BlockTalk Find Your Set

Free tool

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.

Exploration Mars

Checking

9736 Exploration Mars

158 pieces in 58 part and color combinations.

LEGO counts 155 pieces. This inventory comes from a separate parts catalog and lists 158; 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.

Show

Piece checklist

Bricks 26 pieces

  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×8
  • Brick 2 x 2 Red Part 3003 Element 4103590 or 300371 ×8
  • Brick 2 x 4 Red Part 3001 Element 300121 ×10

Technic Gears 22 pieces

  • Technic Worm Gear Black Part 4716 Element 6037533 or 471626 ×2
  • Technic Gear 12 Tooth Bevel Light Gray Part 6589 Element 658902 ×4
  • Technic Gear 16 Tooth with Round Holes [Old Style] Light Gray Part 4019 Element 4107176 or 401902 ×2
  • Technic Gear 24 Tooth Crown with Reinforcements [New Style] Light Gray Part 3650c Element 365002 ×2
  • Technic Gear 24 Tooth [New Style with Single Axle Hole] Light Gray Part 3648b Element 4107543 or 364802 ×6
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 1 spare in the box ×3
  • Technic Gear Rack 1 x 4 Light Gray Part 3743 Element 374302 ×2
  • Technic Gear Rack 1 x 8 with Holes Light Gray Part 6630 Element 663002 ×1

Technic Axles 14 pieces

  • Technic Axle 10 Black Part 3737 Element 373726 ×2
  • Technic Axle 12 Black Part 3708 Element 370826 ×2
  • Technic Axle 3 Black Part 4519 Element 6238084 or 451926 ×2
  • Technic Axle 4 Black Part 3705 Element 370526 ×2
  • Technic Axle 6 Black Part 3706 Element 370626 ×2
  • Technic Axle 8 Black Part 3707 Element 370726 ×2
  • Technic Axle 3 with Stud Dark Gray Part 6587 Element 4113884 or 658727 ×2

Wheels and Tyres 14 pieces

  • Tyre 43.2 x 28 Balloon Small Black Part 6579 Element 657926 ×6
  • Technic Wedge Belt Wheel [aka Pulley] Light Gray Part 4185 Element 4100502 or 418502 ×2
  • Wheel 43.2 x 28 Balloon Small Yellow Part 6580 Element 4496701 or 4183681 ×6

Technic Connectors 11 pieces

  • Technic Axle and Pin Connector Angled #1 Blue Part 32013 Element 6332570 or 4107797 ×2
  • Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle) Light Gray Part 6553 Element 655302 ×1
  • Technic Axle Connector Ridged [with x Hole x Orientation] Light Gray Part 6538b Element 4113804 or 4100408 ×4
  • Technic Axle and Pin Connector Angled #2 - 180° Light Gray Part 32034 Element 4107830 ×4

Plates Wedged 8 pieces

  • Wedge Plate 3 x 6 Cut Corners Black Part 2419 Element 241926 ×4
  • Wedge Plate 8 x 4 Wing Left Black Part 3933 Element 4189089 or 393326 ×2
  • Wedge Plate 8 x 4 Wing Right with Stud Notch Black Part 3934 Element 4189090 or 393426 ×2

Technic Steering, Suspension and Engine 8 pieces

  • Technic Steering Arm with 2 Pins Black Part 32069 Element 6278276 or 4114671 ×2
  • Technic Shock Absorber 6.5L with Normal Spring [Complete Assembly] Light Gray Part 73129 Element 73129 ×4
  • Technic Universal Joint 4L [Complete Assembly] Light Gray Part 9244 Element 9244 ×2

Bricks Round and Cones 6 pieces

  • Brick Round 2 x 2 with Axle Hole Red Part 3941 Element 614321 or 394121 ×4
  • Cone 1 x 1 [No Top Groove] Trans-Neon Green Part 4589 Element 618849 or 458949 ×2

Supports, Girders and Cranes 6 pieces

  • Support 2 x 2 x 5 Lattice Pillar, Complete Assembly Black Part 2580c01 Element 4106984 ×2
  • Support Leg Large [Insectoids] Dark Gray Part 30212 Element 4114698 ×4

Technic Bricks 6 pieces

  • Technic Brick 1 x 16 [15 Pin Holes] Black Part 3703 Element 370326 ×2
  • Technic Brick 1 x 10 [9 Pin Holes] Red Part 2730 Element 273021 ×2
  • Technic Brick 1 x 8 [7 Pin Holes] Red Part 3702 Element 370221 ×2

Tiles 5 pieces

  • Tile 1 x 2 with Groove Light Gray Part 3069b Element 306902 ×2
  • Tile 1 x 2 with Blue and Yellow Control Panel Print White Part 3069bpr0047 Element 81908 ×1
  • Tile 1 x 2 with Red and Yellow Control Panel Print (Original) White Part 3069bpr0048 Element 4264367 or 81515 ×1
  • Tile 1 x 2 with Telemetry Panel Print White Part 3069bpr0043 Element 81575 ×1

Electronics 4 pieces

  • Wire with Brick 2 x 2 x 2/3 Pair, 378L Black Part 5306bc378 Element 4110080 ×2
  • Motor Pulley, 9V Micromotor with axle hole Light Gray Part 2983 Element 298630 ×2

Hinges, Arms and Turntables 4 pieces

  • Turntable 2 x 2 Plate, Base Blue Part 3680 Element 368023 ×2
  • Turntable 2 x 2 Plate - Top Light Gray Part 3679 Element 367952 or 367902 ×2

Magnets and Holders 4 pieces

  • Magnet Cylindrical Black Part 73092 Element 73092 ×2
  • Magnet Holder 2 x 3 Red Part 2607 Element 260721 ×2

Plates 4 pieces

  • Plate 6 x 16 Black Part 3027 Element 302726 ×4

String, Bands and Reels 4 pieces

  • Technic Rubber Belt Medium [24mm ID] [Round Cross Section] Red Part 85544 Element 4544145 or 4544143 ×2
  • Rubber Belt Small [15mm ID] [Round Cross Section] White Part 85543 Element 6699001 or 4580665 3 spares in the box ×2

Bars, Ladders and Fences 2 pieces

  • Antenna 8H Whip Trans-Neon Green Part 2569 Element 6265159 or 6164380 ×2

Bricks Sloped 2 pieces

  • Brick Sloped 33° 3 x 2 Red Part 3298 Element 329821 ×2

Plates Round Curved and Dishes 2 pieces

  • Dish 6 x 6 Inverted, Radar / Webbed [Anti-studs at 90°] Black Part 4285b Element 6603362 or 4509865 ×2

Plates Special 2 pieces

  • Technic Plate 2 x 8 [7 Holes] Red Part 3738 Element 373821 ×2

Technic Special 2 pieces

  • Technic Gearbox 2 x 4 x 3 1/3 Yellow Part 6588 Element 658824 ×2

Gear Parts 1 piece

  • CD-Rom, for 9736 [No Color/Any Color] Part upn0133 ×1

Panels 1 piece

  • Panel, Trapezoid, Tipper End Flat without Pins Yellow Part 30022 Element 6293858 or 6095756 ×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.

We value your privacy

We use cookies 🍪 for analytics and to improve your experience. Read our privacy policy