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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.

McLaren W1

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77257 McLaren W1

289 pieces in 116 part and color combinations, plus 1 minifigure.

LEGO counts 287 pieces. This inventory comes from a separate parts catalog and lists 294, including the 5 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.

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.

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Piece checklist

Black 133 pieces

  • Arm Mechanical with 2 Clips [Battle Droid] Black Part 30377 Element 6330086 or 4223247 1 spare in the box ×2
  • Arm Skeleton Bent with Clips at 90° [Vertical Grip] Black Part 93061 Element 6302313 ×2
  • Bar 2L with Stop in Center Black Part 78258 Element 6371584 1 spare in the box ×2
  • Bracket 1 x 1 - 1 x 1 Inverted Black Part 36840 Element 6234695 Also in Dark Bluish Gray ×6
  • Bracket 1 x 2 - 1 x 2 Inverted Black Part 99780 Element 6020193 ×8
  • Brick 1 x 4 Black Part 3010 Element 301026 ×1
  • Brick Curved 3 x 1 x 2/3 Black Part 7302 Element 6566851 ×2
  • Brick Round 1 x 1 Open Stud Black Part 3062b Element 306226 ×1
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Black Part 54200 Element 4504382 or 4287159 1 spare in the box ×2
  • Brick Sloped 30° 1 x 1 x 2/3 Double Corner Black Part 7826 Element 6573684 1 spare in the box ×2
  • Brick Special 1 x 1 with Studs on 2 Adjacent Sides Black Part 26604 Element 6187572 ×2
  • Brick Special 1 x 2 with 1 Center Stud on 1 Side, Bottom Stud Holder Black Part 86876 Element 6475339 ×2
  • Brick Special 1 x 2 with 2 Studs on 1 Side Black Part 11211 Element 6138173 ×1
  • Brick Wedged, Sloped 4 x 2 Triple Left Black Part 43710 Element 6040297 or 4180413 ×1
  • Brick Wedged, Sloped 4 x 2 Triple Right Black Part 43711 Element 6040298 or 4180423 ×1
  • Equipment Cleaver, 2 Holes Black Part 79811 Element 6395769 ×2
  • Hair Mid-Length Combed Behind Ear Black Part 36037 Element 6460731 ×1
  • Hinge Brick 1 x 2 Base Black Part 3937 Element 393726 ×4
  • Hinge Brick 1 x 2 Top Plate Thin Black Part 3938 Element 393826 Also in Dark Bluish Gray ×2
  • Large Figure Armor Plate, Small Black Part 28220 Element 6188823 ×1
  • Plate 1 x 5 Black Part 78329 Element 6350415 ×1
  • Plate 1 x 6 Black Part 3666 Element 366626 ×1
  • Plate 2 x 2 Black Part 3022 Element 302226 ×1
  • Plate 2 x 2 Corner Black Part 2420 Element 242026 ×4
  • Plate 2 x 4 Black Part 3020 Element 302026 ×2
  • Plate Round 1 x 1 with Open Stud Black Part 85861 Element 6168646 or 6100627 1 spare in the box ×8
  • Plate Round Corners 2 x 6 Double Black Part 18980 Element 6105963 ×1
  • Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] Black Part 4081b Element 6281993 or 4632571 ×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 Rounded with 2 Open Studs Black Part 35480 Element 6210270 Also in Dark Bluish Gray ×1
  • Plate Special 1 x 2 with Clip Horizontal on End Black Part 63868 Element 6336989 or 4535739 ×4
  • Plate Special 1 x 2 with Clip Horizontal on Side Black Part 11476 Element 6313116 or 6132731 ×3
  • Plate Special 1 x 2 with Handle on End [Closed Ends] Black Part 60478 Element 4515368 ×2
  • Plate Special 2 x 3 with Cloud Edge Black Part 5518 Element 6593250 ×3
  • Plate Special Round 1 x 1 with Hollow Stud and Horizontal Bar 1L Black Part 32828 Element 6196548 1 spare in the box ×2
  • Steering Wheel Small, 2 x 2 [Reinforced] Black Part 16091 Element 6057397 ×1
  • Tile 1 x 1 with Groove Black Part 3070b Element 307026 1 spare in the box ×2
  • Tile 1 x 1 with Medium Blue Squared Sphere, White Music Note, Gear, On/Off Button, Phone Print Black Part 3070bpr9848 Element 6585408 1 spare in the box ×1
  • Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×5
  • Tile 1 x 2 with Stud Notch Left Black Part 5091 Element 6510125 or 6458187 ×6
  • Tile 1 x 2 with Stud Notch Right Black Part 5092 Element 6510139 or 6458188 ×6
  • Tile 1 x 6 with Groove Black Part 6636 Element 663626 ×1
  • Tile 45° Cut 2 x 2 (Triangle) Black Part 35787 Element 6214807 ×2
  • Tile Round 1 x 1 Half Circle Black Part 24246 Element 6256435 1 spare in the box ×4
  • Tile Round 1 x 2 Half Circle with Double Exhaust Print Black Part 1748pr0002 Element 6585407 1 spare in the box ×1
  • Tile Round 2 x 4 Black Part 66857 Element 6331483 ×1
  • Tile Special 1 x 2 Diamond Plain Black Part 35649 Element 6490944 ×4
  • Tile Special Round 1 x 1 with Hollow Bar Black Part 20482 Element 6186675 or 6167933 1 spare in the box ×2
  • Vehicle Base 6 x 12 x 1 with Holes, 6 Studs On sides, 1 x 2 Cutouts on Ends Black Part 3385 Element 6605193 or 6424673 ×1
  • Wedge Plate 3 x 2 Left Black Part 43723 Element 4180536 ×1
  • Wedge Plate 3 x 2 Right Black Part 43722 Element 4180508 ×1
  • Wheel Cover 5 Spoke, No Rim Black Part 6825a ×4
  • Wheel Cover 9 Spoke, No Rim Black Part 6825b ×4
  • Wheel Rim 24 x 12 with Black Tyre Black Part 72206 Element 6336858 ×4

Orange 67 pieces

  • Bracket 1 x 2 - 2 x 2 Inverted Orange Part 99207 Element 6061676 ×1
  • Brick 2 x 4 Orange Part 3001 Element 4153827 or 4119641 ×1
  • Brick Curved 1 x 2 x 1 No Studs Orange Part 37352 Element 6385785 ×2
  • Brick Curved 2 x 2 x 2/3 with Black Triangle Print Orange Part 15068pr0112 Element 6585405 ×1
  • Brick Curved 2 x 2 x 2/3 with Black Triangle Print Orange Part 15068pr0113 Element 6585406 ×1
  • Brick Curved 3 x 1 x 2/3 Orange Part 7302 Element 6593852 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Orange Part 3660 Element 4118829 ×2
  • Brick Special 1 x 1 x 1 2/3 with Studs on 1 Side Orange Part 32952 Element 6261640 ×2
  • Brick Wedged, Curved 2 x 1 with Stud Notch Left Orange Part 29120 Element 6177499 ×2
  • Brick Wedged, Curved 2 x 1 with Stud Notch Right Orange Part 29119 Element 6177490 ×2
  • Brick Wedged, Curved 3 x 2 with Stud Notch Right with Headlight Print Orange Part 6929pr0022 Element 6585403 ×1
  • Brick Wedged, Curved 4 x 2 with Stud Notch Left with Headlight Print Orange Part 6930pr0022 Element 6585402 ×1
  • Plate 1 x 2 Orange Part 3023 Element 4177932 or 4163009 ×1
  • Plate 1 x 3 Orange Part 3623 Element 6147047 or 4513281 ×4
  • Plate 2 x 2 Corner Orange Part 2420 Element 6106027 or 4513271 ×10
  • Plate Special 2 x 2 with Horizontal T-Bar Underneath Orange Part 5066 Element 6593851 ×2
  • Plate Special 2 x 2 with Only 2 studs Orange Part 33909 Element 6400037 ×3
  • Tile 1 x 1 with Groove Orange Part 3070b Element 4558595 or 4277770 1 spare in the box ×6
  • Tile 1 x 2 with Black 'McLaren' Print Orange Part 3069bpr9890 Element 6585401 ×1
  • Tile 1 x 2 with Groove Orange Part 3069b Element 4188771 ×1
  • Tile 1 x 2 with Stud Notch Left Orange Part 5091 Element 6510130 or 6477748 ×4
  • Tile 1 x 2 with Stud Notch Right Orange Part 5092 Element 6510144 or 6477755 ×4
  • Tile 45° Cut 2 x 2 (Triangle) Orange Part 35787 Element 6346092 ×2
  • Tile Special 1 x 2 with Handle Orange Part 2432 Element 6253318 or 6060855 ×1
  • Tile Special 2 x 2 Corner with Cut Corner - Facet Orange Part 27263 Element 6184997 ×2
  • Wedge Plate 2 x 2 Left Orange Part 24299 Element 6173933 ×1
  • Wedge Plate 2 x 2 Right Orange Part 24307 Element 6173928 ×1
  • Wedge Tile 2 x 2 Left Orange Part 7828 Element 6593853 ×1
  • Wedge Tile 2 x 2 Right Orange Part 7829 Element 6593855 ×1
  • Wheel Arch, Mudguard 4 x 2 1/2 x 1 Orange Part 98282 Element 6593850 or 6353623 ×4

Dark Bluish Gray 19 pieces

  • Bracket 1 x 1 - 1 x 1 Inverted Dark Bluish Gray Part 36840 Element 6225494 Also in Black ×2
  • Brick Special 1 x 1 with Headlight Dark Bluish Gray Part 4070 Element 4211044 ×8
  • Brick Special 2 x 6 x 1 1/3 with Axle Holes and 2 x 4 Recessed, Ridges at Underside Dark Bluish Gray Part 3668 Element 6454959 ×2
  • Hinge Brick 1 x 2 Top Plate Thin Dark Bluish Gray Part 3938 Element 6176400 or 4541235 Also in Black ×2
  • Plate Special 1 x 2 Rounded with 2 Open Studs Dark Bluish Gray Part 35480 Element 6221607 Also in Black ×4
  • Tile 1 x 4 with Groove Dark Bluish Gray Part 2431 Element 4211053 ×1

Light Bluish Gray 17 pieces

  • Bracket 1 x 1 - 1 x 1 Light Bluish Gray Part 36841 Element 6248078 or 6227012 ×2
  • Bracket 1 x 1 - 1 x 1 Inverted Light Bluish Gray Part 36840 Element 6335328 ×4
  • Brick 1 x 1 Light Bluish Gray Part 3005 Element 4211389 ×4
  • Plate 1 x 4 Light Bluish Gray Part 3710 Element 4211445 ×1
  • Plate Special 1 x 2 with Handle on End [Closed Ends] Light Bluish Gray Part 60478 Element 4515369 ×2
  • Tile 2 x 2 Corner Light Bluish Gray Part 14719 Element 6065824 ×2
  • Tile Round 1 x 1 Light Bluish Gray Part 98138 Element 6284071 or 4650260 1 spare in the box ×2

Reddish Orange 8 pieces

  • Plant, Flower, Plate Round 1 x 1 with 5 Petals Reddish Orange Part 24866 Element 6475523 1 spare in the box ×8

Trans-Orange 7 pieces

  • Plate Round 1 x 1 with Open Stud Trans-Orange Part 85861 Element 6510162 or 6174023 1 spare in the box ×7

Trans-Red 6 pieces

  • Headwear Accessory Plume / Feather Small with Pin Trans-Red Part 87693 Element 6575165 2 spares in the box ×2
  • Plate 1 x 2 Trans-Red Part 3023 Element 6514003 or 6240212 ×4

White 6 pieces

  • Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) White Part 15573 Element 6550152 or 6051511 ×6

Dark Orange 5 pieces

  • Brick Curved 2 x 1 No Studs [1/2 Bow] Dark Orange Part 11477 Element 6186009 ×1
  • Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot] Dark Orange Part 99563 Element 6396922 ×4

Tan 4 pieces

  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×4

Red 3 pieces

  • Plate Special Round 1 x 1 with Hollow Stud and Horizontal Bar 1L Red Part 32828 Element 6384112 1 spare in the box ×3

Trans-Clear 3 pieces

  • Brick Special 1 x 1 with Headlight Trans-Clear Part 4070 Element 6514231 or 6244796 ×2
  • Tile 1 x 2 with Groove Trans-Clear Part 3069b Element 6514223 or 6251294 ×1

Trans-Dark Blue 3 pieces

  • Plate 2 x 4 Trans-Dark Blue Part 3020 Element 6513941 or 6476399 ×3

Green 2 pieces

  • Plate Round 1 x 1 with Solid Stud Green Part 6141 Element 4569058 or 4519965 1 spare in the box ×2

Trans-Black 2 pieces

  • Panel 1 x 2 x 2 with Silver Engine Cover Print Trans-Black Part 87552pr0017 Element 6585404 ×1
  • Windscreen 6 x 6 x 1 1/3 with Black Frame, White Lines Print Trans-Black Part 3383pr0003 Element 6585400 ×1

Yellow 2 pieces

  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×1
  • Plate 2 x 6 Yellow Part 3795 Element 379524 ×1

Flat Silver 1 piece

  • Tool Screwdriver and Spanner / Wrench Flat Silver Part 4006 Element 6167576 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 77257-1 [No Color/Any Color] Part 10115857 Element 6585757 ×1

Minifigures 1 figure

  • Race Driver, McLaren 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.

Request a replacement from LEGO

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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.

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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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