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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.

Crystal Detector

Checking

6150 Crystal Detector

101 pieces in 55 part and color combinations, plus 1 minifigure.

LEGO counts 104 pieces. This inventory comes from a separate parts catalog and lists 106, including the 5 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

Black 40 pieces

  • Arm Grab Jaw Black Part 4221 Element 422126 ×2
  • Arm Holder Brick 1 x 2 with 2 Horizontal Fingers Black Part 30014 Element 3001426 ×2
  • Arm Piece Straight with 2 and 3 Fingers Black Part 3612 Element 610126 ×4
  • Arm Piece with Pin, 3 Fingers Black Part 6217 Element 4107590 or 4101774 ×1
  • Brick 1 x 2 Black Part 3004 Element 300426 ×1
  • Brick 2 x 4 Black Part 3001 Element 300126 ×1
  • Brick 2 x 4 x 2 with Holes on Sides Black Part 6061 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Black Part 3660 Element 366026 ×7
  • Cockpit 6 x 6 x 3 1/3 Octagonal Canopy Base Black Part 30200 Element 4124388 or 4109932 ×1
  • Equipment Compass with White Lines, Yellow Letters Print Black Part 70001pr0001 Element 75171 ×1
  • Hinge Tile 1 x 4 Black Part 4625 Element 4280138 or 462526 ×1
  • Minifig Footwear Flipper [Thin] Black Part 59275 ×4
  • Plate 2 x 2 Black Part 3022 Element 302226 ×1
  • Plate Special 1 x 2 Side Handle [Free Ends] Black Part 2540 Element 4140588 or 254026 ×1
  • Plate Special 1 x 4 Offset with Bar Holes Black Part 4590 Element 6002559 or 4278029 ×1
  • Propeller Housing Black Part 6040 Element 4144525 or 604026 ×2
  • Tile 2 x 2 with Aquazone Silver and Copper Circular Print Black Part 3068bpr9881 Element 4113930 ×1
  • Tile Special 1 x 2 Grille with Bottom Groove Black Part 2412b Element 241226 ×2
  • Turntable 4 x 4 Square Base with Top, Complete Assembly Black Part 3403c01 Element 4221663 or 4143677 ×1
  • Wheel Hard Plastic Small (22mm D. x 24mm) Black Part 6118 Element 4106928 or 611876 ×4

Yellow 20 pieces

  • Arm Grab Jaw Holder, 3 Fingers Yellow Part 4220 Element 4107528 or 422024 ×1
  • Bracket 1 x 2 - 1 x 4 [Square Corners] Yellow Part 2436 Element 4282745 or 243624 ×2
  • Brick Sloped 33° 3 x 2 with Divers Bubbles Print Yellow Part 3298pr0038 Element 4110062 ×2
  • Brick Sloped 45° 2 x 2 Yellow Part 3039 Element 303924 ×4
  • Brick Special 1 x 2 with Pin Yellow Part 2458 Element 245824 ×1
  • Brick Special Octagonal 2 x 2 x 3 1/3 with Side Studs Yellow Part 6042 Element 4247901 or 604224 ×2
  • Cone 2 x 2 x 1 2/3 Octagonal, Open Stud Yellow Part 6039 Element 4247936 or 4105159 ×2
  • Plate 1 x 2 Yellow Part 3023 Element 302324 ×2
  • Plate 2 x 4 Yellow Part 3020 Element 302024 ×1
  • Plate Special 1 x 2 with Bar Up [Horizontal Arm 6mm] Yellow Part 4623 Element 4501109 or 4497185 ×1
  • Plate Special 6 x 6 Octagonal with Opening Yellow Part 30062 Element 4109978 ×1
  • Technic Brick 1 x 1 with Pin Hole Yellow Part 6541 Element 654124 ×1

Light Gray 17 pieces

  • Brick 1 x 4 Light Gray Part 3010 Element 301002 ×1
  • Brick 2 x 10 Light Gray Part 3006 Element 300602 ×1
  • Hose, Pneumatic 4mm D. 19L / 15.2cm Light Gray Part 5102c19 Element 4107576 or 4107201 ×1
  • Plate 1 x 2 Light Gray Part 3023 Element 302302 ×2
  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×1
  • Plate 2 x 6 Light Gray Part 3795 Element 379502 ×2
  • Plate 4 x 12 Light Gray Part 3029 Element 302902 ×2
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 ×2
  • Tile Special 1 x 1 with Clip and Straight Tips Light Gray Part 2555 Element 255502 ×3
  • Wedge Plate 3 x 6 Cut Corners Light Gray Part 2419 Element 241902 ×2

Trans-Green 14 pieces

  • Arm Piece 90° Turn [2 / 3 Fingers] Trans-Green Part 412 Element 4109975 ×6
  • Box 2 x 2 x 2 Door with Slot Trans-Green Part 4346 Element 4109976 ×1
  • Box 2 x 2 x 2 [Hollow Studs] Trans-Green Part 4345b Element 4109977 ×1
  • Equipment Suction Cup Gun Trans-Green Part 71594c01 Element 4114129 ×1
  • Propeller 3 Blade 3 Diameter with Axle Cross Trans-Green Part 6041 Element 4109974 ×3
  • Windscreen 4 x 4 x 3 Canopy Trans-Green Part 2620 Element 4190481 or 4109973 ×1
  • Windscreen 6 x 6 Octagonal Canopy with Axle Hole and Hydronauts Print Trans-Green Part 2418bpr0001 Element 4110063 ×1

Chrome Silver 5 pieces

  • Dish 2 x 2 x 2/3 Light Reflector Chrome Silver Part 71128 Element 71128 ×2
  • Rock 1 x 1 Crystal 5 Point Chrome Silver Part 30385 Element 4119342 ×1
  • Weapon Harpoon [4 Grooves on Shaft] Chrome Silver Part 57467 ×2

Dark Gray 2 pieces

  • Brick Special 2 x 4 with Pins Dark Gray Part 6249 Element 4143669 or 4100411 ×2

Trans-Neon Orange 2 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Neon Orange Part 6141 Element 6240218 or 3005747 1 spare in the box ×2

Blue 1 piece

  • Tile 2 x 2 with Groove Blue Part 3068b Element 306823 ×1

Minifigures 1 figure

  • Hydronaut 1 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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