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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.

Planetary Decoder

Checking

6856 Planetary Decoder

75 pieces in 49 part and color combinations, plus 1 minifigure.

The piece count includes the 6 parts inside the set's minifigures, which this inventory lists separately. 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 Round Curved and Dishes 14 pieces

  • Dish 4 x 4 Inverted [Radar] Black Part 3960 Element 396026 ×2
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×2
  • Dish 4 x 4 Inverted [Radar] Trans-Dark Blue Part 3960 Element 4218661 or 3006543 ×1
  • Dish 2 x 2 Inverted [Radar] Trans-Neon Green Part 4740 Element 6245297 or 4112517 ×2
  • Dish 4 x 4 Inverted [Radar] Trans-Neon Green Part 3960 Element 3006549 ×1
  • Plate Round 1 x 1 with Solid Stud Trans-Neon Green Part 6141 Element 6240223 or 3005749 ×2
  • Dish 4 x 4 Inverted [Radar] Trans-Red Part 3960 Element 3006541 ×1
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) White Part 4032a Element 6601914 or 403201 ×3

Hinges, Arms and Turntables 10 pieces

  • Hinge Plate 1 x 2 with 3 Fingers [Hollow Studs] Black Part 4275b Element 427526 ×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
  • Hinge Plate 1 x 2 with 2 Fingers and Hollow Studs White Part 4276b Element 4238278 or 4188547 ×2
  • Hinge Tile 1 x 2 1/2 with 2 Fingers on Top White Part 4531 Element 4240364 or 4188347 ×2

Plates 10 pieces

  • Plate 1 x 6 Black Part 3666 Element 366626 ×2
  • Plate 2 x 6 Black Part 3795 Element 379526 ×2
  • Plate 2 x 8 Black Part 3034 Element 303426 ×1
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×2
  • Plate 1 x 4 White Part 3710 Element 6552108 or 6548266 ×1
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×1
  • Plate 2 x 6 White Part 3795 Element 6550146 or 379501 ×1

Plates Special 9 pieces

  • Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] Black Part 4081b Element 6281993 or 4632571 ×2
  • Plate Special 1 x 4 Offset with Bar Holes Black Part 4590 Element 6002559 or 4278029 ×2
  • Technic Plate 2 x 4 [3 Holes] Black Part 3709 Element 370926 ×1
  • Plate Special 1 x 1 with Clip Horizontal [Thick U Clip] White Part 6019 Element 601951 or 601901 ×1
  • Plate Special 2 x 2 with Bar Frame Octagonal White Part 30033 Element 3003301 ×1
  • Wedge Plate 8 x 6 x 2/3 with Grille White Part 30036 Element 3003601 ×2

Bricks Round and Cones 4 pieces

  • Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×1
  • Cylinder Half 2 x 4 x 4 Trans-Dark Blue Part 6259 Element 6503213 or 6422707 ×2
  • Cone 1 x 1 [No Top Groove] Trans-Neon Green Part 4589 Element 618849 or 458949 ×1

Supports, Girders and Cranes 4 pieces

  • Support Round 2 x 2 x 2 Stand with Reach-Through Center Hole Black Part 3940b Element 394026 ×2
  • Support Round 2 x 2 x 2 Stand with Reach-Through Center Hole White Part 3940b Element 4288059 or 4164236 ×2

Transportation - Sea and Air 4 pieces

  • Tail 4 x 2 x 2 Black Part 3479 Element 347976 or 347926 ×2
  • Tail 4 x 2 x 2 White Part 3479 Element 4107515 or 361301 ×2

Bricks 3 pieces

  • Brick 1 x 6 Black Part 3009 Element 300926 ×1
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 ×1
  • Brick 2 x 3 White Part 3002 Element 6550133 or 300251 ×1

Bricks Special 3 pieces

  • Brick Special 1 x 2 x 2/3 with Studs on Sides Black Part 4595 Element 6681661 or 4523339 ×2
  • Brick Special 2 x 2 with Pin and Axle Hole White Part 6232 Element 6403936 or 4143137 ×1

Stickers 3 pieces

  • Sticker Sheet for Sets 1737-1, 6815-1, 6854-1, 6856-1, 6899-1, 6938-1 [No Color/Any Color] Part 170900 ×1
  • Sticker Sheet for Sets 2154-1, 5129-1, 5384-1, 6856-1, 6900-1, 6915-1, 6958-1, 6975-1, 6982-1, 6999-1 [No Color/Any Color] Part 170909 Element 170909 ×1
  • Sticker Sheets for Sets 1737-1, 5129-1, 6854-1, 6856-1, 6899-1, 6938-1, 6958-1, 6982-1 [No Color/Any Color] Part 170910 Element 170910 ×1

Tiles 3 pieces

  • Tile 2 x 2 with Groove Black Part 3068b Element 306826 ×3

Panels 2 pieces

  • Panel 3 x 5 Solar / Deltoid with Clip [Hexagonal] White Part 30034 Element 3003401 ×2

Plates Wedged 2 pieces

  • Wedge Plate 8 x 8 with 3 x 4 Cutout Black Part 6104 Element 610426 ×1
  • Wedge Plate 3 x 4 without Stud Notches White Part 4859 Element 4215973 or 4199395 ×1

Bars, Ladders and Fences 1 piece

  • Antenna 8H Whip Trans-Neon Green Part 2569 Element 6265159 or 6164380 ×1

Bricks Sloped 1 piece

  • Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom Pin Black Part 3747a ×1

Minifig Accessories 1 piece

  • Equipment Space Scanner White Part 30035 Element 3003501 ×1

Technic Axles 1 piece

  • Technic Axle 6 Black Part 3706 Element 370626 ×1

Minifigures 1 figure

  • Exploriens Spaceman, with Radio on Belt 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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