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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.

Special Elements for Intelligent House Building Set

Checking

9959 Special Elements for Intelligent House Building Set

41 pieces in 31 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

Technic Pins 6 pieces

  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×6

Tiles 5 pieces

  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×1
  • Tile 2 x 2 with Groove Blue Part 3068b Element 306823 ×1
  • Tile 2 x 2 with Groove Light Gray Part 3068b Element 306802 ×1
  • Tile 2 x 2 with Groove Red Part 3068b Element 306821 ×1
  • Tile 2 x 2 with Groove White Part 3068b Element 6548263 or 306801 ×1

Plates 4 pieces

  • Plate 1 x 3 Black Part 3623 Element 362326 ×1
  • Plate 1 x 4 Black Part 3710 Element 371026 ×1
  • Plate 1 x 2 Red Part 3023 Element 302321 ×1
  • Plate 1 x 1 Trans-Clear Part 3024 Element 6513962 or 6252041 ×1

String, Bands and Reels 4 pieces

  • Technic Rubber Belt Medium [26mm ID] [Round Cross Section] Blue Part 85545 Element 6049730 or 4544147 ×4

Bricks 3 pieces

  • Brick 1 x 1 Trans-Red Part 3005 Element 4597292 or 4112801 ×1
  • Brick 1 x 1 White Part 3005 Element 6552096 or 6548258 ×1
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 ×1

Electronics 3 pieces

  • Motor Pulley, 9V Micromotor with axle hole Light Gray Part 2983 Element 298630 ×1
  • Motor Cover, 9V Micromotor 2 x 2 Red Part 2984 Element 4109831 or 298421 ×1
  • Motor Cover, 9V Micromotor 2 x 2 Base Red Part 2985 Element 4109830 or 298521 ×1

Technic Axles 3 pieces

  • Technic Axle 2 Notched Black Part 32062 Element 4109810 or 3206226 ×1
  • Technic Axle 4 Black Part 3705 Element 370526 ×1
  • Technic Axle 3 with Stud Dark Gray Part 6587 Element 4113884 or 658727 ×1

Technic Bushes 3 pieces

  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 ×3

Hinges, Arms and Turntables 2 pieces

  • Hinge Plate 1 x 2 with 3 Fingers [Hollow Studs] Black Part 4275b Element 427526 ×1
  • Hinge Tile 1 x 2 1/2 with 2 Fingers on Top Black Part 4531 Element 453126 ×1

Plates Special 2 pieces

  • Technic Plate 2 x 4 [3 Holes] Black Part 3709 Element 370926 ×1
  • Plate Special 2 x 2 with 1 Pin Hole [Split Underside Ribs] Red Part 2444 Element 244421 ×1

Technic Bricks 2 pieces

  • Technic Brick 1 x 2 [1 Pin Hole] Black Part 3700 Element 370026 ×1
  • Technic Brick 1 x 2 [1 Pin Hole] White Part 3700 Element 6619284 or 370001 ×1

Bricks Round and Cones 1 piece

  • Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×1

Plates Round Curved and Dishes 1 piece

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×1

Technic Connectors 1 piece

  • Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle) Yellow Part 6553 Element 655324 ×1

Technic Gears 1 piece

  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 ×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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