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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.

Particle Ionizer

Checking

6923 Particle Ionizer

174 pieces in 91 part and color combinations, plus 2 minifigures.

LEGO counts 203 pieces. This inventory comes from a separate parts catalog and lists 192, including the 18 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

Plates 31 pieces

  • Plate 1 x 1 Black Part 3024 Element 302426 ×2
  • Plate 1 x 2 Black Part 3023 Element 302326 ×3
  • Plate 2 x 2 Black Part 3022 Element 302226 ×1
  • Plate 2 x 8 Black Part 3034 Element 303426 ×3
  • Plate 6 x 8 Black Part 3036 Element 303676 or 303626 ×1
  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×2
  • Plate 2 x 2 Light Gray Part 3022 Element 302202 ×1
  • Plate 1 x 1 Red Part 3024 Element 302421 ×2
  • Plate 1 x 2 Red Part 3023 Element 302321 ×5
  • Plate 1 x 4 Red Part 3710 Element 371021 ×1
  • Plate 1 x 6 Red Part 3666 Element 366621 ×6
  • Plate 2 x 10 Red Part 3832 Element 383221 ×1
  • Plate 2 x 4 Red Part 3020 Element 302021 ×1
  • Plate 4 x 4 Red Part 3031 Element 4243814 or 303121 ×1
  • Plate 4 x 8 Red Part 3035 Element 303521 ×1

Hinges, Arms and Turntables 22 pieces

  • Hinge Bar with 3 Fingers and End Stud (Control Lever) Black Part 2433 Element 4497182 or 243326 ×1
  • Hinge Brick 1 x 2 Base Black Part 3937 Element 393726 ×4
  • Hinge Plate 1 x 2 with 2 Fingers and Hollow Studs Black Part 4276b Element 4264363 or 4256402 ×1
  • Hinge Tile 1 x 2 1/2 with 2 Fingers on Top Black Part 4531 Element 453126 ×1
  • Hinge Panel 2 x 4 x 3 1/3 with Black/Red MTron Print Light Gray Part 2582pr0001 ×2
  • Turntable 2 x 2 Plate - Top Light Gray Part 3679 Element 367952 or 367902 ×1
  • Turntable 2 x 2 Plate, Base Light Gray Part 3680 Element 4242118 or 368002 ×1
  • Hinge Brick 1 x 2 Top Plate Thin Red Part 3938 Element 6534944 or 6078079 ×4
  • Hinge Plate 1 x 2 with 2 Fingers and Hollow Studs Red Part 4276b Element 4238277 or 427621 ×1
  • Hinge Plate 1 x 2 with 3 Fingers On Side Red Part 2452 Element 4239012 or 245221 ×2
  • Hinge Plate 1 x 2 with 3 Fingers [Hollow Studs] Red Part 4275b Element 4179194 or 427521 ×1
  • Hinge Vehicle Roof Holder 1 x 4 Red Part 4315 Element 4179280 or 431521 ×3

Bricks Sloped 13 pieces

  • Brick Sloped 45° 2 x 2 Red Part 3039 Element 303921 ×2
  • Brick Sloped 45° 2 x 2 with Black Grill Print Red Part 3039pr0009 ×1
  • Brick Sloped 45° 2 x 2 with MTron Logo Print Red Part 3039pr9992 ×2
  • Brick Sloped Inverted 34° 3 x 1 without Internal Stopper Red Part 4287a ×1
  • Brick Sloped Inverted 45° 2 x 1 Red Part 3665 Element 366521 ×4
  • Brick Sloped Inverted 45° 4 x 2 Double with 2 x 2 Recessed Red Part 4871 Element 487121 ×2
  • Brick Sloped Inverted 45° 4 x 4 Double with 4 x 2 Recessed Red Part 4854 Element 4643320 or 4603489 ×1

Bricks Special 12 pieces

  • Brick Special 1 x 1 Studs on 4 Sides Black Part 4733 Element 473326 ×1
  • Brick Special 1 x 1 with Headlight Black Part 4070 Element 407026 ×2
  • Brick Special 1 x 2 x 2/3 with Studs on Sides Black Part 4595 Element 6681661 or 4523339 ×2
  • Brick Special 1 x 2 x 2/3 with Studs on Sides Light Gray Part 4595 Element 459502 ×2
  • Brick Special 1 x 1 with Headlight Red Part 4070 Element 407021 ×4
  • Brick Special 2 x 4 x 2 with Studs on Sides Red Part 2434 Element 4108115 or 243421 ×1

Plates Special 12 pieces

  • Plate Special 1 x 1 with Clip Horizontal [Thick U Clip] Black Part 6019 Element 601976 or 601926 ×2
  • Plate Special 1 x 1 with Clip Vertical [Thick U Clip] Black Part 4085c Element 408526 ×6
  • Plate Special 1 x 4 Offset with Bar Holes Black Part 4590 Element 6002559 or 4278029 ×1
  • Plate Special 1 x 2 Side Handle [Free Ends] Light Gray Part 2540 Element 4140584 or 254052 ×3

Bricks Round and Cones 11 pieces

  • Cone 1 x 1 [No Top Groove] Black Part 4589 Element 4518219 or 458926 ×3
  • Cone 1 x 1 [No Top Groove] Red Part 4589 Element 458921 ×1
  • Brick Round 1 x 1 with Fins, Open Stud Trans-Neon Green Part 4588 Element 4156668 or 4144581 ×1
  • Cone 1 x 1 [No Top Groove] Trans-Neon Green Part 4589 Element 618849 or 458949 ×6

Tiles 11 pieces

  • Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×2
  • Tile 1 x 2 with Groove Red Part 3069b Element 4178178 or 306921 ×3
  • Tile 1 x 4 with Groove Red Part 2431 Element 243121 ×2
  • Tile 2 x 2 with Groove Red Part 3068b Element 306821 ×1
  • Tile 2 x 2 with MTron Logo Print Red Part 3068bpr0074 ×2
  • Tile 1 x 2 with Red and Yellow Control Panel Print (Original) White Part 3069bpr0048 Element 4264367 or 81515 ×1

Bricks 9 pieces

  • Brick 1 x 1 Black Part 3005 Element 300526 ×2
  • Brick 1 x 16 Black Part 2465 Element 246576 or 246526 ×2
  • Brick 1 x 2 Black Part 3004 Element 300426 ×2
  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×2
  • Brick 2 x 3 Red Part 3002 Element 300271 or 300221 ×1

Plates Wedged 9 pieces

  • Wedge, Plate 8 x 8 with 4 x 4 Cutout Black Part 4475 ×1
  • Wedge Plate 3 x 4 without Stud Notches Light Gray Part 4859 ×1
  • Wedge Plate 3 x 3 Cut Corner Red Part 2450 Element 245021 ×2
  • Wedge Plate 3 x 4 without Stud Notches Red Part 4859 ×1
  • Wedge Plate 3 x 6 Cut Corners Red Part 2419 Element 241921 ×4

Tiles Special 9 pieces

  • Tile Special 1 x 2 Grille without Bottom Groove Black Part 2412a ×2
  • Tile Special 1 x 2 with Handle Black Part 2432 Element 243226 ×4
  • Tile Special 2 x 2 with Top Pin Black Part 2460 Element 4258354 or 246026 ×1
  • Tile Special 1 x 1 with Clip and Straight Tips Light Gray Part 2555 Element 255502 ×1
  • Tile Special 1 x 2 Grille without Bottom Groove Red Part 2412a ×1

Transportation - Sea and Air 8 pieces

  • Engine, Strakes, 2 x 2 Thin Top Plate Black Part 4229 Element 4552040 or 4163480 ×2
  • Tail 4 x 2 x 2 Black Part 3479 Element 347976 or 347926 ×2
  • Wing, Tail 4 x 1 x 3 Black Part 2340 Element 6591863 or 4651541 ×2
  • Wing, Tail 4 x 1 x 3 Red Part 2340 Element 6013636 or 4217653 ×2

Plates Round Curved and Dishes 6 pieces

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×4
  • Dish 2 x 2 Inverted [Radar] Trans-Neon Green Part 4740 Element 6245297 or 4112517 ×2

Bars, Ladders and Fences 5 pieces

  • Bar 1 x 3 [Clip / Anti-Stud] Black Part 4735 Element 4141580 or 473576 ×1
  • Fence Lattice 1 x 4 x 1 Black Part 3633 Element 4187209 or 363326 ×1
  • Antenna 8H Whip Trans-Neon Green Part 2569 Element 6265159 or 6164380 ×3

Magnets and Holders 4 pieces

  • Magnet Cylindrical Black Part 73092 Element 73092 ×2
  • Magnet Holder Tile 2 x 2 - Short Arms Black Part 2609a Element 4111912 or 260926 ×1
  • Magnet Holder 2 x 3 Red Part 2607 Element 260721 ×1

Minifig Accessories 3 pieces

  • Equipment Radio [Extended Handle, Compact Speaker Grille] Black Part 3962b Element 396226 ×1
  • Equipment Goblet / Glass Light Gray Part 2343 Element 4191669 or 626902 ×2

Minifig Shields, Weapons, & Tools 3 pieces

  • Tool Chainsaw / Drill Body Black Part 2516 Element 6562846 or 4514341 ×1
  • Tool Hammer / Mallet Large Black Part 4522 Element 452226 ×1
  • Tool Screwdriver and Spanner / Wrench Black Part 4006 Element 6034000 or 4569095 ×1

Containers 2 pieces

  • Box 2 x 2 x 2 Door with Slot and Black/Red MTron Print Light Gray Part 4346pr0004 ×1
  • Box 2 x 2 x 2 [Solid Studs] Red Part 4345a ×1

Tubes and Hoses 2 pieces

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

Bricks Wedged 1 piece

  • Brick Wedged, Sloped Inverted 4 x 4 Triple [2 Connections between Front Studs] Red Part 4855 Element 6021528 or 4258397 ×1

Windscreens and Fuselage 1 piece

  • Windscreen 10 x 4 x 2 1/3 Canopy Trans-Neon Green Part 2507 Element 4107148 or 250749 ×1

Minifigures 2 figures

  • M:Tron Minifigure, checked as a whole figure ×1
  • M:Tron Droid 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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