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The Workshop Sheet 10 of 22

LEGO Missing Piece Checker

Enter a set number, mark each piece found or missing, and leave with a list of what is missing, the element IDs LEGO asks for and links to buy the parts. It is free and needs no account. Rule out the usual hiding places first.

Mobile Lab

Checking

6901 Mobile Lab

129 pieces in 43 part and color combinations, plus 2 minifigures.

LEGO counts 135 pieces. This inventory comes from a separate parts catalog and lists 139, 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

Light Gray 96 pieces

  • Antenna 1 x 4 with Rounded Top Light Gray Part 3957a Element 395702 ×1
  • Arm Holder Brick 2 x 2 with Hole and 1 Arm Light Gray Part 792c02 ×1
  • Arm Piece Straight with 2 and 3 Fingers Light Gray Part 3612 Element 4109694 or 610102 ×5
  • Arm Piece with Towball Socket, 3 Fingers Light Gray Part 3613 ×1
  • Brick 1 x 1 Light Gray Part 3005 Element 300502 ×2
  • Brick 1 x 2 Light Gray Part 3004 Element 300402 ×5
  • Brick 1 x 2 with Classic Space Logo Print Light Gray Part 3004pr9970 ×2
  • Brick 1 x 4 Light Gray Part 3010 Element 301002 ×3
  • Brick Round 1 x 1 Open Stud Light Gray Part 3062b Element 306202 ×1
  • Brick Sloped 33° 3 x 2 with Classic Space Logo Print Light Gray Part 3298pr0039 ×2
  • Brick Special 1 x 1 with Headlight Light Gray Part 4070 Element 407002 ×2
  • Construction Vehicle Digger Bucket, Slope Inverted 33° 3 x 2 Hollow with Towball (Arm Piece) Light Gray Part 4089 ×1
  • Dish 4 x 4 Inverted [Radar] Light Gray Part 3960 Element 4143013 or 396002 ×1
  • Hinge Brick 1 x 4 [Lower] Light Gray Part 3831 Element 383102 ×4
  • Hinge Brick 1 x 4 [Upper] Light Gray Part 3830 Element 383002 ×4
  • Plate 1 x 2 Light Gray Part 3023 Element 302302 ×5
  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×6
  • Plate 1 x 6 Light Gray Part 3666 Element 366602 ×4
  • Plate 2 x 2 Light Gray Part 3022 Element 302202 ×3
  • Plate 2 x 3 Light Gray Part 3021 Element 302102 ×1
  • Plate 2 x 8 Light Gray Part 3034 Element 303402 ×2
  • Plate 6 x 12 Light Gray Part 3028 Element 302802 ×1
  • Plate 6 x 8 Light Gray Part 3036 Element 303652 or 303602 ×1
  • Plate Round 1 x 1 with Towball and Hexagonal Hole [Maxifig Hand] Light Gray Part 3614b Element 361402 ×1
  • Plate Special 1 x 1 with Clip Vertical [Thin Open O Clip] Light Gray Part 4085a ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Light Gray Part 3794a Element 379402 ×2
  • Plate Special 1 x 2 with Handles [Flat Ends / Low Attachment] Light Gray Part 3839b Element 383902 ×2
  • Plate Special 2 x 2 with Wheels Red Light Gray Part 122c01 ×6
  • Steering Stand 1 x 2 with Black Steering Wheel Light Gray Part 3829c01 Element 9556 ×1
  • Support Round 2 x 2 x 2 Stand with Blocked Center Hole Light Gray Part 3940a ×6
  • Tile 1 x 1 with Groove Light Gray Part 3070b Element 307052 or 307002 ×4
  • Tile 1 x 2 with Groove Light Gray Part 3069b Element 306902 ×11
  • Weapon Gun / Torch (Space) [with Grooves] Light Gray Part 3959 Element 4254948 or 395952 ×3

Black 14 pieces

  • Equipment Radio [Compact Handle] Black Part 3962a ×1
  • Tool Screwdriver and Spanner / Wrench Black Part 4006 Element 6034000 or 4569095 ×1
  • Tyre 15 x 6 Offset Tread Small Black Part 3641 Element 4501046 or 364126 ×12

Trans-Green 11 pieces

  • Brick 1 x 2 without Bottom Tube Trans-Green Part 3065 Element 6514266 or 6244908 ×4
  • Brick 1 x 4 without Bottom Tubes Trans-Green Part 3066 Element 4561490 or 4184013 ×2
  • Brick Round 1 x 1 Open Stud Trans-Green Part 3062b Element 6514234 or 6238046 ×2
  • Brick Sloped 33° 3 x 6 Trans-Green Part 3939 Element 4116790 ×1
  • Plate 1 x 1 Trans-Green Part 3024 Element 6513967 or 6252046 ×2

Trans-Red 8 pieces

  • Brick Round 1 x 1 Open Stud Trans-Red Part 3062b Element 6514235 or 6238673 ×2
  • Plate 1 x 1 Trans-Red Part 3024 Element 6513963 or 6252042 ×6

Minifigures 2 figures

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