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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.

Simple and Motorized Mechanisms Base Set

Checking

9686 Simple and Motorized Mechanisms Base Set

409 pieces in 101 part and color combinations.

LEGO counts 396 pieces. This inventory comes from a separate parts catalog and lists 409; 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 77 pieces

  • Plate 1 x 2 Blue Part 3023 Element 302323 ×8
  • Plate 1 x 4 Blue Part 3710 Element 371023 ×4
  • Storage Bin, Dacta, Medium [New Style] Blue Part 54187 ×1
  • Technic Beam 1 x 11.5 Double Bent Thick Blue Part 32009 Element 6271153 or 4112000 ×2
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Blue Part 6629 Element 6279882 or 4182884 ×4
  • Technic Beam 2 x 4 L-Shape Thick Blue Part 32140 Element 6271829 or 4168114 ×8
  • Technic Brick 1 x 12 [11 Pin Holes] Blue Part 3895 Element 389523 ×4
  • Technic Brick 1 x 16 [15 Pin Holes] Blue Part 3703 Element 370323 ×4
  • Technic Brick 1 x 2 [1 Pin Hole] Blue Part 3700 Element 370023 ×4
  • Technic Brick 1 x 4 [3 Pin Holes] Blue Part 3701 Element 370123 ×4
  • Technic Brick 1 x 6 [5 Pin Holes] Blue Part 3894 Element 389423 ×4
  • Technic Brick 1 x 8 [7 Pin Holes] Blue Part 3702 Element 370223 ×4
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×10
  • Technic Plate 2 x 4 [3 Holes] Blue Part 3709 Element 370923 ×6
  • Technic Plate 2 x 6 [5 Holes] Blue Part 32001 Element 4114027 or 3200123 ×8
  • Technic Plate 2 x 8 [7 Holes] Blue Part 3738 Element 373823 ×2

Black 76 pieces

  • Brick Special 2 x 6 x 2 Weight with Sealed Bottom and Dimples on Ends Black Part 73090b Element 6094053 or 73843 ×1
  • Hair Ponytail Black Part 6093 Element 609376 or 609326 ×1
  • String Cord Thin (0.5mm) 200cm Black Part 56823c200 Element 4276325 or 71162 ×1
  • String with End Studs 41L Overall Black Part 14226c41 Element 6096957 or 6074034 ×2
  • Technic Axle 10 Black Part 3737 Element 373726 ×2
  • Technic Axle 12 Black Part 3708 Element 370826 ×6
  • Technic Axle 4 Black Part 3705 Element 370526 ×8
  • Technic Axle 6 Black Part 3706 Element 370626 ×2
  • Technic Axle 8 Black Part 3707 Element 370726 ×2
  • Technic Axle and Pin Connector Angled #3 - 157.5° Black Part 32016 Element 6261386 or 4107082 ×4
  • Technic Axle and Pin Connector Perpendicular 3L with Pin Hole Black Part 32068 Element 6273318 or 4114670 ×2
  • Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×2
  • Technic Gear Rack 1 x 8 with Holes Black Part 6630 Element 4275503 or 4118985 ×1
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×28
  • Technic Steering Arm with 2 Pins Black Part 32069 Element 6278276 or 4114671 ×2
  • Technic Wedge Belt Wheel Tire Black Part 2815 Element 6028041 or 281526 ×4
  • Tyre 30.4 x 14 Offset Tread Black Part 30391 Element 4140670 or 3039126 ×4
  • Tyre 43.2 x 22 ZR Black Part 44309 Element 4184286 ×4

Light Bluish Gray 75 pieces

  • Battery Box, Power Functions 4 x 11 x 7 with Orange Switch and Dark Bluish Gray Covers [Complete Assembly] Light Bluish Gray Part 58119 Element 4506078 ×1
  • Motor, Medium, Power Functions, 3 x 6 x 3 with Dark Bluish Gray Bottom and 20cm Wire Light Bluish Gray Part 58120 Element 6209881 or 6151440 ×1
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×8
  • Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×4
  • Technic Axle Connector Smooth [with x Hole + Orientation] Light Bluish Gray Part 59443 Element 4512360 ×8
  • Technic Beam 3 x 0.5 Liftarm with Boss and Pin Semi-Reduced Light Bluish Gray Part 33299b Element 4563045 ×4
  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 ×16
  • Technic Gear 16 Tooth Reinforced [New Style] Light Bluish Gray Part 94925 Element 4640536 ×2
  • Technic Gear 24 Tooth Crown with Reinforcements [New Style] Light Bluish Gray Part 3650c Element 4211434 ×4
  • Technic Gear 40 Tooth Light Bluish Gray Part 3649 Element 6195314 or 4285634 ×2
  • Technic Gear Rack 1 x 4 Light Bluish Gray Part 3743 Element 6457283 or 4211450 ×2
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 ×8
  • Technic Universal Joint 3L [Complete Assembly] Light Bluish Gray Part 61903 Element 6335279 or 6321309 ×1
  • Technic Wedge Belt Wheel [aka Pulley] Light Bluish Gray Part 4185 Element 6321743 or 4494222 ×4
  • Technic Worm Gear Light Bluish Gray Part 4716 Element 4211510 ×2
  • Wheel 18mm x 14mm with Axle Hole, Fake Bolts and Shallow Spokes Light Bluish Gray Part 55982 Element 4490127 ×4
  • Wheel 30.4 x 20 without Pinholes, with Reinforced Rim Light Bluish Gray Part 56145 Element 4297210 ×4

Red 51 pieces

  • Hat / Cap Short Curved Peak Red Part 86035 Element 4562544 ×1
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×14
  • Technic Axle Connector with Axle Hole Red Part 32039 Element 4118897 ×10
  • Technic Axle and Pin Connector Angled #2 - 180° Red Part 32034 Element 6351572 or 4234429 ×4
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Red Part 42003 Element 6273712 or 4175442 ×4
  • Technic Pin Connector Round [Slotted] Red Part 62462 Element 6173126 or 4526984 ×2
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Red Part 32054 Element 4140806 or 4125198 ×14
  • Technic Rubber Belt Medium [24mm ID] [Round Cross Section] Red Part 85544 Element 4544145 or 4544143 ×2

White 38 pieces

  • Brick 2 x 4 White Part 3001 Element 6552094 or 300101 ×2
  • Brick Round 2 x 2 with Axle Hole White Part 3941 Element 6601920 or 614351 ×2
  • Brick Sloped 45° 2 x 1 with Bottom Pin White Part 3040b Element 6552115 or 4121932 ×4
  • Rubber Belt Small [15mm ID] [Round Cross Section] White Part 85543 Element 6699001 or 4580665 ×2
  • Storage / Sorting Tray, Dacta [For New Style Storage Bins] White Part 54358 ×1
  • Storage / Sorting Tray, Dacta, 13 Cups [For New Style Storage Bins] White Part 54572 ×1
  • Technic Beam 1 x 15 Thick White Part 32278 Element 4542578 or 4227533 ×8
  • Technic Beam 1 x 3 Thick White Part 32523 Element 6632140 or 4208160 ×2
  • Technic Beam 1 x 5 Thick White Part 32316 Element 4249021 or 4140465 ×2
  • Technic Beam 1 x 7 Thick White Part 32524 Element 6564912 or 6318056 ×2
  • Technic Beam 1 x 9 Thick White Part 40490 Element 6001831 or 4156341 ×4
  • Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin White Part 32064a Element 6548286 or 6178921 ×4
  • Tile 1 x 4 with Groove White Part 2431 Element 6548255 or 243101 ×2
  • Torso, Sailboat with Sunset Print, Yellow Arms and Hands White Part 973c01h01pr1204 Element 4275606 ×1
  • Torso, Shirt 3 Flowers over Yellow and Silver Stripe Print, Yellow Arms and Hands White Part 973c01h01pr0805 Element 4275536 ×1

Dark Bluish Gray 33 pieces

  • Technic Axle 3 with Stud Dark Bluish Gray Part 6587 Element 6587199 or 6129590 ×4
  • Technic Axle and Pin Connector Angled #1 Dark Bluish Gray Part 32013 Element 32013199 or 6296856 ×4
  • Technic Beam Triangle Thin [Type II] Dark Bluish Gray Part 99773 Element 6331431 or 6010862 ×2
  • Technic Cam Dark Bluish Gray Part 6575 Element 6575199 or 4210759 ×4
  • Technic Gear 24 Tooth [New Style with Single Axle Hole] Dark Bluish Gray Part 3648b Element 6133119 or 4514558 ×4
  • Technic Gear 8 Tooth Dark Bluish Gray Part 3647 Element 4514559 ×6
  • Technic Gear Differential with Inner Tabs and Open Center, 28 Bevel Teeth Dark Bluish Gray Part 62821a ×1
  • Technic Pin 3/4 Dark Bluish Gray Part 32002 Element 32002199 or 4211050 ×6
  • Technic Reel 3 x 2 Dark Bluish Gray Part 32012 Element 32012199 or 4239891 ×1
  • Wire with Brick 2 x 2 x 2/3 with 1 x 2 Studs and Power Functions and 9V Connectors, 20cm, One Light Bluish Gray End Dark Bluish Gray Part 60656 Element 6209889 or 4514332 ×1

Tan 26 pieces

  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×12
  • Technic Gear 12 Tooth Bevel Tan Part 6589 Element 4565452 or 4514556 ×6
  • Technic Gear 20 Tooth Bevel Tan Part 32198 Element 6031962 or 4514557 ×2
  • Technic Gear 20 Tooth Double Bevel with Axle Hole Type 2 [X Opening] Tan Part 32269 Element 4514555 ×2
  • Technic Pin Long without Friction Ridges Tan Part 32556 ×4

Yellow 20 pieces

  • Minifig Head Standard Grin Print [Hollow Stud] Yellow Part 3626cpr0001 Element 6156652 or 9336 ×2
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 ×16
  • Technic Rubber Belt Large [33mm ID] [Round Cross Section] Yellow Part 85546 Element 4544151 or 70905 ×2

Trans-Dark Blue 10 pieces

  • Science & Technology Panel - Circle Large Trans-Dark Blue Part 57046a ×1
  • Science & Technology Panel - Circle Small Trans-Dark Blue Part 57046b ×2
  • Science & Technology Panel - Curved Trans-Dark Blue Part 57046c ×1
  • Science & Technology Panel - Triangle Large Trans-Dark Blue Part 57046d ×1
  • Science & Technology Panel - Triangle Medium Trans-Dark Blue Part 57046e ×1
  • Science & Technology Panel - Triangle Small Trans-Dark Blue Part 57046f ×4

Green 1 piece

  • Hips and Green Legs Green Part 970c31 Element 6177344 or 6020793 ×1

Orange 1 piece

  • Hips and Orange Legs Orange Part 970c34 Element 6329305 or 4602964 ×1

Trans-Clear 1 piece

  • Storage Bin Lid, Dacta [For New Style Trays] Trans-Clear Part 54190 ×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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