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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.

Mobile Command Center

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4746 Mobile Command Center

406 pieces in 134 part and color combinations, plus 5 minifigures.

LEGO counts 420 pieces. This inventory comes from a separate parts catalog and lists 425, including the 19 parts inside the minifigures; 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

Black 132 pieces

  • Aircraft Fuselage Curved 10 x 4 x 2 Black Part 47846 Element 4221240 ×1
  • Bar 6.6L with Stop Ring [Umbrella Stand] Black Part 4095 Element 409526 ×2
  • Brick 1 x 10 Black Part 6111 Element 611126 ×2
  • Brick 1 x 2 Black Part 3004 Element 300426 ×2
  • Brick 1 x 4 Black Part 3010 Element 301026 ×2
  • Brick 1 x 6 Black Part 3009 Element 300926 ×2
  • Brick 2 x 10 Black Part 3006 Element 4617860 or 300626 ×2
  • Brick 2 x 2 Corner Black Part 2357 Element 235776 or 235726 ×2
  • Brick 2 x 4 Black Part 3001 Element 300126 ×3
  • Brick 2 x 6 Black Part 2456 Element 4181144 or 245626 ×2
  • Brick Curved 6 x 1 Black Part 42022 Element 4160393 ×2
  • Brick Sloped 33° 3 x 2 Black Part 3298 Element 329826 ×1
  • Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×4
  • Brick Sloped 75° 2 x 2 x 3 [Hollow Studs] Black Part 3684 Element 4286874 or 4248065 ×1
  • Brick Sloped Inverted 34° 3 x 1 with Internal Stopper Black Part 4287b ×2
  • Brick Sloped Inverted 45° 2 x 2 Double Convex Black Part 3676 Element 6403373 or 6123840 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Black Part 3660 Element 366026 ×5
  • Brick Sloped Inverted 75° 2 x 1 x 3 Black Part 2449 Element 4636202 or 4561789 ×6
  • Brick Special 1 x 2 Palisade [aka Log] Black Part 30136 Element 4644456 or 4519980 ×4
  • Equipment Magnifying Glass with Thin Frame and Hollow Handle with Trans-Red Lens Pattern Black Part 30152pat0003 Element 4223362 ×1
  • Handlebars Black Part 30031 Element 3003126 ×2
  • Hinge Cylinder 1 x 3 Locking with 1 Finger and Technic Friction Pin with Round Hole Black Part 41532 Element 4159335 ×1
  • Hinge Plate 1 x 2 Locking with 1 Finger On End, with Groove Black Part 44301a Element 4183043 ×4
  • Hinge Plate 1 x 8 Locking with Angled Side Extensions, Rounded Plate Underside, 9 Teeth Black Part 30407 Element 4192456 ×4
  • Launcher, Technic Competition Cannon, Round Bottom with Same Color Ends Black Part 32074c01 Element 4118816 or 4118815 ×1
  • Panel 1 x 4 x 1 with Rounded Corners [Thick Wall] Black Part 43337 Element 4239147 or 4233256 ×2
  • Plate 1 x 4 Black Part 3710 Element 371026 ×6
  • Plate 2 x 6 Black Part 3795 Element 379526 ×6
  • Plate 8 x 8 Black Part 41539 Element 4166619 ×2
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Black Part 42003 Element 6273708 or 4200326 ×2
  • Technic Brick 1 x 1 with Pin Hole Black Part 6541 Element 654126 ×2
  • Technic Brick 1 x 14 [13 Pin Holes] Black Part 32018 Element 4107558 ×4
  • Technic Brick 1 x 2 [2 Pin Holes] Black Part 32000 Element 3200026 ×4
  • Technic Brick 4 x 6 with 2 x 4 Opening Black Part 32531 Element 6456527 or 4162508 ×2
  • Technic Brick 6 x 8 with 4 x 6 Opening Black Part 32532 Element 6448394 or 4188143 ×1
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Black Part 6558 Element 655826 ×12
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×12
  • Technic Pin with Friction Ridges Lengthwise and Towball Black Part 6628 Element 4184169 or 662826 ×6
  • Technic Plate 2 x 8 [7 Holes] Black Part 3738 Element 373826 ×1
  • Tile 1 x 2 with Alpha Team Green Screen and Controls Print Black Part 3069bpr0075 Element 4225430 ×2
  • Tile 1 x 2 with Avionics Copper, Red & Silver Controls Print Black Part 3069bpr0070 Element 6021512 or 4162982 ×1
  • Tile 1 x 8 with Groove Black Part 4162 Element 416226 ×2
  • Weapon Axe Black Part 3835 Element 383526 ×1
  • Wheel Hard Plastic Spoked Black Part 30324 Element 4173267 or 4121697 ×4

White 73 pieces

  • Brick Curved 6 x 2 White Part 44126 Element 6619299 or 4179870 ×2
  • Brick Sloped 45° 2 x 1 with Bottom Pin White Part 3040b Element 6552115 or 4121932 ×2
  • Brick Sloped 45° 2 x 2 White Part 3039 Element 6552103 or 303901 ×4
  • Minifig Head (No Face), Alpha Team Arctic Red, Blue, Yellow Ogel Orb Print [Blocked Open Stud] White Part 3626bpr0094 Element 4225962 ×2
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×13
  • Plate 2 x 2 Corner White Part 2420 Element 6548254 or 242051 ×2
  • Plate 2 x 3 White Part 3021 Element 6550136 or 302101 ×4
  • Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×2
  • Plate 2 x 6 White Part 3795 Element 6550146 or 379501 ×2
  • Plate 4 x 12 White Part 3029 Element 4168072 or 302901 ×2
  • Plate 4 x 8 White Part 3035 Element 6609533 or 303501 ×1
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) White Part 4032a Element 6601914 or 403201 ×1
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) White Part 3794a ×3
  • Technic Axle and Pin Connector Perpendicular White Part 6536 Element 6261372 or 4173670 ×13
  • Technic Beam 1 x 3 Thick White Part 32523 Element 6632140 or 4208160 ×1
  • Tile 1 x 4 with Groove White Part 2431 Element 6548255 or 243101 ×5
  • Tile Special 1 x 1 with Clip and Straight Tips White Part 2555 Element 255501 ×13
  • Turntable 4 x 4 Square Base with Top, Complete Assembly White Part 3403c01 Element 4221666 or 4143679 ×1

Light Bluish Gray 46 pieces

  • Brick Round 1 x 1 Open Stud Light Bluish Gray Part 3062b Element 4211412 ×2
  • Brick Sloped 33° 3 x 1 Light Bluish Gray Part 4286 Element 4211488 ×2
  • Brick Sloped 45° 2 x 1 with Bottom pin, with Green and Red Buttons and Keypad Print Light Bluish Gray Part 3040bpr0003 Element 4228198 ×2
  • Brick Special 1 x 1 with Handle Light Bluish Gray Part 2921 Element 6170569 or 4225532 ×2
  • Brick Special 1 x 2 with Vertical Clip [Thick U Clip] Light Bluish Gray Part 30237a Element 4211598 ×2
  • Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 9 Teeth Light Bluish Gray Part 30553 Element 4222047 ×1
  • Hinge Plate 1 x 2 Locking with 2 Fingers On End, with Groove, 9 Teeth Light Bluish Gray Part 44302a Element 4211804 ×4
  • Hinge Tile 1 x 4 Locking Dual 1 Fingers on Top [4 Locking Ridges] Light Bluish Gray Part 44822 Element 4193106 ×1
  • Plate 1 x 3 Light Bluish Gray Part 3623 Element 4211429 or 3623194 ×2
  • Plate 1 x 8 Light Bluish Gray Part 3460 Element 4211425 ×1
  • Plate 2 x 8 Light Bluish Gray Part 3034 Element 4211406 ×2
  • Plate Special 1 x 1 with Clip Vertical [Thick U Clip] Light Bluish Gray Part 4085c Element 4211479 ×4
  • Plate Special 2 x 2 with 1 Pin Hole [Split Underside Ribs] Light Bluish Gray Part 2444 Element 4211359 or 2444194 ×3
  • Projectile, Technic Competition Arrow, Beam Shaft with Solid Black Rubber End Light Bluish Gray Part 76110c01 Element 4225060 ×1
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×3
  • Technic Axle 7 Light Bluish Gray Part 44294 Element 44294194 or 4211805 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Light Bluish Gray Part 3700 Element 4211440 ×1
  • Technic Brick 1 x 4 [3 Pin Holes] Light Bluish Gray Part 3701 Element 4211441 ×4
  • Technic Bush 1/2 Smooth with Axle Hole Reduced Light Bluish Gray Part 32123a 1 spare in the box ×2
  • Technic Pin Long without Friction Ridges - Single Slot Light Bluish Gray Part 32556a Element 4211709 ×4
  • Tile 1 x 2 with Stylised Computer Console Print Light Bluish Gray Part 3069bpr0086 Element 4212363 ×1

Sand Blue 41 pieces

  • Brick 1 x 4 Sand Blue Part 3010 Element 4620993 or 4187074 ×1
  • Brick 1 x 6 Sand Blue Part 3009 Element 4620992 or 4216936 ×4
  • Brick Sloped Inverted 34° 3 x 1 with Internal Stopper Sand Blue Part 4287b Element 4182478 ×2
  • Brick Sloped Inverted 45° 2 x 1 Sand Blue Part 3665 Element 6212052 or 4153279 ×6
  • Brick Special 1 x 2 with Grille Sand Blue Part 2877 Element 6177135 or 4183693 ×12
  • Brick Wedged, Curved 12 x 3 Left with Alpha Team Arctic Wraparound Print Sand Blue Part 42061pr0007 Element 4224280 ×2
  • Brick Wedged, Curved 12 x 3 Right with Alpha Team Arctic Wraparound Print Sand Blue Part 42060pr0007 Element 4224278 ×2
  • Plate 2 x 3 Sand Blue Part 3021 Element 6353800 or 4153276 ×1
  • Plate 2 x 4 Sand Blue Part 3020 Element 6248957 or 6052827 ×1
  • Plate 2 x 6 Sand Blue Part 3795 Element 6550568 or 4153430 ×1
  • Plate 4 x 4 Sand Blue Part 3031 Element 6413293 or 4243841 ×2
  • Tile 1 x 2 with Groove Sand Blue Part 3069b Element 6142505 or 4170251 ×4
  • Tile Special 1 x 2 with Handle Sand Blue Part 2432 Element 4222961 ×2
  • Windscreen 10 x 4 x 2 Curved with Bubble Cutout and Single Hinge Finger Sand Blue Part 47843 Element 4254938 ×1

Blue 31 pieces

  • Brick Special 1 x 2 with Pin Blue Part 2458 Element 245823 ×4
  • Plate Special 1 x 1 with Clip Horizontal [Thick U Clip] Blue Part 6019 Element 601973 or 601923 ×1
  • Technic Axle Connector Ridged [with x Hole x Orientation] Blue Part 6538b Element 4113807 or 4107802 ×2
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×16
  • Technic Axle and Pin Connector Angled #1 Blue Part 32013 Element 6332570 or 4107797 ×2
  • Technic Rubber Belt Medium [26mm ID] [Round Cross Section] Blue Part 85545 Element 6049730 or 4544147 ×2
  • Technic Tooth 1 x 3 with Axle Hole [Rounded Underside] Blue Part 41669 Element 4185662 ×4

Trans-Orange 27 pieces

  • Antenna 8H Whip Trans-Orange Part 2569 Element 6288215 or 6262202 ×2
  • Cone 1 x 1 [No Top Groove] Trans-Orange Part 4589 Element 4221195 ×1
  • Plate Round 1 x 1 with Solid Stud Trans-Orange Part 6141 Element 6514059 or 6240227 1 spare in the box ×24

Dark Bluish Gray 14 pieces

  • Brick Sloped 65° 2 x 2 x 2 with Bottom Tube Dark Bluish Gray Part 3678b Element 4234534 or 4210760 ×1
  • Equipment Binoculars Dark Bluish Gray Part 30162 Element 4587887 or 4211051 ×1
  • Equipment Radio [Extended Handle, Compact Speaker Grille] Dark Bluish Gray Part 3962b Element 4211116 ×1
  • Hinge Brick 1 x 2 Base Dark Bluish Gray Part 3937 Element 4211066 ×4
  • Plate 2 x 2 Dark Bluish Gray Part 3022 Element 4211094 ×4
  • Tile 2 x 2 with Alpha Team Arctic Blue Rectangle Grid Display Print Dark Bluish Gray Part 3068bpr0108 Element 4514441 or 4225456 ×2
  • Tool Ice Axe [6-Rib Handle] Dark Bluish Gray Part 30193 Element 4567879 or 4514346 1 spare in the box ×1

Dark Blue 12 pieces

  • Brick Sloped 33° 3 x 4 Dark Blue Part 3297 Element 6036241 or 4226907 ×2
  • Brick Sloped 33° 3 x 6 Dark Blue Part 3939 Element 4226913 ×2
  • Brick Wedged, Curved 12 x 3 Left Dark Blue Part 42061 Element 6074662 or 4177397 ×1
  • Brick Wedged, Curved 12 x 3 Right Dark Blue Part 42060 Element 6074661 or 4177388 ×1
  • Brick Wedged, Curved 4 x 4 No Top Studs Dark Blue Part 47753 Element 6289824 or 6115178 ×2
  • Brick Wedged, Curved 8 x 3 x 2 Open Left Dark Blue Part 41750 Element 6392163 or 6074660 ×1
  • Brick Wedged, Curved 8 x 3 x 2 Open Right Dark Blue Part 41749 Element 6392164 or 6074665 ×1
  • Technic Brick 1 x 12 [11 Pin Holes] Dark Blue Part 3895 Element 6482971 or 4227700 ×2

Tan 12 pieces

  • Brick Special 1 x 4 with 4 Studs on One Side Tan Part 30414 Element 4201062 or 4177990 ×4
  • Hinge Brick 2 x 2 Top Plate Thin Tan Part 6134 Element 6487881 or 4519900 ×4
  • Plate Special 1 x 2 [Side Handle Closed Ends] Tan Part 48336 Element 4217562 ×4

Trans-Red 7 pieces

  • Hinge Panel 2 x 4 x 3 1/3 Locking Dual 2 Fingers Trans-Red Part 44572 Element 4508663 or 4226965 ×1
  • Tile 1 x 1 with Groove Trans-Red Part 3070b Element 6581817 or 6254248 ×6

Trans-Medium Blue 4 pieces

  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Trans-Medium Blue Part 2654 Element 6001231 or 4278407 ×2
  • Rock Panel 2 x 4 x 6 with Marbled White Streak Trans-Medium Blue Part 47847pat0001 Element 4215882 ×2

Trans-Clear 3 pieces

  • Equipment Crystal Ball Globe 2 x 2 x 2 Trans-Clear Part 30106 Element 6507889 or 6274736 ×2
  • Windscreen 9 x 3 x 1 2/3 Bubble Canopy with Red Circle and Verniers Print Trans-Clear Part 47844pr0003 Element 4224282 ×1

Trans-Dark Blue 2 pieces

  • Plate Round 1 x 1 with Solid Stud Trans-Dark Blue Part 6141 Element 6514055 or 6240214 1 spare in the box ×2

Yellow 1 piece

  • Tile Special 1 x 2 Grille with Bottom Groove Yellow Part 2412b Element 241224 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 4746-1 [No Color/Any Color] Part 50192 Element 4226574 ×1

Minifigures 5 figures

  • Ogel Minion with Bubble Helmet Minifigure, checked as a whole figure ×1
  • Arrow (Alpha Team) Minifigure, checked as a whole figure ×1
  • Android (Alpha Team) Minifigure, checked as a whole figure ×1
  • Charge Minifigure, checked as a whole figure ×1
  • Radia (Alpha Team) 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.

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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.