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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.

Universal Building Set with Motor

Checking

8055 Universal Building Set with Motor

189 pieces in 59 part and color combinations.

LEGO counts 191 pieces. This inventory comes from a separate parts catalog and lists 189; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.

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

Light Gray 101 pieces

  • Battery Box, 4.5V, 2 x 4, 3 x C-Cell Polarity Switch Light Gray Part 4352 Element 73261 ×1
  • Battery Box, 4.5V, 4 x 24, 3 x C-Cell with Switch [Complete Assembly] Light Gray Part 4350c02 ×1
  • Brick Round 2 x 2 with Axle Hole Light Gray Part 3941 Element 614302 or 394102 ×1
  • Electric Connector, 2 Way Male Squared Narrow Long [Complete Assembly] Light Gray Part 766c01 ×2
  • Hinge Plate 1 x 2 with 2 Fingers and Hollow Studs Light Gray Part 4276b Element 427602 ×2
  • Hinge Plate 1 x 2 with 3 Fingers [Hollow Studs] Light Gray Part 4275b Element 427502 ×2
  • Motor, 4.5V Type 2 for 2-Prong Connectors with Middle Pin Light Gray Part 6216b ×1
  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×2
  • Plate 1 x 6 Light Gray Part 3666 Element 366602 ×4
  • Plate 2 x 6 Light Gray Part 3795 Element 379502 ×2
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 ×4
  • Technic Axle and Pin Connector Light Gray Part 3651 Element 4105243 or 365102 ×11
  • Technic Brick 1 x 12 [11 Pin Holes] Light Gray Part 3895 Element 4195006 or 389502 ×2
  • Technic Brick 1 x 4 [3 Pin Holes] Light Gray Part 3701 Element 370102 ×6
  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 ×7
  • Technic Bush 1/2 Toothed Type I [+ Opening] Light Gray Part 4265a Element 426502 ×14
  • Technic Gear 16 Tooth with Round Holes [Old Style] Light Gray Part 4019 Element 4107176 or 401902 ×2
  • Technic Gear 24 Tooth Crown with Flat Teeth Light Gray Part 3650a ×1
  • Technic Gear 24 Tooth [Old Style - Three axle holes] Light Gray Part 3648a ×1
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 ×5
  • Technic Gear Rack 1 x 4 Light Gray Part 3743 Element 374302 ×1
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×11
  • Technic Plate 1 x 8 with Toothed Ends Light Gray Part 4442 Element 444252 or 444202 ×3
  • Technic Plate 2 x 4 [3 Holes] Light Gray Part 3709 Element 370902 ×2
  • Technic Steering Arm Light Gray Part 4261 Element 4225506 or 4189316 ×2
  • Technic Wedge Belt Wheel [aka Pulley] Light Gray Part 4185 Element 4100502 or 418502 ×4
  • Wheel with Split Axle hole Light Gray Part 3482 Element 348202 ×6
  • Wire with 2-Prong Connectors, 12V / 4.5V 96L Light Gray Part 766c96 Element 73493 ×1

Red 48 pieces

  • Hinge Brick 1 x 2 Base Red Part 3937 Element 393721 ×1
  • Hinge Brick 1 x 2 Top Plate Thin Red Part 3938 Element 6534944 or 6078079 ×1
  • Plate 1 x 2 Red Part 3023 Element 302321 ×2
  • Plate 1 x 3 Red Part 3623 Element 362321 ×4
  • Plate 1 x 4 Red Part 3710 Element 371021 ×1
  • Plate 1 x 6 Red Part 3666 Element 366621 ×2
  • Plate 2 x 2 Red Part 3022 Element 4613974 or 302221 ×1
  • Plate 2 x 6 Red Part 3795 Element 379521 ×5
  • Technic Brick 1 x 12 [11 Pin Holes] Red Part 3895 Element 389521 ×4
  • Technic Brick 1 x 16 [15 Pin Holes] Red Part 3703 Element 370321 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Red Part 3700 Element 370021 ×7
  • Technic Brick 1 x 4 [3 Pin Holes] Red Part 3701 Element 370121 ×3
  • Technic Brick 1 x 6 [5 Pin Holes] Red Part 3894 Element 389421 ×3
  • Technic Brick 1 x 8 [7 Pin Holes] Red Part 3702 Element 370221 ×4
  • Technic Plate 2 x 4 [3 Holes] Red Part 3709 Element 370921 ×4
  • Technic Plate 2 x 8 [7 Holes] Red Part 3738 Element 373821 ×2
  • Tile 1 x 2 with Groove Red Part 3069b Element 4178178 or 306921 ×2

Black 40 pieces

  • Hinge Plate 1 x 2 with 2 Fingers and Hollow Studs Black Part 4276b Element 4264363 or 4256402 ×2
  • Hinge Plate 1 x 2 with 3 Fingers [Hollow Studs] Black Part 4275b Element 427526 ×2
  • Rubber Band Medium (Square Cross Section) Thin Cut Black Part 70012 Element 70012 2 spares in the box ×4
  • Rubber Band Small 13mm (Square Cross Section) Black Part 71509 Element 4141606 or 4107153 1 spare in the box ×2
  • String Cord Medium Thickness 50cm Black Part 7916c50 ×1
  • Technic Axle 10 Black Part 3737 Element 373726 ×2
  • Technic Axle 12 Black Part 3708 Element 370826 ×2
  • Technic Axle 3 Black Part 4519 Element 6238084 or 451926 ×1
  • Technic Axle 4 Black Part 3705 Element 370526 ×5
  • Technic Axle 6 Black Part 3706 Element 370626 ×4
  • Technic Axle 8 Black Part 3707 Element 370726 ×3
  • Technic Pin with Friction Ridges Lengthwise, without Center Slots Black Part 4459 ×5
  • Technic Worm Gear Black Part 4716 Element 6037533 or 471626 ×1
  • Tyre 30 x 10.5 Offset Tread Black Part 2346 Element 234676 or 234626 ×6

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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