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The Workshop Sheet 10 of 19

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.

Life on Mars Clock

Checking

7400 Life on Mars Clock

33 pieces in 19 part and color combinations, plus 2 minifigures.

The piece count includes the 10 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 7 pieces

  • Plate 1 x 2 Black Part 3023 Element 302326 ×4
  • Plate 2 x 2 Corner Tan Part 2420 Element 4114077 or 242005 ×2
  • Plate 4 x 4 Tan Part 3031 Element 4243824 or 4113919 ×1

Hinges, Arms and Turntables 6 pieces

  • Hinge Plate 1 x 2 Locking with 1 Finger On Top Black Part 30383 Element 6338799 or 4144575 ×2
  • Hinge Brick 1 x 2 Locking with 2 Fingers Vertical End, 9 Teeth Dark Gray Part 30365 Element 4144501 or 4125291 ×2
  • Hinge Cylinder 1 x 3 Locking with 1 Finger and 2 Fingers On Ends, without Hole, 9 Teeth Dark Gray Part 30554a ×2

Plates Special 3 pieces

  • Plate Special 1 x 2 Side Handle [Free Ends] Brown Part 2540 Element 4140591 or 4124489 ×3

Bricks Sloped 2 pieces

  • Brick Sloped 33° 3 x 1 Dark Gray Part 4286 Element 4108045 or 428627 ×2

Plates Round Curved and Dishes 2 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Neon Orange Part 6141 Element 6240218 or 3005747 ×1
  • Dish 2 x 2 Inverted [Radar] White Part 4740 Element 6601845 or 474001 ×1

Plates Wedged 2 pieces

  • Wedge Plate 3 x 3 Cut Corner Brown Part 2450 Element 4256579 or 4125222 ×2

Technic Gears 2 pieces

  • Technic Gear 40 Tooth Red Part 3649 Element 4120108 ×2

Technic Pins 2 pieces

  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 ×2

Tiles Special 2 pieces

  • Tile Special 1 x 2 Grille with Bottom Groove Tan Part 2412b Element 4124456 or 393305 ×2

Baseplates 1 piece

  • Baseplate 8 x 16 Light Gray Part 3865 Element 4219739 or 4179592 ×1

Minifig Accessories 1 piece

  • Equipment Metal Detector Light Gray Part 4479 Element 4118715 or 447902 ×1

Minifig Upper Body 1 piece

  • Arm Mechanical with 2 Clips [Battle Droid] Dark Turquoise Part 30377 Element 4142991 ×1

Tiles 1 piece

  • Tile 1 x 2 with Elliptical Display Print Dark Gray Part 3069bpr0046 Element 4142971 ×1

Tiles Round and Curved 1 piece

  • Tile Round 2 x 2 with Bottom Cross Black Part 4150 Element 415076 or 415026 ×1

Minifigures 2 figures

  • Spaceman, Doc Minifigure, checked as a whole figure ×1
  • Martian 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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