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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.

Sonic Robot

Checking

6750 Sonic Robot

97 pieces in 44 part and color combinations, plus 2 minifigures.

LEGO counts 103 pieces. This inventory comes from a separate parts catalog and lists 107, including the 10 parts inside the minifigures; 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

Hinges, Arms and Turntables 20 pieces

  • Arm Grab Jaw Black Part 4221 Element 422126 ×4
  • Turntable 2 x 2 Plate, Base Black Part 3680 Element 368076 or 368026 ×1
  • Turntable 2 x 2 Plate - Top Light Gray Part 3679 Element 367952 or 367902 ×1
  • Arm Grab Jaw Holder, 3 Fingers White Part 4220 ×2
  • Arm Holder Brick 2 x 2 with Hole and 1 Arm White Part 792c02 ×2
  • Arm Piece Straight with 2 and 3 Fingers White Part 3612 Element 4174738 ×8
  • Arm Piece with Towball Socket, 3 Fingers White Part 3613 Element 4114147 ×2

Plates 18 pieces

  • Plate 6 x 6 Black Part 3958 Element 395826 ×1
  • Plate 1 x 1 Trans-Green Part 3024 Element 6513967 or 6252046 ×3
  • Plate 1 x 1 Trans-Red Part 3024 Element 6513963 or 6252042 ×2
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×5
  • Plate 1 x 3 White Part 3623 Element 6552105 or 6550144 ×2
  • Plate 2 x 3 White Part 3021 Element 6550136 or 302101 ×4
  • Plate 2 x 6 White Part 3795 Element 6550146 or 379501 ×1

Plates Special 11 pieces

  • Plate Special 1 x 1 with Clip Vertical [Thin U Clip] Black Part 4085b ×2
  • Bracket 2 x 2 - 2 x 2 White Part 3956 Element 6313593 or 395601 ×4
  • Bracket 3 x 2 - 2 x 2 [aka Space Seat] White Part 4598 Element 6101992 or 6024078 ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) White Part 3794a ×3

Bars, Ladders and Fences 8 pieces

  • Bar 1 x 3 [Clip / Anti-Stud] Black Part 4735 Element 4141580 or 473576 ×2
  • Lever Small Base with Black Lever Black Part 298c02 Element 73587 ×4
  • Antenna 1 x 4 with Rounded Top Trans-Red Part 3957a Element 6065498 or 4106520 ×2

Bricks Round and Cones 7 pieces

  • Brick Round 1 x 1 x 2/3 Light Bulb Cover Trans-Green Part 4770 Element 477048 1 spare in the box ×1
  • Brick Round 1 x 1 with Fins, Open Stud Trans-Red Part 4588 Element 458841 ×2
  • Brick Round 1 x 1 x 2/3 Light Bulb Cover Trans-Red Part 4770 Element 4226863 or 477041 1 spare in the box ×1
  • Cone 1 x 1 [No Top Groove] Trans-Red Part 4589 Element 618841 ×2
  • Brick Round 1 x 1 x 2/3 Light Bulb Cover Trans-Yellow Part 4770 Element 477044 1 spare in the box ×1

Tiles 6 pieces

  • Tile 1 x 2 with Arrow Long Yellow with Black Border Print White Part 3069bpr0023 Element 80533 ×2
  • Tile 1 x 2 with Groove White Part 3069b Element 6548264 or 306901 ×2
  • Tile 2 x 2 with Arrow Thin Yellow with Black Border Print White Part 3068bpr0032 ×2

Transportation - Sea and Air 6 pieces

  • Engine, Strakes, 2 x 2 Thin Top Plate Black Part 4229 Element 4552040 or 4163480 ×4
  • Brick Special 1 x 1 with 3 Speakers / Loudspeakers / Space Positioning Rockets White Part 3963 Element 4188288 or 396301 ×2

Bricks Sloped 5 pieces

  • Brick Sloped 33° 3 x 1 White Part 4286 Element 6632142 or 428601 ×2
  • Brick Sloped 45° 2 x 1 with Bottom Pin White Part 3040b Element 6552115 or 4121932 ×2
  • Brick Sloped Inverted 45° 2 x 2 with Computer Screen and Right Side Buttons Print White Part 3660pr0001 ×1

Electronics 5 pieces

  • Battery Box, 9V Small [Complete Assembly] White Part 4760c01 ×1
  • Light Brick 1 x 2 [Single Bulb] White Part 4767 Element 73666 ×1
  • Plate 2 x 4 with Electric Contacts White Part 4757 Element 475701 or 73534 ×1
  • Plate 2 x 8 with Electric Contacts White Part 4758 Element 475801 or 73535 ×1
  • Sound Brick, Round, 9V 2 x 2 x 1 1/3 with Two Space Noises White Part 4774c02 ×1

Minifig Accessories 4 pieces

  • Equipment Weapon, Loudhailer / Speaker / Blaster / Space Gun White Part 4349 Element 434901 ×4

Plates Round Curved and Dishes 2 pieces

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

Transportation - Land 2 pieces

  • Construction Vehicle Bucket, Slope Inverted 33° 3 x 2 Hollow with Towball (Arm Piece) Black Part 4089 ×2

Tubes and Hoses 2 pieces

  • Flexible Hose 8.5L with Tabless Ends (Ends same color as Tube) Trans-Yellow Part 73590c01a ×2

Bricks 1 piece

  • Brick 1 x 2 with Black Grill Print White Part 3004pr9981 ×1

Minifigures 2 figures

  • Classic Spaceman, Blue with Airtanks (3842b Helmet) Minifigure, checked as a whole figure ×1
  • Classic Spaceman, Red with Airtanks (3842b Helmet) Minifigure, checked as a whole figure ×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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