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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.

Fiber Optic Multi Set / Multi Racer Set (with Fibre Optics)

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8456 Fiber Optic Multi Set / Multi Racer Set (with Fibre Optics)

406 pieces in 107 part and color combinations.

LEGO counts 404 pieces. This inventory comes from a separate parts catalog and lists 406; 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 198 pieces

  • Arm Piece with Pin, 2 Fingers Black Part 6048a Element 604826 ×2
  • Arm Piece with Pin, 3 Fingers Black Part 6217 Element 4107590 or 4101774 ×2
  • Battery Box, 9V Small [Complete Assembly] Black Part 4760c01 Element 4109849 ×1
  • Brick Sloped 33° 3 x 1 Black Part 4286 Element 428626 ×2
  • Brick Sloped Inverted 34° 3 x 1 without Internal Stopper Black Part 4287a ×4
  • Brick Sloped Inverted 45° 2 x 1 Black Part 3665 Element 366526 ×4
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Black Part 3660 Element 366026 ×1
  • Brick Sloped Inverted 45° 3 x 1 Double with 2 Completely Open Studs Black Part 2341 Element 234126 ×2
  • Hinge Plate 1 x 4 Swivel Top / Base - Solid Clip [Complete Assembly] Black Part 73983 Element 6102782 or 74011 ×8
  • Plate 1 x 1 Black Part 3024 Element 302426 ×4
  • Plate 1 x 10 Black Part 4477 Element 447726 ×2
  • Plate 1 x 2 Black Part 3023 Element 302326 ×12
  • Plate 1 x 4 Black Part 3710 Element 371026 ×2
  • Plate 1 x 6 Black Part 3666 Element 366626 ×4
  • Plate 1 x 8 Black Part 3460 Element 346026 ×2
  • Plate 2 x 10 Black Part 3832 Element 383226 ×2
  • Plate 2 x 16 Black Part 4282 Element 428276 or 428226 ×2
  • Plate 2 x 2 Black Part 3022 Element 302226 ×1
  • Plate 2 x 2 Corner Black Part 2420 Element 242026 ×6
  • Plate 2 x 3 Black Part 3021 Element 302126 ×3
  • Plate 2 x 8 Black Part 3034 Element 303426 ×2
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Black Part 2654 Element 4617551 or 4278359 ×3
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Black Part 3794a ×2
  • Plate Special 2 x 2 with 1 Pin Hole [Split Underside Ribs] Black Part 2444 Element 244426 ×1
  • Propeller 3 Blade 3 Diameter with Axle Cross Black Part 6041 Element 604126 ×1
  • Technic Axle 10 Black Part 3737 Element 373726 ×2
  • Technic Axle 12 Black Part 3708 Element 370826 ×2
  • Technic Axle 2 Black Part 3704 Element 370426 ×11
  • Technic Axle 3 Black Part 4519 Element 6238084 or 451926 ×6
  • Technic Axle 4 Black Part 3705 Element 370526 ×3
  • Technic Axle 6 Black Part 3706 Element 370626 ×4
  • Technic Axle 8 Black Part 3707 Element 370726 ×8
  • Technic Beam 1 x 3 Thin Black Part 6632 Element 6331723 or 4107828 ×10
  • Technic Beam 1 x 4 Thin with Stud Connector Black Part 2825 Element 6331570 or 4107136 ×2
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Black Part 6629 Element 6279881 or 4119800 ×3
  • Technic Beam Triangle Thin [Type I] Black Part 2905 Element 4142543 or 290526 ×6
  • Technic Brick 1 x 1 with Pin Hole Black Part 6541 Element 654126 ×2
  • Technic Brick 1 x 10 [9 Pin Holes] Black Part 2730 Element 273026 ×2
  • Technic Brick 1 x 12 [11 Pin Holes] Black Part 3895 Element 389526 ×2
  • Technic Brick 1 x 16 [15 Pin Holes] Black Part 3703 Element 370326 ×5
  • Technic Brick 1 x 2 [1 Pin Hole] Black Part 3700 Element 370026 ×5
  • Technic Brick 1 x 4 [3 Pin Holes] Black Part 3701 Element 370126 ×4
  • Technic Brick 1 x 6 [5 Pin Holes] Black Part 3894 Element 389426 ×3
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Black Part 6558 Element 655826 ×3
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×17
  • Technic Plate 1 x 5 with Toothed Ends, 2 Studs and Center Axle Hole Black Part 2711 Element 4279391 or 4195722 ×3
  • Technic Plate 2 x 4 [3 Holes] Black Part 3709 Element 370926 ×2
  • Technic Slope Long 1 x 6 with 3 Pin Holes Black Part 2744 Element 6311889 or 274426 ×4
  • Technic Slope Short (Wing Front) Black Part 2743 Element 6143851 or 4227262 ×2
  • Technic Wedge Belt Wheel Tire Black Part 2815 Element 6028041 or 281526 ×2
  • Technic Worm Gear Black Part 4716 Element 6037533 or 471626 ×1
  • Tile 1 x 4 with Groove Black Part 2431 Element 243126 ×2
  • Tyre 49.6 x 28 VR Black Part 6594 Element 75778 ×2
  • Wedge Plate 3 x 3 Cut Corner Black Part 2450 Element 4227684 or 245026 ×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
  • Wire with Brick 2 x 2 x 2/3 Pair, 20L Black Part 5306bc020 Element 4100355 ×1

Light Gray 159 pieces

  • Brick Sloped 45° 2 x 2 with Flight Control Print Light Gray Part 3039pr9969 Element 81871 ×1
  • Gearbox 4 x 4 x 1 2/3 with 1 x 2 Cutouts, Pin Holes Light Gray Part 6585 Element 658502 ×1
  • Hub, Fiber Optics Element Light Gray Part 6637 Element 75815 ×1
  • Plate 1 x 2 Light Gray Part 3023 Element 302302 ×4
  • Plate 1 x 3 Light Gray Part 3623 Element 362302 ×2
  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×3
  • Plate Special 2 x 2 with 1 Pin Hole [Split Underside Ribs] Light Gray Part 2444 Element 244402 ×2
  • Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle) Light Gray Part 6553 Element 655302 ×4
  • Technic Axle Connector Ridged [with x Hole x Orientation] Light Gray Part 6538b Element 4113804 or 4100408 ×2
  • Technic Axle Pin without Friction Ridges Lengthwise Light Gray Part 3749 Element 4184168 or 4154179 1 spare in the box ×18
  • Technic Axle and Pin Connector Light Gray Part 3651 Element 4105243 or 365102 ×2
  • Technic Axle and Pin Connector Perpendicular Light Gray Part 6536 Element 4173667 or 653602 ×18
  • Technic Axle and Pin Connector Toggle Joint Toothed [with Slots] Light Gray Part 4273b Element 427302 ×8
  • Technic Beam 1 x 3 Thin Light Gray Part 6632 Element 4107825 ×2
  • Technic Brick 1 x 1 with Pin Hole Light Gray Part 6541 Element 654102 ×4
  • Technic Brick 1 x 2 [1 Pin Hole] Light Gray Part 3700 Element 370002 ×2
  • Technic Brick 1 x 4 [3 Pin Holes] Light Gray Part 3701 Element 370102 ×2
  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 ×13
  • Technic Bush 1/2 Toothed Type II [X Opening] Light Gray Part 4265b Element 4100501 or 657702 ×21
  • Technic Cam Light Gray Part 6575 Element 657502 ×2
  • Technic Engine Connecting Rod Light Gray Part 2852 Element 285202 ×4
  • Technic Engine Crankshaft Light Gray Part 2853 Element 4119475 or 285302 ×2
  • Technic Engine Crankshaft Center Light Gray Part 2854 Element 285402 ×1
  • Technic Engine Cylinder with Side Slots Light Gray Part 2850a ×4
  • Technic Gear 12 Tooth Bevel Light Gray Part 6589 Element 658902 ×4
  • Technic Gear 24 Tooth Crown with Reinforcements [New Style] Light Gray Part 3650c Element 365002 ×1
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 1 spare in the box ×4
  • Technic Pin 1/2 without Friction Ridges Light Gray Part 4274 Element 427402 ×22
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×1
  • Technic Plate 1 x 4 with Toothed Ends Light Gray Part 4263 Element 4225508 or 4189319 ×2
  • Technic Plate 2 x 6 [5 Holes] Light Gray Part 32001 Element 3200102 ×1
  • Technic Wedge Belt Wheel [aka Pulley] Light Gray Part 4185 Element 4100502 or 418502 ×1

Green 23 pieces

  • Hinge Plate 1 x 4 Swivel Top / Base - Solid Clip [Complete Assembly] Green Part 73983 Element 6102767 or 4187931 ×6
  • Plate 1 x 2 Green Part 3023 Element 302328 ×4
  • Plate 1 x 4 Green Part 3710 Element 371028 ×4
  • Plate 1 x 6 Green Part 3666 Element 366628 ×2
  • Plate 1 x 8 Green Part 3460 Element 346028 ×2
  • Plate 2 x 3 Green Part 3021 Element 302128 ×2
  • Plate 2 x 6 Green Part 3795 Element 379528 ×1
  • Wedge Plate 3 x 3 Cut Corner Green Part 2450 Element 6529282 or 6114672 ×2

Dark Gray 10 pieces

  • Hose Rigid 3mm D. 12L / 9.6cm Dark Gray Part 75c12 Element 4186483 or 4118611 ×2
  • Technic Axle 3 with Stud Dark Gray Part 6587 Element 4113884 or 658727 ×2
  • Technic Engine Piston Round Dark Gray Part 2851 Element 4160859 or 285127 ×4
  • Technic Pin 3/4 Dark Gray Part 32002 Element 4109854 ×2

Trans-Clear 8 pieces

  • Cable, Fiber Optics Trans-Clear Part 6640 Element 4109999 or 664040 ×8

Yellow 8 pieces

  • Technic Seat / Chair [3 x 2 Base] Yellow Part 2717 Element 4251459 or 271724 ×1
  • Technic Wedge Belt Wheel [aka Pulley] Yellow Part 4185 Element 6636439 or 6363273 ×2
  • Tile Special 1 x 2 Grille with Bottom Groove Yellow Part 2412b Element 241224 ×2
  • Wheel 30 x 13 Model Team Yellow Part 2695 Element 4212501 or 269524 ×1
  • Wheel 49.6 x 28 VR (36.8 x 26) with Axle Hole Yellow Part 6595 Element 4496710 or 4199342 ×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

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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