White Part 6582 Element 4193785 or 658201 ×2

Technic Bushes 4 pieces

  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 ×4

Technic Axles 3 pieces

  • Technic Axle 12 White Part 3708 Element 4655283 or 4222794 ×1
  • Technic Axle 5.5 with Stop [Flat Short End] White Part 32209 Element 4120471 ×2

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.