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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

42240 Aston Martin Aramco AMR25 F1 Car

1,547 pieces in 249 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. 10 parts in this set come in two colors that are easy to mix up; they are listed below.
The spare pieces. Many sets include a few extra small pieces. Check them before you order a replacement.
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 ×3 Dark Bluish Gray ×3 Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Perpendicular Black ×6 Dark Bluish Gray ×6 Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Black ×11 Dark Bluish Gray ×11 Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Black ×6 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
Technic Beam 1 x 3 Thin Black ×2 Dark Bluish Gray ×16 Black is darker than Dark Bluish Gray.
Technic Beam 1 x 5 Thick Black ×4 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.

4 more look-alike pairs

Technic Beam 1 x 5 Thin with Axle Holes on Ends Black ×1 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
Technic Beam 2 x 3 L-Shape with Quarter Ellipse Thick Black ×3 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
Technic Beam 3 x 3 T-Shape Thick Black ×2 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
Technic Pin Connector Round 1L [Beam] Black ×10 Dark Bluish Gray ×6 Black is darker than Dark Bluish Gray.

Piece checklist

Technic Bushes 24 pieces

Technic Bush Black Part 3713 Element 6332148 or 6210506 ×6
Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 ×1
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 ×17

Technic Beams Special 19 pieces

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 Beam 2 x 3 Thick [90° Offset Centre Beam Hole] Dark Bluish Gray Part 3167 Element 6475314 ×1
Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] Dark Bluish Gray Part 14720 Element 6396959 ×3
Technic Pin Connector Double with Bar [2 Holes] Green Part 85940 Element 6619974 ×1
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

Wheels and Tyres 13 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 Yellow Stripes Print Black Part 4472pr0003 Element 6580454 ×4
Wheel 11 x 11 with Pin Hole, Stud Light Bluish Gray Part 5806 Element 6575704 ×1

Plates Round Curved and Dishes 11 pieces

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×1
Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Black Part 2654 Element 4617551 or 4278359 ×1
Plate Special 1 x 2 Rounded with 2 Open Studs Black Part 35480 Element 6210270 ×5
Plate Round 1 x 1 with Solid Stud Flat Silver Part 6141 Element 4633691 ×4

Bricks Curved 6 pieces

Brick Curved 2 x 1 No Studs [1/2 Bow] Black Part 11477 Element 6047276 ×3
Brick Curved 2 x 1 No Studs [1/2 Bow] Green Part 11477 Element 6047426 ×2
Brick Curved 4 x 2 No Studs Green Part 93606 Element 6285601 or 6100244 ×1

Technic Special 6 pieces

Technic Rotor Blade Small with Hole and Axle Connector End Black Part 99012 Element 6442361 ×5
Technic Changeover Catch - New Style Red Part 51149 Element 6313493 ×1

Tiles 6 pieces

Tile 1 x 6 with Groove Black Part 6636 Element 663626 ×2
Tile 1 x 8 with Groove Black Part 4162 Element 416226 ×2
Tile 1 x 4 with Groove Trans-Red Part 2431 Element 6510184 or 6390369 ×2

Bricks Round and Cones 5 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 ×2
Dome 1 x 1 x 2/3 Black Part 6908 Element 6560654 ×1
Brick Round 2 x 2 [Grill] Light Bluish Gray Part 92947 Element 4650645 or 4610816 ×2

Hinges, Arms and Turntables 4 pieces

Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 7 Teeth Black Part 57360 Element 6271535 ×2
Hinge Plate 1 x 2 Locking with 1 Finger On End, without Groove Black Part 44301b Element 6266224 ×2

Plates 4 pieces

Plate 1 x 3 Black Part 3623 Element 362326 ×1
Plate 1 x 1 Green Part 3024 Element 302428 ×2
Plate 2 x 3 Green Part 3021 Element 302128 ×1

Plates Special 3 pieces

Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Green Part 15573 Element 6092586 ×2
Plate Special 1 x 3 with 2 Studs with Groove and Inside Stud Holder (Jumper) Light Bluish Gray Part 34103 Element 6211969 ×1

Technic Bricks 3 pieces

Technic Brick 1 x 1 with Axle Hole White Part 73230 Element 6345886 ×3

Tiles Round and Curved 3 pieces

Tile Round 1 x 1 Black Part 98138 Element 6284070 or 6139403 ×1
Tile Round 1 x 1 Half Circle Trans-Red Part 24246 Element 6507960 or 6264033 ×2

Bars, Ladders and Fences 2 pieces

Bar 4L (Lightsaber Blade / Wand) Trans-Red Part 30374 Element 6507880 or 6167284 ×2

Stickers 2 pieces

Sticker Sheet 1 for Set 42240-1 [No Color/Any Color] Part 10115275 Element 6580552 ×1
Sticker Sheet 2 for Set 42240-1 [No Color/Any Color] Part 10117273 Element 6603268 ×1

Tiles Special 2 pieces

Tile Special 1 x 2 Grille with Bottom Groove Black Part 2412b Element 241226 ×1
Tile Special Round 2 x 2 with Hole Black Part 15535 Element 6143850 ×1

Tubes and Hoses 2 pieces

Axle Hose, Soft 16L Black Part 32202 Element 6057525 or 4121649 ×1
Axle Hose, Soft 19L Green Part 32235 Element 6624363 ×1

Bricks 1 piece

Brick 1 x 2 Black Part 3004 Element 300426 ×1

Bricks Special 1 piece

Brick Special 1 x 1 with Stud on 1 Side Black Part 87087 Element 4558954 ×1

Minifig Shields, Weapons, & Tools 1 piece

Weapon Harpoon [Smooth Shaft] Flat Silver Part 18041 Element 6162578 or 6078471 ×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

42240 Aston Martin Aramco AMR25 F1 Car

Before you call it missing

Look-alike colors in this set

Your missing list

Piece checklist

Technic Pins 561 pieces

Technic Beams 258 pieces

Technic Axles 189 pieces

Technic Connectors 183 pieces

Technic Panels 154 pieces