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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

42141 McLaren Formula 1 Team 2022 (First Edition)

1,432 pieces in 212 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. 4 parts in this set come in two colors that are easy to mix up; they are listed below.
The spare pieces. This set comes with 18 spare pieces, marked on each row of the checklist. One may be the piece you need.
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.

Technic Axle and Pin Connector Angled #2 - 180° Black ×8 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Black ×1 Dark Bluish Gray ×15 Black is darker than Dark Bluish Gray.
Technic Beam 1 x 3 Thick Black ×8 Dark Bluish Gray ×6 Black is darker than Dark Bluish Gray.
Technic Pin Connector Hub with 1 Axle Black ×6 Dark Bluish Gray ×4 Black is darker than Dark Bluish Gray.

Piece checklist

Bricks Curved 24 pieces

Brick Curved 1 x 2 x 1 1/3 with Curved Top Black Part 6091 Element 6383142 or 6184784 ×4
Brick Curved 3 x 1 No Studs Black Part 50950 Element 4251161 ×2
Brick Curved 1 x 2 x 1 1/3 with Curved Top Blue Part 6091 Element 6347945 or 4519981 ×8
Brick Curved 1 x 2 x 1 1/3 with Curved Top Orange Part 6091 Element 6411362 or 6112356 ×4
Brick Curved 2 x 1 No Studs [1/2 Bow] Orange Part 11477 Element 6055069 ×4
Brick Curved 3 x 1 No Studs Orange Part 50950 Element 4251969 ×2

Technic Bushes 24 pieces

Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 1 spare in the box ×8
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 1 spare in the box ×16

Plates Round Curved and Dishes 18 pieces

Plate Round 1 x 1 with Solid Stud Black Part 6141 Element 614126 1 spare in the box ×2
Plate Special 1 x 2 Rounded with 2 Open Studs Black Part 35480 Element 6210270 ×5
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Blue Part 4032a Element 403223 ×4
Plate Special 1 x 2 Rounded with 2 Open Studs White Part 35480 Element 6552167 or 6550175 ×7

Technic Beams Special 15 pieces

Technic Beam 3 x 0.5 Liftarm with Boss and Blocked, Squared Pin Hole Black Part 61408 Element 6313520 ×2
Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] Black Part 14720 Element 6390379 ×4
Technic Beam Frame 11 x 15 Black Part 39790 Element 6295161 ×2
Technic Beam Frame 3 x 19 with 2 Center Cross Beams, 3 Openings Thick Black Part 67491 Element 6377025 ×2
Technic Beam 5 x 11 with 3 x 5 Opening Frame Thick Light Bluish Gray Part 64178 Element 4540797 ×1
Technic Beam 3 x 0.5 Liftarm with Boss and Blocked, Squared Pin Hole Orange Part 61408 Element 6391883 ×2
Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick Orange Part 64179 Element 6390599 ×2

Tiles 15 pieces

Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×2
Tile 2 x 3 Black Part 26603 Element 6162892 ×4
Tile 2 x 6 Black Part 69729 Element 6318582 ×2
Tile 1 x 1 with Groove Orange Part 3070b Element 4558595 or 4277770 1 spare in the box ×4
Tile 2 x 2 with Groove Orange Part 3068b Element 4542142 or 4125268 ×2
Tile 1 x 1 with Groove Trans-Red Part 3070b Element 6581817 or 6254248 1 spare in the box ×1

Hinges, Arms and Turntables 10 pieces

Hinge Cylinder 1 x 2 Locking with 1 Finger and Axle Hole On Ends [No Side Slots] Black Part 53923 Element 6265699 ×2
Hinge Plate 1 x 2 Locking with 2 Fingers On End, without Groove, 7 Teeth Black Part 54657 Element 6267045 ×2
Hinge Plate 2 x 4 with Pin Hole with 2 Holes - Top Black Part 43045 Element 6256116 ×2
Hinge Plate 1 x 2 Locking with 1 Finger On End, without Groove Orange Part 44301b Element 6390385 ×2
Hinge Plate 1 x 2 Locking with 2 Fingers on Side, 7 Teeth Orange Part 50340 Element 6266212 ×2

Technic Gears 9 pieces

Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×1
Technic Gear Rack 1 x 7 with Axle and Pin Holes Black Part 87761 Element 6327430 or 4562009 ×1
Technic Gear 8 Tooth [Reinforced] Dark Bluish Gray Part 10928 Element 6631413 or 6012451 ×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 Gear 12 Tooth Bevel Tan Part 6589 Element 4565452 or 4514556 ×3
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] Tan Part 18575 Element 6346517 or 6084724 ×1

Plates Special 8 pieces

Plate Special 1 x 2 with Pin Hole Underneath Black Part 18677 Element 6192309 or 6167497 ×4
Plate Special Round 8 x 8 with 2 x 2 Center Studs with Groove Black Part 6177b Element 4205860 or 617726 ×4

Wheels and Tyres 8 pieces

Tyre 81.6 x 44 R Black Part 18450 Element 6482460 or 6199832 ×4
Wheel 43.2 x 26 Technic Racing Small with 6 Pinholes Black Part 56908 Element 6276858 or 6078892 ×4

Bars, Ladders and Fences 6 pieces

Bar 3L Black Part 87994 Element 6185316 or 6093525 1 spare in the box ×2
Bar 2L with Stop in Center White Part 78258 Element 6357680 1 spare in the box ×4

Flags, Banners and Signs 6 pieces

Flag 2 x 2 Trapezoid with Flared Area between Clips Black Part 80324 Element 6363033 ×6

Pneumatics 6 pieces

Pneumatic Hose Connector with Axle Connector Dark Bluish Gray Part 99021 Element 6265669 or 6020189 ×6

Bricks Round and Cones 4 pieces

Brick Round 4 x 4 with 4 Side Pin Holes and Center Axle Hole Dark Bluish Gray Part 6222 Element 4211097 ×4

Plates 4 pieces

Plate 1 x 2 Orange Part 3023 Element 4177932 or 4163009 ×4

Tiles Round and Curved 4 pieces

Tile Round 2 x 2 with Bottom Stud Holder Black Part 14769 Element 6070695 ×4

Stickers 3 pieces

Sticker Sheet 1 for Set 42141-1 [No Color/Any Color] Part 10100112 Element 6401184 ×1
Sticker Sheet 2 for Set 42141-1 [No Color/Any Color] Part 10100113 Element 6401192 ×1
Sticker Sheet 3 for Set 42141-1 [No Color/Any Color] Part 01677 Element 6390930 ×1

Technic Bricks 3 pieces

Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Black Part 32064a Element 6178922 or 4233487 ×1
Technic Pin Connector Block 1 x 5 x 3 Black Part 32333 Element 6271358 or 4141810 ×2

Technic Special 2 pieces

Technic Cam Black Part 6575 Element 4143187 ×2

Bricks Sloped 1 piece

Brick Sloped 75° 2 x 1 x 3 with Hollow Stud Black Part 4460b Element 446026 ×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

42141 McLaren Formula 1 Team 2022 (First Edition)

Before you call it missing

Look-alike colors in this set

Your missing list

Piece checklist

Technic Pins 528 pieces

Technic Beams 267 pieces

Technic Connectors 205 pieces

Technic Axles 123 pieces

Technic Panels 76 pieces