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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.

Deep-Sea Research Submarine

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42201 Deep-Sea Research Submarine

413 pieces in 111 part and color combinations.

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

Black 123 pieces

  • Bar 2L with Stop in Center Black Part 78258 Element 6371584 1 spare in the box ×2
  • Brick Round Curved 1 x 1 x 1 1/3 Quarter Dome Black Part 1871 Element 6436425 ×6
  • Equipment Paint Roller Brush Handle Smooth Handle Black Part 34076 Element 6192778 ×2
  • Plate Special Round 2 x 2 with Center Stud (Jumper Plate) Black Part 18674 Element 6195325 ×2
  • Steering Wheel Small, 2 x 2 [Reinforced] Black Part 16091 Element 6057397 ×1
  • Technic Axle 6 Black Part 3706 Element 370626 ×1
  • Technic Axle Connector Double Flexible [Rubber] Black Part 45590 Element 4198367 ×2
  • Technic Axle Connector with Axle Hole [Reinforced] Black Part 42135 Element 6331716 ×2
  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle Black Part 18651 Element 6089119 ×5
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Black Part 42003 Element 6273708 or 4200326 ×2
  • Technic Axle and Pin Connector Perpendicular Double Black Part 32291 Element 6280394 or 4140430 ×4
  • Technic Axle and Pin Connector Perpendicular Double Split [Reinforced] Black Part 69819 Element 6349281 ×2
  • Technic Beam 1 x 5 Thin with Axle Holes on Ends Black Part 11478 Element 6327028 or 6030286 ×4
  • Technic Beam 1 x 7 Thick Black Part 32524 Element 4495935 or 4155458 ×3
  • Technic Beam 1 x 9 Bent (7 - 3) Thick Black Part 32271 Element 6276835 or 4140327 ×2
  • Technic Beam 3 x 3 L-Shape Thin Black Part 32056 Element 6271810 or 4112287 ×4
  • Technic Beam 3 x 3 T-Shape Thick Black Part 60484 Element 4552347 or 4535771 ×2
  • Technic Beam Frame 3 x 13 with 1 Center Cross Beams, 2 Openings Thick Black Part 4526 Element 6452876 ×2
  • Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×10
  • Technic Link 1 x 6 without Stoppers Black Part 32005a Element 4629921 or 4530733 ×2
  • Technic Pin Connector Hub with 1 Axle Black Part 22961 Element 6253260 ×4
  • Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Small Squared Pin Holes] Black Part 44874 Element 6366229 ×1
  • Technic Pin Connector Perpendicular 2 x 4 Bent - Beam with 90 Hole Ø 4.8 Black Part 11455 Element 6172966 or 6019986 ×4
  • Technic Pin Connector Round [Slotted] Black Part 62462 Element 6173119 or 4526982 ×2
  • Technic Pin Connector Toggle Joint Smooth Double with Axle and Pin Holes Black Part 87408 Element 6278412 or 4558692 ×2
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole] Black Part 65304 Element 6321745 ×17
  • Technic Pin with Friction Ridges Lengthwise with No Center Slots Black Part 61332 Element 6279875 1 spare in the box ×32
  • Technic Tooth 1 x 3 with Axle Hole [Hollow Underside] Black Part 48267 Element 6288220 ×1

Red 51 pieces

  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×14
  • Technic Axle 4 Red Part 3705 Element 6129995 or 4265797 ×3
  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Red Part 11214 Element 6209519 ×7
  • Technic Pin 1/2 with Friction Red Part 89678 Element 6378120 1 spare in the box ×24
  • Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Small Squared Pin Holes] Red Part 44874 Element 6323573 ×1
  • Technic Pin with Friction Ridges Lengthwise and Towball - Round Pin Hole Red Part 66906 Element 6360104 ×2

Yellow 48 pieces

  • Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end Yellow Part 25214 Element 6253294 or 6173898 ×6
  • Technic Axle 5 Yellow Part 32073 Element 6130008 ×9
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Yellow Part 42003 Element 6273711 or 4200324 ×5
  • Technic Beam 1 x 11.5 Double Bent Thick Yellow Part 32009 Element 6271150 or 6257104 ×2
  • Technic Beam 1 x 3 Thick Yellow Part 32523 Element 4153707 ×2
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Yellow Part 6629 Element 6524459 or 6375945 ×2
  • Technic Beam 3 x 3 L-Shape Thin Yellow Part 32056 Element 6271812 or 4112289 ×4
  • Technic Panel Fairing #7 3L Very Small Smooth, Side A Yellow Part 2387 Element 6510995 or 6430389 ×3
  • Technic Panel Fairing #8 3L Very Small Smooth, Side B Yellow Part 2389 Element 6513879 or 6430392 ×3
  • Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge] Yellow Part 65487 Element 6282151 ×4
  • Technic Pin Connector Round 1L [Beam] Yellow Part 18654 Element 6431481 1 spare in the box ×6
  • Technic Pin Connector Round [Slotted] Yellow Part 62462 Element 6173122 or 4526983 ×2

Blue 44 pieces

  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×25
  • Technic Beam 1 x 2 Thin Blue Part 41677 Element 6360123 or 4186834 ×4
  • Technic Driving Ring Connector Smooth [2 rounded and 2 flat side walls] Blue Part 42195 Element 6488702 ×2
  • Technic Pin Connector Round 1L [Beam] Blue Part 18654 Element 6392879 1 spare in the box ×3
  • Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot Blue Part 42924 Element 6299413 ×7
  • Wheel 41 x 15 Blue Part 68327 Element 6518392 ×3

Dark Bluish Gray 43 pieces

  • Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / Grate Dark Bluish Gray Part 61409 Element 4540386 or 4521185 ×2
  • Technic Axle 5.5 with Stop [Rounded Short End] Dark Bluish Gray Part 59426 Element 4508553 ×1
  • Technic Axle Connector Smooth [with x Hole + Orientation] Dark Bluish Gray Part 59443 Element 6084613 or 4516546 ×9
  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Dark Bluish Gray Part 11214 Element 6015356 ×2
  • Technic Axle and Pin Connector Angled #2 - 180° Dark Bluish Gray Part 32034 Element 32034199 or 6271876 ×2
  • Technic Beam 1 x 11 Thick Dark Bluish Gray Part 32525 Element 4603472 or 4534914 ×3
  • Technic Beam 1 x 15 Thick with Alternating Holes Dark Bluish Gray Part 71710 Element 6396963 ×1
  • Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Dark Bluish Gray Part 60483 Element 6265093 or 6006141 ×1
  • Technic Beam 1 x 4 Thin Dark Bluish Gray Part 32449 Element 6327561 or 4210749 ×4
  • Technic Beam 1 x 7 Thick with Alternating Holes Dark Bluish Gray Part 2391 Element 6432397 ×2
  • Technic Beam 2 x 3 Thick [90° Offset Centre Beam Hole] Dark Bluish Gray Part 3167 Element 6475314 ×1
  • Technic Beam 2 x 4 L-Shape Thick Dark Bluish Gray Part 32140 Element 6271830 or 4210667 ×6
  • Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] Dark Bluish Gray Part 14720 Element 6396959 ×1
  • Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge] Dark Bluish Gray Part 65487 Element 6282144 ×4
  • Technic Pin Connector Hub with 2 Axles Dark Bluish Gray Part 27940 Element 6167281 ×3
  • Technic Worm Gear Short Dark Bluish Gray Part 27938 Element 6170153 ×1

Light Bluish Gray 26 pieces

  • Hinge Cylinder 1 x 2 Locking with 1 Finger and Axle Hole On Ends [No Side Slots] Light Bluish Gray Part 53923 Element 6265704 ×2
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×4
  • Technic Axle 7 Light Bluish Gray Part 44294 Element 44294194 or 4211805 ×1
  • Technic Axle Towball Light Bluish Gray Part 2736 Element 6443149 or 4211375 ×2
  • Technic Axle and Pin Connector Angled #2 - 180° Light Bluish Gray Part 32034 Element 6346487 or 4211567 ×3
  • Technic Axle and Pin Connector Perpendicular Light Bluish Gray Part 6536 Element 6261375 or 4211775 ×3
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Light Bluish Gray Part 32184 Element 6276969 or 4211621 ×2
  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 1 spare in the box ×3
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 1 spare in the box ×1
  • Technic Pin Long 3l with Stop and Hole Light Bluish Gray Part 77765 Element 6338962 ×1
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 1 spare in the box ×2
  • Technic Universal Joint 3L [Complete Assembly] Light Bluish Gray Part 61903 Element 6335279 or 6321309 ×1
  • Wheel 11 x 8 with Center Groove Light Bluish Gray Part 42610 Element 4211758 ×1

White 21 pieces

  • Brick Round 2 x 2, Pin Holes White Part 17485 Element 6218899 ×6
  • Brick Round Curved 1 x 1 x 1 1/3 Quarter Dome White Part 1871 Element 6442360 ×6
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) White Part 4032a Element 6601914 or 403201 ×6
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] White Part 2654 Element 6601843 or 6552259 ×3

Tan 17 pieces

  • Technic Axle 4 with Centre Stop Tan Part 99008 Element 4666999 ×2
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×8
  • Technic Gear 12 Tooth Bevel Tan Part 6589 Element 4565452 or 4514556 ×2
  • Technic Pin 3/4 Tan Part 32002 Element 6663097 or 6013938 1 spare in the box ×2
  • Technic Pin Long without Friction Ridges, with Anti-Roll Notch Tan Part 39888 Element 6321305 ×3

Sand Blue 14 pieces

  • Technic Beam 2 x 3 L-Shape with Quarter Ellipse Thick Sand Blue Part 71708 Element 6518364 ×6
  • Technic Panel Car Mudguard Arched 9 x 2 x 3, Arched Top #42 Sand Blue Part 2459 Element 6518375 ×2
  • Technic Panel Fairing #10 Medium Triangle Smooth Sand Blue Part 2403 Element 6518367 ×1
  • Technic Panel Fairing #5 Long Smooth, Side A Sand Blue Part 64681 Element 6518389 ×1
  • Technic Panel Fairing #6 Long Smooth, Side B Sand Blue Part 64393 Element 6462573 ×1
  • Technic Panel Fairing #9 Medium Triangle Smooth Sand Blue Part 2395 Element 6518366 ×1
  • Technic Panel Round Corner 5 x 3 x 2 Left Sand Blue Part 2438 Element 6518368 ×1
  • Technic Panel Round Corner 5 x 3 x 2 Right Sand Blue Part 2442 Element 6518371 ×1

Trans-Yellow 8 pieces

  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Trans-Yellow Part 2654 Element 6581773 or 6171728 ×2
  • Tile Round 1 x 1 Trans-Yellow Part 98138 Element 6514193 or 6274740 1 spare in the box ×6

Reddish Brown 6 pieces

  • Technic Axle 3 with Stop Reddish Brown Part 24316 Element 6135494 ×2
  • Technic Axle 5 with Stop Reddish Brown Part 15462 Element 6159763 ×4

Flat Silver 3 pieces

  • Propeller 7 Blade 6 Diameter Flat Silver Part 87751 Element 6493590 or 6176468 ×3

Dark Orange 2 pieces

  • Technic Disc 3 x 3 Dark Orange Part 2723 Element 6404642 ×2

Medium Nougat 2 pieces

  • Brick Round 2 x 2 with Axle Hole Medium Nougat Part 3941 Element 6454167 ×1
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Medium Nougat Part 4032a Element 6167643 ×1

Dark Azure 1 piece

  • Technic Gear 20 Tooth with Axle Hole [+ Opening] Dark Azure Part 69779 Element 6396480 ×1

Dark Tan 1 piece

  • Technic Axle 3 with Stud Dark Tan Part 6587 Element 6031821 or 6013821 ×1

Reddish Orange 1 piece

  • Technic Panel Curved and Bent 6 x 3 Reddish Orange Part 24116 Element 6476621 ×1

Trans-Clear 1 piece

  • Windscreen 8 x 8 x 3 Dome with Dual 2 Fingers - 7 Teeth Trans-Clear Part 69320 Element 6514330 or 6336740 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 42201-1 [No Color/Any Color] Part 10110645 Element 6522697 ×1

Tick each piece as you find it, or mark it missing.

When a piece really is missing

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