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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.

Robo Master

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2154 Robo Master

351 pieces in 115 part and color combinations, plus 2 minifigures.

The piece count includes the 12 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

Bricks 45 pieces

  • Brick 1 x 12 Black Part 6112 Element 611226 ×2
  • Brick 1 x 3 Black Part 3622 Element 362226 ×4
  • Brick 1 x 4 Black Part 3010 Element 301026 ×3
  • Brick 1 x 8 Black Part 3008 Element 300826 ×1
  • Brick 2 x 2 Black Part 3003 Element 4103587 or 300326 ×2
  • Brick 2 x 2 Corner Black Part 2357 Element 235776 or 235726 ×2
  • Brick 2 x 3 Black Part 3002 Element 300226 ×2
  • Brick 2 x 4 Black Part 3001 Element 300126 ×2
  • Brick 2 x 3 Blue Part 3002 Element 300223 ×2
  • Brick 2 x 4 Blue Part 3001 Element 300173 or 300123 ×2
  • Brick 1 x 6 Light Gray Part 3009 Element 300902 ×5
  • Brick 2 x 2 Light Gray Part 3003 Element 4103591 or 300352 ×2
  • Brick 2 x 2 Corner Light Gray Part 2357 Element 235752 or 235702 ×6
  • Brick 2 x 4 Light Gray Part 3001 Element 4116259 or 300102 ×2
  • Brick 2 x 8 Light Gray Part 3007 Element 300702 ×2
  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×6

Bricks Special 42 pieces

  • Brick Special 1 x 2 x 2/3 with Studs on Sides Black Part 4595 Element 6681661 or 4523339 ×4
  • Brick Special 2 x 2 with 2 Pins and Axle Hole Dark Gray Part 30000 Element 3000027 ×6
  • Brick Special 1 x 1 with Headlight Light Gray Part 4070 Element 407002 ×18
  • Brick Special 1 x 2 with Grille Light Gray Part 2877 Element 287702 ×12
  • Brick Special 1 x 2 x 2/3 with Studs on Sides Light Gray Part 4595 Element 459502 ×2

Plates 40 pieces

  • Plate 1 x 2 Black Part 3023 Element 302326 ×1
  • Plate 1 x 3 Black Part 3623 Element 362326 ×2
  • Plate 1 x 4 Black Part 3710 Element 371026 ×4
  • Plate 2 x 2 Black Part 3022 Element 302226 ×2
  • Plate 2 x 3 Black Part 3021 Element 302126 ×4
  • Plate 2 x 6 Black Part 3795 Element 379526 ×1
  • Plate 2 x 8 Black Part 3034 Element 303426 ×2
  • Plate 4 x 6 Black Part 3032 Element 303226 ×1
  • Plate 4 x 8 Black Part 3035 Element 303526 ×1
  • Plate 2 x 12 Blue Part 2445 Element 244523 ×1
  • Plate 2 x 2 Blue Part 3022 Element 4613973 or 302223 ×2
  • Plate 2 x 2 Corner Blue Part 2420 Element 242073 or 242023 ×4
  • Plate 2 x 4 Blue Part 3020 Element 4240375 or 302023 ×1
  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×2
  • Plate 2 x 10 Light Gray Part 3832 Element 383202 ×1
  • Plate 2 x 4 Light Gray Part 3020 Element 302002 ×3
  • Plate 2 x 6 Light Gray Part 3795 Element 379502 ×1
  • Plate 2 x 8 Light Gray Part 3034 Element 303402 ×4
  • Plate 4 x 12 Light Gray Part 3029 Element 302902 ×1
  • Plate 1 x 2 Red Part 3023 Element 302321 ×1
  • Plate 2 x 3 Yellow Part 3021 Element 302124 ×1

Bricks Sloped 38 pieces

  • Brick Sloped 33° 3 x 2 Black Part 3298 Element 329826 ×2
  • Brick Sloped 33° 3 x 2 with RoboForce Gold 'ROBO' and Blue and Yellow Circuitry Print Black Part 3298pr0034 Element 4109742 ×3
  • Brick Sloped 45° 2 x 2 Black Part 3039 Element 303926 ×7
  • Brick Sloped 45° 2 x 2 with RoboForce Gold and Red Display and Circuitry Print Black Part 3039pr9981 ×1
  • Brick Sloped 45° 2 x 3 Black Part 3038 Element 303826 ×2
  • Brick Sloped 75° 2 x 1 x 3 with Open Stud Black Part 4460a ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Black Part 3660 Element 366026 ×4
  • Brick Sloped Inverted 45° 4 x 2 Double with 2 x 2 Recessed Black Part 4871 Element 4188534 or 487126 ×2
  • Brick Sloped Inverted 45° 4 x 4 Double with 4 x 2 Recessed Black Part 4854 Element 4643321 or 4603490 ×1
  • Brick Sloped Inverted 75° 2 x 1 x 3 Black Part 2449 Element 4636202 or 4561789 ×8
  • Brick Sloped 33° 3 x 2 Light Gray Part 3298 Element 329802 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Light Gray Part 3660 Element 366002 ×4

Plates Round Curved and Dishes 30 pieces

  • Dish 2 x 2 Inverted [Radar] Trans-Neon Green Part 4740 Element 6245297 or 4112517 ×8
  • Plate Round 1 x 1 with Solid Stud Trans-Neon Green Part 6141 Element 6240223 or 3005749 ×18
  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 ×4

Plates Special 26 pieces

  • Plate Special 1 x 1 with Clip Horizontal [Thick U Clip] Black Part 6019 Element 601976 or 601926 ×4
  • Plate Special 1 x 2 Side Handle [Free Ends] Black Part 2540 Element 4140588 or 254026 ×10
  • Plate Special 1 x 2 with Handles [Flat Ends / Low Attachment] Black Part 3839b Element 383926 ×5
  • Plate Special 1 x 4 Offset with Bar Holes Black Part 4590 Element 6002559 or 4278029 ×3
  • Plate Special 3 x 2 with Rounded End, Hole Blue Part 3176 Element 317673 or 317623 ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Light Gray Part 3794a Element 379402 ×2

Hinges, Arms and Turntables 21 pieces

  • Hinge Bar 2.5L with 2 and 3 Fingers on Ends (Pantograph Shoe Holder) Black Part 2923 Element 292326 ×3
  • Hinge Brick 1 x 2 Base Black Part 3937 Element 393726 ×2
  • Hinge Plate 1 x 4 Swivel Top / Base - Solid Clip [Complete Assembly] Black Part 73983 Element 6102782 or 74011 ×4
  • Hinge Plate 2 x 5 with Large Hole [Complete Assembly] Black Part 3149bc01 Element 4161112 or 4106943 ×2
  • Hinge Plate 2 x 9 with Hole Close to Hinge [Complete Assembly] Black Part 3324ac01 Element 4187212 or 4106945 ×1
  • Hinge Vehicle Roof 4 x 4 Black Part 4213 Element 421326 ×1
  • Hinge Vehicle Roof Holder 1 x 4 Black Part 4315 Element 4250225 or 431576 ×1
  • Hinge Brick 1 x 2 Top Plate Thin Light Gray Part 3938 Element 393802 ×2
  • Hinge Plate 1 x 2 with 2 Fingers and Hollow Studs Light Gray Part 4276b Element 427602 ×3
  • Hinge Plate 2 x 9 with Hole Close to Hinge [Complete Assembly] Light Gray Part 3324ac01 Element 4106906 ×2

Bricks Round and Cones 19 pieces

  • Brick Round 1 x 1 with Fins, Open Stud Black Part 4588 Element 6039178 or 4246931 ×1
  • Brick Round 2 x 2 with Axle Hole Blue Part 3941 Element 614373 or 614323 ×5
  • Brick Round 1 x 1 Open Stud Light Gray Part 3062b Element 306202 ×12
  • Cone 1 x 1 [No Top Groove] Trans-Neon Green Part 4589 Element 618849 or 458949 ×1

Tiles Special 15 pieces

  • Tile Special 1 x 2 Grille with Bottom Groove Black Part 2412b Element 241226 ×5
  • Tile Special 1 x 2 with Handle Light Gray Part 2432 Element 243202 ×1
  • Tile Special 1 x 2 Grille with Bottom Groove Trans-Neon Green Part 2412b Element 4272661 or 4109766 ×9

Plates Wedged 12 pieces

  • Wedge Plate 3 x 4 without Stud Notches Black Part 4859 ×1
  • Wedge Plate 3 x 6 Cut Corners Black Part 2419 Element 241926 ×1
  • Wedge Plate 4 x 4 Wing Left Black Part 3936 Element 4280156 or 4189084 ×1
  • Wedge Plate 4 x 4 Wing Right Black Part 3935 Element 4280157 or 4189086 ×1
  • Wedge Plate 4 x 9 without Stud Notches Black Part 2413 Element 6002201 or 4286023 ×2
  • Wedge Plate 8 x 4 Wing Left Black Part 3933 Element 4189089 or 393326 ×1
  • Wedge Plate 8 x 4 Wing Right with Stud Notch Black Part 3934 Element 4189090 or 393426 ×1
  • Wedge Plate 4 x 4 Wing Left Light Gray Part 3936 Element 4248128 or 4248125 ×1
  • Wedge Plate 4 x 4 Wing Right Light Gray Part 3935 Element 4248118 or 393502 ×1
  • Wedge Plate 8 x 4 Wing Left Light Gray Part 3933 Element 393302 ×1
  • Wedge Plate 8 x 4 Wing Right with Stud Notch Light Gray Part 3934 Element 393402 ×1

Tiles 12 pieces

  • Tile 1 x 2 with Robo Gold, Yellow, Red Print Black Part 3069bpr0104 Element 4109744 ×3
  • Tile 1 x 4 with Gold, Red and Blue Circuitry Print Black Part 2431pr0046 Element 4109748 ×2
  • Tile 1 x 8 with Groove Black Part 4162 Element 416226 ×2
  • Tile 1 x 4 with Groove Blue Part 2431 Element 243123 ×1
  • Tile 1 x 2 with Digital Clock Print - '12:01' or '10:21' White Part 3069bpr0025 Element 81268 ×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 Simple Computer Keyboard Print White Part 3069bpr0049 Element 4227921 or 81890 ×1
  • Tile 1 x 2 with Telemetry Panel Print White Part 3069bpr0043 Element 81575 ×1

Wheels and Tyres 12 pieces

  • Wheel Hard Plastic Small (22mm D. x 24mm) Black Part 6118 Element 4106928 or 611876 ×12

Panels 11 pieces

  • Panel 3 x 5 Solar / Deltoid with Clip [Hexagonal] Black Part 30034 Element 4107112 ×4
  • Panel 3 x 2 x 6 Trans-Neon Green Part 2466 Element 4109867 or 246649 ×5
  • Panel 3 x 3 x 6 Corner Convex Trans-Neon Green Part 2468 Element 4109699 ×2

Bars, Ladders and Fences 9 pieces

  • Antenna 1 x 4 with Rounded Top Black Part 3957a ×3
  • Lever Small Base with Light Gray Lever Black Part 298c03 Element 73667 ×4
  • Antenna 8H Whip Trans-Neon Green Part 2569 Element 6265159 or 6164380 ×2

Technic Bricks 6 pieces

  • Technic Slope Long 1 x 6 with 3 Pin Holes Black Part 2744 Element 6311889 or 274426 ×6

Bricks Wedged 5 pieces

  • Brick Wedged 3 x 4 [No Stud Notches] Black Part 2399 Element 4189285 or 239926 ×1
  • Brick Wedged 3 x 4 [No Stud Notches] Light Gray Part 2399 Element 4109697 or 239902 ×3
  • Brick Wedged, Sloped Inverted 6 x 4 with 2 Stud Connections Light Gray Part 4856a Element 4143128 or 4109698 ×1

Tubes and Hoses 4 pieces

  • Flexible Hose 8.5L with Tabbed Ends (Ends same color as Tube) Light Gray Part 73590c02a Element 621132 ×4

Bricks Curved 1 piece

  • Brick Arch 1 x 6 x 2 - Thick Top with Reinforced Underside Black Part 3307 Element 330726 ×1

Minifig Accessories 1 piece

  • Equipment Control Panel Light Gray Part 2342 Element 4109700 ×1

Stickers 1 piece

  • Sticker Sheet for Sets 2154-1, 5129-1, 5384-1, 6856-1, 6900-1, 6915-1, 6958-1, 6975-1, 6982-1, 6999-1 [No Color/Any Color] Part 170909 Element 170909 ×1

Windscreens and Fuselage 1 piece

  • Windscreen 6 x 4 x 1 1/3 with Hollow Studs Trans-Neon Green Part 6152a Element 4109731 ×1

Minifigures 2 figures

  • RoboForce, Yellow Minifigure, checked as a whole figure ×2

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

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