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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.

MT-31 Trike

Checking

7694 MT-31 Trike

88 pieces in 47 part and color combinations, plus 2 minifigures.

The official piece count includes the 7 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

Technic Pins 12 pieces

  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×4
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×2
  • Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 1 spare in the box ×4
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 1 spare in the box ×2

Technic Connectors 10 pieces

  • Technic Axle Connector Double Flexible [Rubber] Black Part 45590 Element 4198367 ×1
  • Technic Axle and Pin Connector Angled #6 - 90° Black Part 32014 Element 6268905 or 4107767 ×4
  • Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle) Light Bluish Gray Part 6553 Element 4211536 ×1
  • Technic Axle and Pin Connector Angled #5 - 112.5° White Part 32015 Element 6271349 or 6003297 ×4

Technic Axles 9 pieces

  • Technic Axle 12 Black Part 3708 Element 370826 ×2
  • Technic Axle 4 Black Part 3705 Element 370526 ×2
  • Technic Axle 6 Black Part 3706 Element 370626 ×3
  • Technic Axle 8 Black Part 3707 Element 370726 ×2

Technic Bushes 7 pieces

  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 1 spare in the box ×2
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 1 spare in the box ×5

Plates 5 pieces

  • Plate 4 x 6 Black Part 3032 Element 303226 ×1
  • Plate 2 x 3 Light Bluish Gray Part 3021 Element 4211396 ×1
  • Plate 1 x 2 Orange Part 3023 Element 4177932 or 4163009 ×2
  • Plate 2 x 6 White Part 3795 Element 6550146 or 379501 ×1

Bricks Round and Cones 4 pieces

  • Cone 1 x 1 [No Top Groove] Trans-Dark Blue Part 4589 Element 618843 ×4

Plates Special 4 pieces

  • Plate Special 1 x 1 with Clip Horizontal [Thick U Clip] Black Part 6019 Element 601976 or 601926 ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Dark Bluish Gray Part 3794a ×2

Technic Bricks 4 pieces

  • Technic Brick 1 x 8 [7 Pin Holes] Black Part 3702 Element 370226 ×2
  • Technic Brick 1 x 4 [3 Pin Holes] White Part 3701 Element 6601913 or 370101 ×2

Hinges, Arms and Turntables 3 pieces

  • Hinge Brick 2 x 2 Locking with 2 Fingers Vertical and Axle Hole, 9 Teeth Black Part 40902 Element 4162235 ×1
  • Hinge Plate 1 x 2 Locking with 1 Finger on Side, with Groove Light Bluish Gray Part 44567a Element 4211814 ×1
  • Hinge Plate 1 x 4 Locking Dual 1 Finger White Part 44568 Element 6276043 or 4193479 ×1

Minifig Accessories 3 pieces

  • Equipment Goblet / Glass Black Part 2343 Element 6247194 or 4223189 ×2
  • Equipment Martian Hypersled with Pin (Mars Mission) White Part 58843 Element 4501924 ×1

Tiles 3 pieces

  • Tile 1 x 6 with Groove Black Part 6636 Element 663626 ×1
  • Tile 1 x 2 with Groove White Part 3069b Element 6548264 or 306901 ×2

Wheels and Tyres 3 pieces

  • Wheel Hard Plastic Large (54mm D. x 30mm) Orange Part 2515 Element 4504602 ×3

Bricks 2 pieces

  • Brick 2 x 4 Light Bluish Gray Part 3001 Element 4211385 ×1
  • Brick 2 x 6 White Part 2456 Element 6552122 or 4249698 ×1

Bricks Sloped 2 pieces

  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Orange Part 54200 Element 4504371 or 4248195 ×2

Bricks Special 2 pieces

  • Brick Special 1 x 1 with Headlight Black Part 4070 Element 407026 ×2

Bricks Wedged 2 pieces

  • Brick Wedged, Curved 6 x 2 Left, Inner Ridges White Part 41748 Element 6552117 or 4160124 ×1
  • Brick Wedged, Curved 6 x 2 Right, Inner Ridges White Part 41747 Element 4160101 ×1

Technic Special 2 pieces

  • Technic Disc 3 x 3 Black Part 2723 Element 4218868 or 4121619 ×1
  • Cylinder 9 x 4 x 2 Tapered with Flat Bottom, Pin Holes Trans-Orange Part 58947 Element 4502233 ×1

Technic Steering, Suspension and Engine 2 pieces

  • Technic Steering Pulley Large White Part 3736 Element 4542733 or 4160689 ×2

Tiles Special 2 pieces

  • Tile Special 1 x 2 Grille with Bottom Groove Orange Part 2412b Element 4125254 or 3933106 ×2

Tubes and Hoses 2 pieces

  • Hose, Ribbed 7mm D. 4L / 3.2cm Black Part 78c04 Element 4506910 or 4282813 ×2

Bars, Ladders and Fences 1 piece

  • Lever Small Base with Black Lever Blue Part 298c02 Element 4296152 or 4163988 1 spare in the box ×1

Plates Wedged 1 piece

  • Wedge Plate 3 x 6 Cut Corners White Part 2419 Element 6552090 or 241901 ×1

Rock 1 piece

  • Rock 1 x 1 Jewel / Gem 24 Facet Trans-Neon Green Part 30153 Element 6247790 or 4114505 ×1

Stickers 1 piece

  • Sticker Sheet for Set 7694-1 [No Color/Any Color] Part 59620 Element 4506052 ×1

Windscreens and Fuselage 1 piece

  • Windscreen 6 x 6 x 3 Canopy Half Sphere with Dual 2 Fingers Trans-Orange Part 50747 Element 4505156 ×1

Minifigures 2 figures

  • Martian Minifigure, checked as a whole figure ×1
  • Mars Astronaut, Balaclava 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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