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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

42228 McLaren MCL39 F1 Car

1,675 pieces in 265 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. 9 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 28 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.

Plate 1 x 2 Black ×2 Dark Bluish Gray ×1 Black is darker than Dark Bluish Gray.
Technic Axle Connector Smooth [with x Hole + Orientation] Black ×2 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Perpendicular Black ×2 Dark Bluish Gray ×3 Black is darker than Dark Bluish Gray.
Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Black ×10 Dark Bluish Gray ×4 Black is darker than Dark Bluish Gray.
Technic Beam 1 x 3 Thin Black ×6 Dark Bluish Gray ×8 Black is darker than Dark Bluish Gray.
Technic Beam 1 x 7 Thick Black ×2 Dark Bluish Gray ×3 Black is darker than Dark Bluish Gray.

3 more look-alike pairs

Technic Beam 1 x 7 Thick with Alternating Holes Black ×2 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
Technic Beam 2 x 4 L-Shape Thick Black ×14 Dark Bluish Gray ×15 Black is darker than Dark Bluish Gray.
Technic Pin Connector Round 1L [Beam] Black ×27 Dark Bluish Gray ×9 Black is darker than Dark Bluish Gray.

Piece checklist

Technic Bushes 25 pieces

Technic Bush Black Part 3713 Element 6332148 or 6210506 1 spare in the box ×1
Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 1 spare in the box ×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 ×18
Technic Bush Red Part 3713 Element 6271820 or 4227155 1 spare in the box ×2

Technic Beams Special 19 pieces

Technic Beam 2 x 3 Thick [90° Offset Centre Beam Hole] Black Part 3167 Element 6563620 ×1
Technic Beam Frame 3 x 13 with 1 Center Cross Beams, 2 Openings Thick Black Part 4526 Element 6452876 ×4
Technic Beam Frame 3 x 19 with 2 Center Cross Beams, 3 Openings Thick Black Part 67491 Element 6377025 ×2
Technic Pin Connector Double with Bar [2 Holes] Black Part 85940 Element 6173124 or 4562148 ×3
Technic Beam 1 x 2 with Towball Straight Light Bluish Gray Part 5995 Element 6506199 ×4
Technic Beam 5 x 11 with 3 x 5 Opening Frame Thick Light Bluish Gray Part 64178 Element 4540797 ×1
Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick Light Bluish Gray Part 64179 Element 4539880 ×2
Technic Beam Special 1 x 5 x 3 Light Bluish Gray Part 6614 Element 6508522 ×1
Technic Beam 1 x 2 with Axle on Side Orange Part 7244 Element 6540720 ×1

Bricks Curved 14 pieces

Brick Curved 10 x 1 [Symmetric Inside Ridges] Black Part 13731 Element 6037664 ×2
Brick Curved 2 x 1 No Studs [1/2 Bow] Black Part 11477 Element 6047276 ×3
Brick Curved 8 x 2 No Studs Black Part 42918 Element 6296083 ×2
Brick Curved 2 x 1 No Studs [1/2 Bow] Dark Azure Part 11477 Element 6137300 ×2
Brick Curved 10 x 1 [Symmetric Inside Ridges] Orange Part 13731 Element 6601283 or 6121293 ×2
Brick Curved 2 x 2 x 2/3 Orange Part 15068 Element 6067913 ×2
Brick Curved 4 x 2 No Studs Orange Part 93606 Element 6054529 ×1

Bricks Round and Cones 14 pieces

Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end Black Part 25214 Element 6179182 ×8
Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×3
Dome 1 x 1 x 2/3 Black Part 6908 Element 6560654 1 spare in the box ×1
Brick Round 2 x 2 [Grill] Light Bluish Gray Part 92947 Element 4650645 or 4610816 ×2

Tiles 14 pieces

Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×2
Tile 1 x 8 with Groove Black Part 4162 Element 416226 ×4
Tile 1 x 2 with Groove Orange Part 3069b Element 4188771 ×2
Tile 1 x 4 with Groove Orange Part 2431 Element 4160593 ×2
Tile 1 x 6 with Groove Orange Part 6636 Element 4650690 or 4524966 ×2
Tile 1 x 4 with Groove Trans-Red Part 2431 Element 6510184 or 6390369 ×2

Plates Round Curved and Dishes 13 pieces

Plate Round 1 x 1 with Open Stud Black Part 85861 Element 6168646 or 6100627 1 spare in the box ×4
Plate Special 1 x 2 Rounded with 2 Open Studs Black Part 35480 Element 6210270 ×2
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Dark Bluish Gray Part 4032a Element 4211042 ×2
Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Dark Bluish Gray Part 2654 Element 4613980 or 4278274 ×1
Plate Round 1 x 1 with Solid Stud Flat Silver Part 6141 Element 4633691 1 spare in the box ×4

Wheels and Tyres 12 pieces

Tyre 81.6 x 44 Slick with White 'PIRELLI', 'P ZERO' Print Black Part 4410pr0003 Element 6582836 ×4
Wheel 56 x 34 Technic Racing Medium with 6 Pin Holes Black Part 15038 Element 6284703 or 6253256 ×4
Wheel Cover for Wheel 34 x 56 with Green/Yellow/Red/Blue Circle Print Black Part 4472pr0002 Element 6618713 ×4

Plates Special 9 pieces

Plate Special Round 1 x 2 Half Circle with Stud (Jumper) Black Part 1745 Element 6510061 or 6438919 ×2
Plate Special 1 x 3 with 2 Studs with Groove and Inside Stud Holder (Jumper) Light Bluish Gray Part 34103 Element 6211969 ×1
Plate Special Round 2 x 2 with Center Stud (Jumper Plate) Lime Part 18674 Element 6610720 ×4
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Orange Part 15573 Element 6092599 ×2

Technic Special 8 pieces

Technic Rotor Blade Small with Hole and Axle Connector End Black Part 99012 Element 6442361 ×5
Technic Tooth 1 x 3 with Axle Hole [Hollow Underside] Black Part 48267 Element 6288220 ×2
Technic Changeover Catch - New Style Red Part 51149 Element 6313493 ×1

Bars, Ladders and Fences 4 pieces

Bar 3L Black Part 87994 Element 6185316 or 6093525 1 spare in the box ×2
Bar 3L Tan Part 87994 Element 6443062 1 spare in the box ×2

Hinges, Arms and Turntables 4 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

Tiles Special 3 pieces

Tile Special 1 x 2 Grille with Bottom Groove Black Part 2412b Element 241226 ×1
Tile Special Round 2 x 2 with Hole Dark Bluish Gray Part 15535 Element 6055313 ×1
Tile Special 1 x 2 Grille with Bottom Groove Trans-Red Part 2412b Element 6250158 or 4190187 ×1

Bricks Special 2 pieces

Brick Special 1 x 1 with Stud on 1 Side Light Bluish Gray Part 87087 Element 4558953 ×2

Bricks Wedged 2 pieces

Brick Wedged, Sloped 2 x 5 Left Orange Part 3504 Element 6560246 ×1
Brick Wedged, Sloped 2 x 5 Right Orange Part 3505 Element 6560247 ×1

Stickers 2 pieces

Sticker Sheet 1 for Set 42228-1 [No Color/Any Color] Part 10118992 Element 6627258 ×1
Sticker Sheet 2 for Set 42228-1 [No Color/Any Color] Part 10117460 Element 6606388 ×1

Technic Bricks 2 pieces

Technic Brick 1 x 1 with Axle Hole Red Part 73230 Element 6473604 ×2

Tiles Round and Curved 2 pieces

Tile Round 1 x 1 Black Part 98138 Element 6284070 or 6139403 1 spare in the box ×2

Tubes and Hoses 2 pieces

Axle Hose, Soft 19L Black Part 32235 Element 6139205 or 4121650 ×2

Minifig Accessories 1 piece

Equipment Hose Nozzle / Gun with Side String Hole Simplified Black Part 60849 Element 6641462 or 4537551 1 spare in the box ×1

Minifig Shields, Weapons, & Tools 1 piece

Weapon Harpoon [Smooth Shaft] Flat Silver Part 18041 Element 6162578 or 6078471 1 spare in the box ×1

Transportation - Land 1 piece

Wheel Arch, Mudguard 2 x 3 x 1 1/3 with 2 x 2 Plate Black Part 49097 Element 6255875 ×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

42228 McLaren MCL39 F1 Car

Before you call it missing

Look-alike colors in this set

Your missing list

Piece checklist

Technic Pins 614 pieces

Technic Connectors 240 pieces

Technic Beams 237 pieces

Technic Axles 184 pieces

Technic Panels 144 pieces