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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

42224 Porsche 911 GT3 R REXY AO Racing Car

1,313 pieces in 208 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. 7 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 29 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 #3 - 157.5° Black ×2 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Perpendicular Black ×2 Dark Bluish Gray ×4 Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Black ×6 Dark Bluish Gray ×17 Black is darker than Dark Bluish Gray.
Technic Beam 1 x 2 Thin Black ×12 Dark Bluish Gray ×12 Black is darker than Dark Bluish Gray.
Technic Beam 1 x 5 Thick Black ×4 Dark Bluish Gray ×5 Black is darker than Dark Bluish Gray.
Technic Beam 2 x 4 L-Shape Thick Black ×3 Dark Bluish Gray ×6 Black is darker than Dark Bluish Gray.

1 more look-alike pair

Technic Pin Connector Round 1L [Beam] Black ×5 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.

Piece checklist

Technic Bushes 28 pieces

Technic Bush Black Part 3713 Element 6332148 or 6210506 1 spare in the box ×2
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 3 spares in the box ×17
Technic Bush Red Part 3713 Element 6271820 or 4227155 1 spare in the box ×9

Technic Beams Special 21 pieces

Technic Beam 1 x 2 with Axle on Side Black Part 7244 Element 6542617 ×2
Technic Beam Frame 3 x 19 with 2 Center Cross Beams, 3 Openings Thick Black Part 67491 Element 6377025 ×2
Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick Black Part 64179 Element 6016154 ×2
Technic Beam 2 x 3 Thick [90° Offset Centre Beam Hole] Dark Bluish Gray Part 3167 Element 6475314 ×2
Technic Beam 3 x 0.5 Liftarm with Boss and Blocked, Squared Pin Hole Light Bluish Gray Part 61408 Element 6331859 ×11
Technic Beam 5 x 11 with 3 x 5 Opening Frame Thick Light Bluish Gray Part 64178 Element 4540797 ×2

Technic Gears 17 pieces

Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×2
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] Black Part 18575 Element 6346535 or 6093977 ×2
Technic Gear Rack 1 x 7 with Axle and Pin Holes Black Part 87761 Element 6327430 or 4562009 ×1
Technic Gear 12 Tooth with Axle Hole Blue Part 69778 Element 6396479 ×2
Technic Gear 20 Tooth with Axle Hole [+ Opening] Dark Azure Part 69779 Element 6396480 ×1
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 16 Tooth Reinforced [New Style] Light Bluish Gray Part 94925 Element 4640536 ×3
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 ×2

Bars, Ladders and Fences 11 pieces

Antenna 1 x 4 with Flat Top Black Part 3957b Element 395726 ×1
Bar 3L Bright Green Part 87994 Element 6161772 1 spare in the box ×4
Bar 2L with Stop in Center Dark Bluish Gray Part 78258 Element 6350724 1 spare in the box ×2
Light Cover 1 x 1 Round with Internal Bar / Bionicle Barraki Eye Light Bluish Gray Part 58176 Element 6212288 1 spare in the box ×4

Plates 10 pieces

Plate 1 x 2 Black Part 3023 Element 302326 ×6
Plate 2 x 4 Black Part 3020 Element 302026 ×2
Plate 1 x 1 Red Part 3024 Element 302421 1 spare in the box ×2

Tiles Round and Curved 10 pieces

Tile Round 1 x 1 Bright Green Part 98138 Element 6353793 1 spare in the box ×2
Tile Round 1 x 1 Dark Bluish Gray Part 98138 Element 6284596 or 6222416 1 spare in the box ×6
Tile Round 1 x 1 Red Part 98138 Element 6284574 or 6063445 1 spare in the box ×2

Wheels and Tyres 8 pieces

Tyre 56 x 28 ZR Street Black Part 41897 Element 6518574 or 6035364 ×4
Wheel 43.2 x 26 Technic Racing Small with 6 Pinholes Bright Green Part 56908 Element 6584475 ×4

Plates Special 6 pieces

Plate Special 1 x 2 with Pin Hole on Top Black Part 11458 Element 6114987 ×4
Plate Special 1 x 2 with Pin Hole on Top Red Part 11458 Element 6099736 ×2

Technic Bricks 5 pieces

Technic Brick 1 x 1 with Axle Hole Black Part 73230 Element 6344819 ×5

Bricks Curved 4 pieces

Brick Curved 2 x 2 x 2/3 Black Part 15068 Element 6053077 ×2
Brick Curved 2 x 1 No Studs [1/2 Bow] Red Part 11477 Element 6029946 ×2

Plates Round Curved and Dishes 4 pieces

Plate Special 1 x 2 Rounded with 2 Open Studs Black Part 35480 Element 6210270 ×1
Disc Oval 4 x 6 Trans-Clear Part 7688 Element 6564902 ×2
Plate Round 1 x 1 with Solid Stud Trans-Clear Part 6141 Element 6514052 or 6240030 1 spare in the box ×1

Tiles Special 4 pieces

Tile Special Round 1 x 1 with Hollow Bar Black Part 20482 Element 6186675 or 6167933 1 spare in the box ×4

Tiles 3 pieces

Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×1
Tile 2 x 6 Black Part 69729 Element 6318582 ×1
Tile 1 x 1 with Groove Trans-Red Part 3070b Element 6581817 or 6254248 1 spare in the box ×1

Tubes and Hoses 3 pieces

Axle Hose, Soft 12L Bright Green Part 32200 Element 6588036 ×2
Axle Hose, Soft 16L Red Part 32202 Element 6590349 or 4566049 ×1

Bricks Round and Cones 2 pieces

Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end Pearl Titanium Part 25214 Element 6156875 ×2

Hinges, Arms and Turntables 2 pieces

Hinge Brick 2 x 2 Top Plate Thin Black Part 6134 Element 4124096 or 613426 ×2

Stickers 2 pieces

Sticker Sheet 1 for Set 42224-1 [No Color/Any Color] Part 10115254 Element 6580427 ×1
Sticker Sheet 2 for Set 42224-1 [No Color/Any Color] Part 10116185 Element 6591840 ×1

Technic Special 1 piece

Technic Ball Joint Red Part 32474 Element 4290714 or 4178640 ×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

42224 Porsche 911 GT3 R REXY AO Racing Car

Before you call it missing

Look-alike colors in this set

Your missing list

Piece checklist

Technic Pins 450 pieces

Technic Connectors 267 pieces

Technic Beams 212 pieces

Technic Axles 133 pieces

Technic Panels 77 pieces