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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.

Seismologic Vehicle (Sismobile)

Checking

6844 Seismologic Vehicle (Sismobile)

41 pieces in 25 part and color combinations, plus 1 minifigure.

LEGO counts 44 pieces. This inventory comes from a separate parts catalog and lists 46, 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

Blue 19 pieces

  • Box 2 x 2 x 2 Door with Slot Blue Part 4346 Element 434623 ×2
  • Box 2 x 2 x 2 [Solid Studs] Blue Part 4345a ×2
  • Brick 1 x 2 Blue Part 3004 Element 4613959 or 300423 ×2
  • Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom Pin Blue Part 3747a Element 4500460 or 374723 ×1
  • Hinge Plate 1 x 2 with 1 Large Finger Blue Part upn0344 ×1
  • Hinge Plate 1 x 2 with 2 Fingers at Outer Edges Blue Part upn0343 ×1
  • Plate 1 x 1 Blue Part 3024 Element 302423 ×1
  • Plate 1 x 4 Blue Part 3710 Element 371023 ×1
  • Plate 2 x 2 Blue Part 3022 Element 4613973 or 302223 ×1
  • Plate 2 x 6 Blue Part 3795 Element 379523 ×1
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Blue Part 3794a ×5
  • Support 2 x 4 x 5 Stanchion Inclined [3mm wide posts] Blue Part 4476a ×1

Light Gray 16 pieces

  • Antenna 1 x 4 with Rounded Top Light Gray Part 3957a Element 395702 ×1
  • Brick Round 1 x 1 Open Stud Light Gray Part 3062b Element 306202 ×2
  • Dish 6 x 6 Inverted, Radar / Webbed [No Anti-studs] Light Gray Part 4285a ×1
  • Equipment Metal Detector Light Gray Part 4479 Element 4118715 or 447902 ×2
  • Hinge Plate 2 x 4 with Articulated Joint - Female Light Gray Part 3640 Element 364002 ×1
  • Hinge Plate 2 x 4 with Articulated Joint - Male Light Gray Part 3639 Element 363902 ×1
  • Plate 1 x 2 Light Gray Part 3023 Element 302302 ×2
  • Plate Special 1 x 1 with Clip Vertical [Thin Open O Clip] Light Gray Part 4085a ×2
  • Plate Special 1 x 2 with Handles [Flat Ends / Low Attachment] Light Gray Part 3839b Element 383902 ×1
  • Plate Special 2 x 2 with Wheels Red Light Gray Part 122c01 ×2
  • Steering Stand 1 x 2 with Black Steering Wheel Light Gray Part 3829c01 Element 9556 ×1

Black 4 pieces

  • Wheel Balloon with Axle hole Black Part 4288 Element 4113076 or 428876 ×4

Trans-Red 2 pieces

  • Brick Round 1 x 1 Open Stud Trans-Red Part 3062b Element 6514235 or 6238673 ×2

Minifigures 1 figure

  • Classic Spaceman, White with Airtanks (3842a 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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