Free tool

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.

Koenigsegg Jesko Absolut Grey Hypercar

Checking

42173 Koenigsegg Jesko Absolut Grey Hypercar

801 pieces in 179 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.

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.

9 more look-alike pairs
  • Technic Beam 2 x 4 L-Shape Thick Black ×5 Dark Bluish Gray ×6 Black is darker than Dark Bluish Gray.
  • Technic Panel Fairing #21 5L Small Smooth, Side B Black ×1 Dark Bluish Gray ×1 Black is darker than Dark Bluish Gray.
  • Technic Panel Fairing #22 5L Small Smooth, Side A Black ×1 Dark Bluish Gray ×1 Black is darker than Dark Bluish Gray.
  • Technic Panel Fairing #7 3L Very Small Smooth, Side A Black ×3 Dark Bluish Gray ×4 Black is darker than Dark Bluish Gray.
  • Technic Panel Fairing #8 3L Very Small Smooth, Side B Black ×3 Dark Bluish Gray ×4 Black is darker than Dark Bluish Gray.
  • Technic Panel Fairing 2 x 3 x 1 Black ×4 Dark Bluish Gray ×9 Black is darker than Dark Bluish Gray.
  • Technic Pin Connector Round 1L [Beam] Black ×8 Dark Bluish Gray ×3 Black is darker than Dark Bluish Gray.
  • Tile 1 x 2 with Groove Black ×3 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
  • Tile 2 x 4 with Groove Black ×1 Dark Bluish Gray ×3 Black is darker than Dark Bluish Gray.
Show

Piece checklist

Black 267 pieces

  • Bar 4L (Lightsaber Blade / Wand) Black Part 30374 Element 6116604 or 4140303 ×1
  • Bar Holder with Clip Black Part 11090 Element 6315887 or 6015891 ×2
  • Brick Curved 2 x 1 No Studs [1/2 Bow] Black Part 11477 Element 6047276 Also in Dark Bluish Gray ×2
  • Brick Curved 2 x 2 x 2/3 Black Part 15068 Element 6053077 ×4
  • Brick Curved Inverted 4 x 1 Black Part 13547 Element 6039869 ×2
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Black Part 54200 Element 4504382 or 4287159 1 spare in the box Also in Dark Bluish Gray ×1
  • Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×1
  • Engine / Air Scoop 2 x 2 Black Part 50943 Element 6507769 or 4585748 ×1
  • Equipment Cleaver, 2 Holes Black Part 79811 Element 6395769 ×1
  • Large Figure Wing, Small Black Part 61800 Element 6501505 or 6211890 ×2
  • Plate 1 x 3 Black Part 3623 Element 362326 ×1
  • Plate 2 x 2 Black Part 3022 Element 302226 ×1
  • Plate 2 x 8 Black Part 3034 Element 303426 ×1
  • Plate Round 1 x 1 with Open Stud Black Part 85861 Element 6168646 or 6100627 1 spare in the box ×2
  • Plate Round Corners 2 x 6 Double Black Part 18980 Element 6105963 ×1
  • Plate Special 1 x 1 Rounded with Handle Black Part 26047 Element 6157554 ×2
  • Plate Special 1 x 1 x 2/3 Half Round with Side Stud Black Part 3386 Element 6424674 ×2
  • Plate Special 1 x 2 with Pin Hole Underneath Black Part 18677 Element 6192309 or 6167497 ×6
  • Technic Axle 4 Black Part 3705 Element 370526 ×10
  • Technic Axle Connector with Axle Hole [Reinforced] Black Part 42135 Element 6331716 ×1
  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle Black Part 18651 Element 6089119 ×15
  • Technic Axle and Pin Connector Angled #1 Black Part 32013 Element 6284699 or 4107085 ×4
  • Technic Axle and Pin Connector Angled #3 - 157.5° Black Part 32016 Element 6261386 or 4107082 ×2
  • Technic Axle and Pin Connector Angled #4 - 135° Black Part 32192 Element 6262897 or 4121610 ×2
  • Technic Axle and Pin Connector Perpendicular Black Part 6536 Element 6261371 or 4173668 Also in Dark Bluish Gray ×20
  • Technic Axle and Pin Connector Perpendicular Triple Black Part 63869 Element 6362991 or 6007966 ×1
  • Technic Beam 1 x 13 Thick Black Part 41239 Element 4522933 or 4164422 Also in Dark Bluish Gray ×5
  • Technic Beam 1 x 2 Thick Black Part 43857 Element 4385726 or 4177444 Also in Dark Bluish Gray ×2
  • Technic Beam 1 x 2 Thin Black Part 41677 Element 6338428 or 4167726 Also in Dark Bluish Gray ×6
  • Technic Beam 1 x 3 Thick Black Part 32523 Element 4142822 or 3252326 ×2
  • Technic Beam 1 x 3 Thin Black Part 6632 Element 6331723 or 4107828 ×10
  • Technic Beam 1 x 9 Thick Black Part 40490 Element 4645732 or 4542788 ×2
  • Technic Beam 2 x 4 L-Shape Thick Black Part 32140 Element 6271825 or 4120017 Also in Dark Bluish Gray ×5
  • Technic Beam 2 x 5 L-Shape with Quarter Ellipse Thick Black Part 80286 Element 6407066 or 6378466 ×2
  • Technic Beam 3 x 5 L-Shape Thick Black Part 32526 Element 4142823 or 3252626 ×2
  • Technic Beam Frame 3 x 13 with 1 Center Cross Beams, 2 Openings Thick Black Part 4526 Element 6452876 ×2
  • Technic Bush Black Part 3713 Element 6332148 or 6210506 1 spare in the box ×2
  • Technic Disc 3 x 3 Black Part 2723 Element 4218868 or 4121619 ×2
  • Technic Driving Ring Connector Smooth [2 rounded and 2 flat side walls] Black Part 42195 Element 6286381 ×2
  • Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×4
  • Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] Black Part 18575 Element 6346535 or 6093977 ×1
  • Technic Gear Rack 1 x 13 with Axle and Pin Holes Black Part 64781 Element 6302830 or 4540906 ×1
  • Technic Gear Rack 1 x 7 with Axle and Pin Holes Black Part 87761 Element 6327430 or 4562009 ×1
  • Technic Panel Fairing #21 5L Small Smooth, Side B Black Part 11946 Element 6316923 or 6023036 Also in Dark Bluish Gray ×1
  • Technic Panel Fairing #22 5L Small Smooth, Side A Black Part 11947 Element 6319983 or 6022761 Also in Dark Bluish Gray ×1
  • Technic Panel Fairing #7 3L Very Small Smooth, Side A Black Part 2387 Element 6510991 or 6426589 Also in Dark Bluish Gray ×3
  • Technic Panel Fairing #8 3L Very Small Smooth, Side B Black Part 2389 Element 6513874 or 6426590 Also in Dark Bluish Gray ×3
  • Technic Panel Fairing 2 x 3 x 1 Black Part 71682 Element 6331026 Also in Dark Bluish Gray ×4
  • Technic Pin Connector 3L with 2 Pins and Center Hole [Pin Ridges Across Part] Black Part 46189 Element 6325521 or 6267991 ×2
  • Technic Pin Connector Double with Bar [2 Holes] Black Part 85940 Element 6173124 or 4562148 ×2
  • Technic Pin Connector Hub with 1 Axle Black Part 22961 Element 6253260 ×4
  • Technic Pin Connector Hub with 2 Axles Black Part 27940 Element 6396457 ×1
  • Technic Pin Connector Perpendicular 2 x 2 Bent Black Part 44809 Element 6325982 or 4480926 ×4
  • Technic Pin Connector Round 1L [Beam] Black Part 18654 Element 6121485 1 spare in the box Also in Dark Bluish Gray ×8
  • Technic Pin Connector Round [Slotted] Black Part 62462 Element 6173119 or 4526982 ×4
  • Technic Pin Connector Toggle Joint Smooth Double with Axle and Pin Holes Black Part 87408 Element 6278412 or 4558692 ×3
  • Technic Pin with Friction Ridges Lengthwise with No Center Slots Black Part 61332 Element 6279875 3 spares in the box ×64
  • Technic Steering Wheel Pilot's Yoke [Closed Top] Black Part 49151 Element 6378464 ×1
  • Tile 1 x 2 with Groove Black Part 3069b Element 306926 Also in Dark Bluish Gray ×3
  • Tile 2 x 3 Black Part 26603 Element 6162892 ×1
  • Tile 2 x 4 with Groove Black Part 87079 Element 4560182 Also in Dark Bluish Gray ×1
  • Tile Round 1 x 1 Black Part 98138 Element 6284070 or 6139403 1 spare in the box ×8
  • Tile Round 1 x 1 Half Circle Black Part 24246 Element 6256435 1 spare in the box ×2
  • Tyre 43.2 x 14 Black Part 30699 Element 6518575 or 6182551 ×2
  • Tyre 43.2 x 22 ZR Black Part 44309 Element 4184286 ×2
  • Wheel 30 x 14 Black Part 56904 Element 6251174 ×2
  • Wheel 30.4 x 20 without Pinholes, with Reinforced Rim Black Part 56145 Element 4299389 or 4284946 ×2

Dark Bluish Gray 175 pieces

  • Bracket 1 x 1 - 1 x 1 Inverted Dark Bluish Gray Part 36840 Element 6225494 ×2
  • Brick Curved 2 x 1 No Studs [1/2 Bow] Dark Bluish Gray Part 11477 Element 6029948 Also in Black ×2
  • Brick Curved 3 x 2 No Studs Dark Bluish Gray Part 24309 Element 6501502 ×1
  • Brick Round Corner, Curved 3 x 3 x 1 Quarter Circle Dark Bluish Gray Part 76797 Element 6440667 ×2
  • Brick Sloped 1 x 6 x 1 with 1 x 2 x 1/3 Cutout Dark Bluish Gray Part 4569 Element 6508011 or 6470155 ×4
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Dark Bluish Gray Part 54200 Element 4504378 or 4244373 1 spare in the box Also in Black ×2
  • Brick Wedged, Curved 2 x 1 with Stud Notch Left Dark Bluish Gray Part 29120 Element 6204668 ×3
  • Brick Wedged, Curved 2 x 1 with Stud Notch Right Dark Bluish Gray Part 29119 Element 6204667 ×3
  • Brick Wedged, Curved 3 x 2 with Stud Notch Left Dark Bluish Gray Part 80177 Element 6375813 ×1
  • Brick Wedged, Curved 3 x 2 with Stud Notch Right Dark Bluish Gray Part 80178 Element 6375817 ×1
  • Plate 1 x 1 Dark Bluish Gray Part 3024 Element 4210719 1 spare in the box ×4
  • Plate 1 x 2 Dark Bluish Gray Part 3023 Element 4211063 ×6
  • Plate 1 x 5 Dark Bluish Gray Part 78329 Element 6413109 ×5
  • Plate 1 x 8 Dark Bluish Gray Part 3460 Element 4210998 ×1
  • Plate Special 1 x 2 with Pin Hole on Top Dark Bluish Gray Part 11458 Element 6019987 ×2
  • Technic Axle 4 with Stop Dark Bluish Gray Part 87083 Element 6083620 or 4560177 ×3
  • Technic Axle 8 with Stop Dark Bluish Gray Part 55013 Element 4499858 ×1
  • Technic Axle and Pin Connector Perpendicular Dark Bluish Gray Part 6536 Element 6536199 or 6261374 Also in Black ×4
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Dark Bluish Gray Part 42003 Element 6273715 or 4210857 ×4
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Dark Bluish Gray Part 32184 Element 32184199 or 6276984 ×6
  • Technic Axle and Pin Connector Perpendicular Double Dark Bluish Gray Part 32291 Element 6280395 or 4210655 ×4
  • Technic Axle and Pin Connector Toggle Joint Smooth Dark Bluish Gray Part 32126 Element 6457116 or 6353304 ×4
  • Technic Beam 1 x 13 Thick Dark Bluish Gray Part 41239 Element 4522937 or 4261932 Also in Black ×2
  • Technic Beam 1 x 2 Thick Dark Bluish Gray Part 43857 Element 6325983 or 6179631 Also in Black ×2
  • Technic Beam 1 x 2 Thin Dark Bluish Gray Part 41677 Element 6338422 or 4210980 Also in Black ×18
  • Technic Beam 1 x 7 Thick Dark Bluish Gray Part 32524 Element 4495931 or 4210752 ×4
  • Technic Beam 2 x 3 L-Shape with Quarter Ellipse Thick Dark Bluish Gray Part 71708 Element 6353303 ×4
  • Technic Beam 2 x 4 L-Shape Thick Dark Bluish Gray Part 32140 Element 6271830 or 4210667 Also in Black ×6
  • Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Dark Bluish Gray Part 32064a Element 6178919 or 4210935 ×2
  • Technic Gear Differential with Inner Tabs and Closed Center, 28 Bevel Teeth [Beveled Edge] Dark Bluish Gray Part 62821b Element 4562210 or 4525184 ×1
  • Technic Panel Curved 3 x 9 Dark Bluish Gray Part 5427 Element 6501504 ×2
  • Technic Panel Fairing # 3 Small Smooth Long, Side A Dark Bluish Gray Part 64683 Element 6431193 or 6248903 ×1
  • Technic Panel Fairing # 4 Small Smooth Long, Side B Dark Bluish Gray Part 64391 Element 6431194 or 6248902 ×1
  • Technic Panel Fairing #1 Small Smooth Short, Side A Dark Bluish Gray Part 87080 Element 6501501 or 6013548 ×1
  • Technic Panel Fairing #10 Medium Triangle Smooth Dark Bluish Gray Part 2403 Element 6510088 or 6426608 ×4
  • Technic Panel Fairing #2 Small Smooth Short, Side B Dark Bluish Gray Part 87086 Element 6501500 or 6303445 ×1
  • Technic Panel Fairing #21 5L Small Smooth, Side B Dark Bluish Gray Part 11946 Element 6330085 or 6197965 Also in Black ×1
  • Technic Panel Fairing #22 5L Small Smooth, Side A Dark Bluish Gray Part 11947 Element 6352665 or 6197945 Also in Black ×1
  • Technic Panel Fairing #5 Long Smooth, Side A Dark Bluish Gray Part 64681 Element 6435026 ×2
  • Technic Panel Fairing #6 Long Smooth, Side B Dark Bluish Gray Part 64393 Element 6435025 ×2
  • Technic Panel Fairing #7 3L Very Small Smooth, Side A Dark Bluish Gray Part 2387 Element 6510994 or 6430276 Also in Black ×4
  • Technic Panel Fairing #8 3L Very Small Smooth, Side B Dark Bluish Gray Part 2389 Element 6513877 or 6430295 Also in Black ×4
  • Technic Panel Fairing #9 Medium Triangle Smooth Dark Bluish Gray Part 2395 Element 6510082 or 6426607 ×4
  • Technic Panel Fairing 2 x 1 x 1 Dark Bluish Gray Part 89679 Element 6501499 ×4
  • Technic Panel Fairing 2 x 3 x 1 Dark Bluish Gray Part 71682 Element 6435030 Also in Black ×9
  • Technic Panel Fairing 2 x 3 x 1 #3 Angled 157.5° Dark Bluish Gray Part 2457 Element 6510093 or 6426611 ×1
  • Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge] Dark Bluish Gray Part 65487 Element 6282144 ×7
  • Technic Pin Connector Hub with 2 Perpendicular Axles Dark Bluish Gray Part 10197 Element 6005331 ×6
  • Technic Pin Connector Round 1L [Beam] Dark Bluish Gray Part 18654 Element 6100030 1 spare in the box Also in Black ×3
  • Technic Tooth 1 x 3 with Axle Hole [Hollow Underside] Dark Bluish Gray Part 48267 Element 6504969 or 6285600 ×2
  • Tile 1 x 1 with Groove Dark Bluish Gray Part 3070b Element 4210848 1 spare in the box ×2
  • Tile 1 x 2 with Groove Dark Bluish Gray Part 3069b Element 4211052 Also in Black ×2
  • Tile 1 x 4 with Groove Dark Bluish Gray Part 2431 Element 4211053 ×1
  • Tile 1 x 6 with Groove Dark Bluish Gray Part 6636 Element 4210651 ×3
  • Tile 2 x 4 with Groove Dark Bluish Gray Part 87079 Element 4560184 Also in Black ×3

Red 109 pieces

  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×36
  • Technic Axle 6 Red Part 3706 Element 6130002 or 4191526 ×1
  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Red Part 11214 Element 6209519 ×13
  • Technic Axle and Pin Connector Perpendicular Red Part 6536 Element 6261373 or 4188298 ×2
  • Technic Axle and Pin Connector Perpendicular Double Red Part 32291 Element 6280393 or 4241474 ×4
  • Technic Bush Red Part 3713 Element 6271820 or 4227155 1 spare in the box ×5
  • Technic Pin 1/2 with Friction Red Part 89678 Element 6378120 2 spares in the box ×44
  • Technic Pin Connector Hub with 1 Axle Red Part 22961 Element 6167939 ×4

Light Bluish Gray 100 pieces

  • Bar 3L Light Bluish Gray Part 87994 Element 6093527 or 6064033 1 spare in the box ×1
  • Plate 1 x 1 Light Bluish Gray Part 3024 Element 4211399 1 spare in the box ×2
  • Plate 1 x 4 Light Bluish Gray Part 3710 Element 4211445 ×1
  • Plate 2 x 2 Corner Light Bluish Gray Part 2420 Element 4211353 ×2
  • Plate 2 x 3 Light Bluish Gray Part 3021 Element 4211396 ×2
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×14
  • Technic Axle 7 Light Bluish Gray Part 44294 Element 44294194 or 4211805 ×6
  • Technic Axle Connector Smooth [with x Hole + Orientation] Light Bluish Gray Part 59443 Element 4512360 ×4
  • Technic Axle Connector with Axle Hole [Reinforced] Light Bluish Gray Part 42135 Element 6380605 ×11
  • Technic Axle and Pin Connector Angled #1 Light Bluish Gray Part 32013 Element 6296859 or 4211550 ×2
  • Technic Axle and Pin Connector Angled #2 - 180° Light Bluish Gray Part 32034 Element 6346487 or 4211567 ×2
  • Technic Axle and Pin Connector Angled #6 - 90° Light Bluish Gray Part 32014 Element 6268924 or 4509886 ×2
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Light Bluish Gray Part 42003 Element 6273724 or 4211779 ×7
  • Technic Beam 1 x 11 Thick with Alternating Holes Light Bluish Gray Part 73507 Element 6362250 ×3
  • Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Light Bluish Gray Part 60483 Element 6265089 or 6004888 ×12
  • Technic Beam 1 x 5 Thick Light Bluish Gray Part 32316 Element 4211651 ×1
  • Technic Beam 3 x 3 T-Shape Thick Light Bluish Gray Part 60484 Element 4552348 or 4535772 ×2
  • Technic Brick 1 x 1 with Axle Hole Light Bluish Gray Part 73230 Element 6336539 ×4
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 2 spares in the box ×9
  • Technic Crank Disc Light Bluish Gray Part 4368 Element 6452845 ×4
  • Technic Pin Connector Hub Perpendicular 3L with 2 Pins Light Bluish Gray Part 2393 Element 6408168 ×2
  • Technic Pin Connector Hub Perpendicular 3L with 4 Pins (Squared Holes) Light Bluish Gray Part 65489 Element 6282158 ×2
  • Technic Pin Connector Hub with 1 Axle Light Bluish Gray Part 22961 Element 6123815 ×4
  • Tile Special 2 x 2 with Top Pin [Squared Holes] Light Bluish Gray Part 49153 Element 6313188 ×1

Blue 84 pieces

  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×42
  • Technic Beam 1 x 2 Thick Blue Part 43857 Element 6057802 or 4185665 ×4
  • Technic Beam 1 x 2 Thin Blue Part 41677 Element 6360123 or 4186834 ×4
  • Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot Blue Part 42924 Element 6299413 ×34

Yellow 21 pieces

  • Technic Axle 5 Yellow Part 32073 Element 6130008 ×6
  • Technic Axle 9 Yellow Part 60485 Element 6130010 ×2
  • Technic Axle Connector Smooth [with x Hole + Orientation] Yellow Part 59443 Element 4519010 ×1
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Yellow Part 42003 Element 6273711 or 4200324 ×2
  • Technic Engine Crankshaft Yellow Part 2853 Element 6640378 or 4119474 ×2
  • Technic Piston Yellow Part 4369 Element 6452846 ×8

Orange 20 pieces

  • Technic Axle and Pin Connector Perpendicular Orange Part 6536 Element 6261377 or 6135088 ×4
  • Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Orange Part 60483 Element 6265128 or 6057526 ×4
  • Technic Beam 1 x 3 Thick Orange Part 32523 Element 6102618 or 4655127 ×2
  • Technic Panel Fairing 2 x 3 x 1 Orange Part 71682 Element 6358255 ×4
  • Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge] Orange Part 65487 Element 6390390 ×2
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole] Orange Part 65304 Element 6347790 ×4

Tan 13 pieces

  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×2
  • Technic Gear 12 Tooth Bevel Tan Part 6589 Element 4565452 or 4514556 ×7
  • Technic Pin 3/4 Tan Part 32002 Element 6663097 or 6013938 1 spare in the box ×4

Reddish Brown 5 pieces

  • Technic Axle 3 with Stop Reddish Brown Part 24316 Element 6135494 ×5

Pearl Gold 2 pieces

  • Technic Pin Connector Round 1L [Beam] Pearl Gold Part 18654 Element 6256803 1 spare in the box ×2

Trans-Red 2 pieces

  • Technic Tooth 1 x 3 with Axle Hole [Hollow Underside] Trans-Red Part 48267 Element 6514318 or 6275769 ×2

Sand Green 1 piece

  • Plate 2 x 3 with 1 x 1 Cutout Sand Green Part 73831 Element 6432746 ×1

White 1 piece

  • Technic Pin Connector Hub with 2 Perpendicular Axles White Part 10197 Element 6507770 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 42173-1 [No Color/Any Color] Part 10105329 Element 6462842 ×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.