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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.

Checking

42083 Bugatti Chiron

3,599 pieces in 309 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.

Every bag and the box. Shake out each bag, check its corners and seams, and look inside the empty box.
Inside what you have built. Small pieces lodge inside tubes, under plates and between studs. Turn the model over and look.
The last few steps. Compare each recent step with its parts callout. A piece used in the wrong place earlier leaves you one short later.
Look-alike colors. 21 parts in this set come in two colors that are easy to mix up; they are listed below.
The spare pieces. Many sets include a few extra small pieces. Check them before you order a replacement.
The floor and your building area. Check under furniture, the chair and the edges of your building surface.

Look-alike colors in this set

These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.

Plate 1 x 1 White ×2 Trans-Clear ×8 Trans-Clear is see-through: hold the piece up to a light.
Brick Wedged, Curved 2 x 1 with Stud Notch Left Black ×1 Dark Blue ×3 Black is yellower and darker than Dark Blue.
Brick Wedged, Curved 2 x 1 with Stud Notch Right Black ×1 Dark Blue ×3 Black is yellower and darker than Dark Blue.
Plate 1 x 4 Black ×1 Dark Blue ×2 Black is yellower and darker than Dark Blue.
Technic Beam 1 x 11 Thick Black ×22 Dark Blue ×20 Black is yellower and darker than Dark Blue.
Technic Beam 1 x 15 Thick Black ×30 Dark Blue ×10 Black is yellower and darker than Dark Blue.

17 more look-alike pairs

Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Black ×46 Dark Blue ×22 Black is yellower and darker than Dark Blue.
Technic Beam 1 x 7 Thick Black ×34 Dark Blue ×10 Black is yellower and darker than Dark Blue.
Technic Beam 1 x 9 Bent (6 - 4) Thick Black ×16 Dark Blue ×6 Black is yellower and darker than Dark Blue.
Technic Beam 2 x 4 L-Shape Thick Black ×35 Dark Blue ×6 Black is yellower and darker than Dark Blue.
Technic Panel 3 x 11 x 1 Black ×7 Dark Blue ×4 Black is yellower and darker than Dark Blue.
Technic Panel Curved 3 x 13 Black ×1 Dark Blue ×6 Black is yellower and darker than Dark Blue.
Technic Panel Fairing #1 Small Smooth Short, Side A Black ×1 Dark Blue ×1 Black is yellower and darker than Dark Blue.
Technic Panel Fairing #13 Large Short Smooth, Side A Black ×2 Dark Blue ×2 Black is yellower and darker than Dark Blue.
Technic Panel Fairing #14 Large Short Smooth, Side B Black ×2 Dark Blue ×2 Black is yellower and darker than Dark Blue.
Technic Panel Fairing #2 Small Smooth Short, Side B Black ×1 Dark Blue ×1 Black is yellower and darker than Dark Blue.
Technic Panel Fairing #21 5L Small Smooth, Side B Black ×8 Dark Blue ×6 Black is yellower and darker than Dark Blue.
Technic Panel Fairing #22 5L Small Smooth, Side A Black ×8 Dark Blue ×6 Black is yellower and darker than Dark Blue.
Tile 1 x 2 with Groove Black ×1 Dark Blue ×2 Black is yellower and darker than Dark Blue.
Brick Curved 4 x 1 Double, No Studs Black ×1 Dark Bluish Gray ×4 Black is darker than Dark Bluish Gray.
Brick Wedged, Curved 2 x 1 with Stud Notch Left Black ×1 Dark Bluish Gray ×4 Black is darker than Dark Bluish Gray.
Brick Wedged, Curved 2 x 1 with Stud Notch Right Black ×1 Dark Bluish Gray ×4 Black is darker than Dark Bluish Gray.
Plate 2 x 4 Black ×4 Dark Bluish Gray ×1 Black is darker than Dark Bluish Gray.

Piece checklist

Tiles Special 56 pieces

Tile Special 1 x 2 Grille with Bottom Groove Black Part 2412b Element 241226 ×40
Tile Special Round 1 x 1 with Hollow Bar Black Part 20482 Element 6186675 or 6167933 ×8
Tile Special 1 x 2 Grille with Bottom Groove Flat Silver Part 2412b Element 4619636 ×6
Tile Special 1 x 1 with Clip with Rounded Edges Light Bluish Gray Part 15712 Element 6308012 or 6071229 ×2

Technic Bushes 40 pieces

Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 ×22
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 ×18

Technic Beams Special 29 pieces

Technic Beam 3 x 0.5 Liftarm with Boss and Blocked, Squared Pin Hole Black Part 61408 Element 6313520 ×6
Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick Black Part 64179 Element 6016154 ×16
Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] Light Bluish Gray Part 14720 Element 6055519 ×6
Technic Beam 5 x 11 with 3 x 5 Opening Frame Thick Light Bluish Gray Part 64178 Element 4540797 ×1

Plates Special 23 pieces

Bracket 1 x 2 - 2 x 2 Inverted Black Part 99207 Element 6000650 ×2
Plate Special 1 x 1 with Clip Vertical [Thick Open O Clip] Black Part 60897 Element 6330189 or 4617547 ×4
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Black Part 15573 Element 6092585 ×3
Plate Special 1 x 2 with Pin Hole Underneath Black Part 18677 Element 6192309 or 6167497 ×2
Plate Special 2 x 2 x 2/3 with Two Studs On Side and Two Raised [Solid Anti-stud] Black Part 99206 Element 6052126 ×1
Plate Special 4 x 4 with 2 x 2 Opening Black Part 64799 Element 6058118 ×1
Plate Special 1 x 2 Side Handle [Free Ends] Dark Bluish Gray Part 2540 Element 4210660 ×4
Plate Special 1 x 2 with Pin Hole Underneath Red Part 18677 Element 6168634 or 6109459 ×4
Plate Special 1 x 2 with Pin Hole on Top White Part 11458 Element 6632146 or 6057414 ×2

Bricks Sloped 20 pieces

Brick Sloped Inverted 33° 3 x 1 with Internal Stopper and No Front Stud Connection Black Part 4287c Element 428726 ×2
Brick Sloped 45° 2 x 1 with 2/3 Cutout [New Version] Dark Azure Part 15672 Element 6151668 ×4
Brick Sloped 30° 1 x 2 x 2/3 Dark Bluish Gray Part 85984 Element 4567887 ×9
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Light Bluish Gray Part 54200 Element 4521921 or 4244372 ×3
Brick Sloped Inverted 33° 3 x 1 with Internal Stopper and No Front Stud Connection Light Bluish Gray Part 4287c Element 4211489 ×2

Technic Bricks 17 pieces

Technic Brick 1 x 10 [9 Pin Holes] Black Part 2730 Element 273026 ×4
Technic Brick 1 x 2 [2 Pin Holes] Black Part 32000 Element 3200026 ×10
Technic Brick 1 x 10 [9 Pin Holes] Light Bluish Gray Part 2730 Element 4211374 ×1
Technic Pin Connector Block 1 x 5 x 3 Light Bluish Gray Part 32333 Element 6271360 or 4205761 ×2

Bricks Wedged 16 pieces

Brick Wedged, Curved 2 x 1 with Stud Notch Left Black Part 29120 Element 6181720 Also in Dark Bluish GrayAlso in Dark Blue ×1
Brick Wedged, Curved 2 x 1 with Stud Notch Right Black Part 29119 Element 6181713 Also in Dark Bluish GrayAlso in Dark Blue ×1
Brick Wedged, Curved 2 x 1 with Stud Notch Left Dark Blue Part 29120 Element 6214811 Also in Black ×3
Brick Wedged, Curved 2 x 1 with Stud Notch Right Dark Blue Part 29119 Element 6214812 Also in Black ×3
Brick Wedged, Curved 2 x 1 with Stud Notch Left Dark Bluish Gray Part 29120 Element 6204668 Also in Black ×4
Brick Wedged, Curved 2 x 1 with Stud Notch Right Dark Bluish Gray Part 29119 Element 6204667 Also in Black ×4

Bars, Ladders and Fences 14 pieces

Bar 1L with Clip [Cut Edges and One Side Hole] [Gap in Clip] Black Part 48729b Element 6278152 or 6037347 ×2
Bar 1L with Clip [Cut Edges and One Side Hole] [Gap in Clip] Light Bluish Gray Part 48729b Element 6278156 or 4542590 ×8
Bar 3L Light Bluish Gray Part 87994 Element 6093527 or 6064033 ×4

Tiles Round and Curved 10 pieces

Tile Round 2 x 2 with Bottom Stud Holder Black Part 14769 Element 6070695 ×3
Tile Round 1 x 1 with Bugatti Logo Print Dark Blue Part 98138pr0039 Element 6315333 or 6219604 ×4
Tile Round 1 x 1 Half Circle Light Bluish Gray Part 24246 Element 6250597 or 6151688 ×1
Tile Round 1 x 1 Lime Part 98138 Element 6284583 or 6057878 ×2

Plates Round Curved and Dishes 9 pieces

Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Dark Bluish Gray Part 2654 Element 4613980 or 4278274 ×4
Plate Round 1 x 1 with Solid Stud White Part 6141 Element 6601919 or 614101 ×5

Wheels and Tyres 9 pieces

Tyre 81.6 x 44 ZR Technic Straight Tread Black Part 23799 Element 6139227 ×4
Wheel 62.3 x 42 Large with Silver Outline Print Dark Blue Part 35187pr0001 Element 6217976 ×4
Wheel 11 x 8 with Center Groove Light Bluish Gray Part 42610 Element 4211758 ×1

Plates Wedged 8 pieces

Wedge Plate 7 x 6 Boat Bow with Stud Notches Black Part 50303 Element 4550190 or 4239365 ×2
Wedge Plate 2 x 2 Left Dark Azure Part 24299 Element 6145416 ×1
Wedge Plate 2 x 2 Right Dark Azure Part 24307 Element 6145418 ×1
Wedge Plate 4 x 2 Left Dark Blue Part 41770 Element 4529954 or 4247065 ×1
Wedge Plate 4 x 2 Right Dark Blue Part 41769 Element 4502091 or 4247066 ×1
Wedge Plate 4 x 4 Cut Corner Light Bluish Gray Part 30503 Element 4160560 ×2

String, Bands and Reels 6 pieces

String with End Studs 11L Overall Black Part 14226c11 Element 6096955 or 6037558 ×2
Rubber Belt Small [15mm ID] [Round Cross Section] White Part 85543 Element 6699001 or 4580665 ×2
Technic Rubber Belt Large [33mm ID] [Round Cross Section] Yellow Part 85546 Element 4544151 or 70905 ×2

Technic Special 6 pieces

Technic Tooth 1 x 3 with Axle Hole [Hollow Underside] Black Part 48267 Element 6288220 ×2
Technic Plate 1 x 5 with Smooth Ends, 4 Studs and Centre Axle Hole Blue Part 32124 Element 6280384 or 4112874 ×1
Technic Tooth 1 x 3 with Axle Hole [Hollow Underside] Dark Azure Part 48267 Element 6292486 ×2
Technic Changeover Catch - New Style Red Part 51149 Element 6313493 ×1

Minifig Upper Body 4 pieces

Arm Skeleton [Bent / 2 Clips] Dark Bluish Gray Part 93609 Element 6318697 or 6167900 ×4

Bricks Special 3 pieces

Brick Special 1 x 2 with Studs on 2 Sides Dark Tan Part 52107 Element 6135609 ×2
Brick Special 1 x 2 with 2 Studs on 1 Side Light Bluish Gray Part 11211 Element 6015344 ×1

Projectiles / Launchers 2 pieces

Launcher, Weapon Gun / Blaster / Shooter Mini Light Bluish Gray Part 15391 Element 6051333 ×2

Stickers 1 piece

Sticker Sheet for Set 42083-1 [No Color/Any Color] Part 38973 Element 6228775 ×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.

LEGO Missing Piece Checker

42083 Bugatti Chiron

Before you call it missing

Look-alike colors in this set

Your missing list

Piece checklist

Technic Pins 1,604 pieces

Technic Beams 634 pieces

Technic Connectors 411 pieces

Technic Axles 212 pieces

Technic Panels 119 pieces

Technic Steering, Suspension and Engine 94 pieces

Technic Gears 82 pieces