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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

42115 Lamborghini Sián FKP 37

3,696 pieces in 295 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. 15 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 22 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 Connector Smooth [with x Hole + Orientation] Black ×20 Dark Bluish Gray ×9 Black is darker than Dark Bluish Gray.
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 3L with 2 Pin Holes Black ×43 Dark Bluish Gray ×4 Black is darker than Dark Bluish Gray.
Technic Beam 1 x 11 Thick Black ×6 Dark Bluish Gray ×7 Black is darker than Dark Bluish Gray.
Technic Beam 1 x 11.5 Double Bent Thick Black ×11 Dark Bluish Gray ×4 Black is darker than Dark Bluish Gray.
Technic Beam 1 x 15 Thick Black ×28 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.

9 more look-alike pairs

Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Black ×73 Dark Bluish Gray ×4 Black is darker than Dark Bluish Gray.
Technic Beam 1 x 3 Thin Black ×28 Dark Bluish Gray ×12 Black is darker than Dark Bluish Gray.
Technic Beam 1 x 4 Thin Black ×4 Dark Bluish Gray ×4 Black is darker than Dark Bluish Gray.
Technic Beam 1 x 7 Thick Black ×11 Dark Bluish Gray ×10 Black is darker than Dark Bluish Gray.
Technic Beam 2 x 4 L-Shape Thick Black ×16 Dark Bluish Gray ×17 Black is darker than Dark Bluish Gray.
Technic Panel Curved 7 x 3 with 2 Pin Holes through Panel Surface Black ×1 Dark Bluish Gray ×3 Black is darker than Dark Bluish Gray.
Technic Panel Fairing #21 5L Small Smooth, Side B Black ×8 Dark Bluish Gray ×4 Black is darker than Dark Bluish Gray.
Technic Panel Fairing #22 5L Small Smooth, Side A Black ×8 Dark Bluish Gray ×4 Black is darker than Dark Bluish Gray.
Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge] Black ×19 Dark Bluish Gray ×14 Black is darker than Dark Bluish Gray.

Piece checklist

Technic Bushes 44 pieces

Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 2 spares in the box ×38
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 1 spare in the box ×6

Bricks Sloped 34 pieces

Brick Sloped 45° 2 x 1 with 2/3 Cutout [New Version] Black Part 15672 Element 6069000 or 4653087 ×6
Brick Sloped 45° 2 x 1 with 2/3 Inverted Cutout and no stud Black Part 28192 Element 6267487 ×6
Brick Sloped 45° 2 x 1 with Bottom Pin Black Part 3040b Element 4121966 or 304026 ×2
Brick Sloped 65° 2 x 1 x 2 Black Part 60481 Element 4515373 ×4
Brick Sloped 45° 2 x 1 with 2/3 Cutout [New Version] Lime Part 15672 Element 6170559 or 6069166 ×4
Brick Sloped Double 45° 1 x 1 Red Part 35464 Element 6224794 1 spare in the box ×12

Technic Beams Special 33 pieces

Technic Beam 3 x 0.5 Liftarm with Boss and Blocked, Squared Pin Hole Black Part 61408 Element 6313520 ×6
Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick Black Part 64179 Element 6016154 ×7
Technic Beam Frame 7 x 11 Black Part 39794 Element 6265643 ×3
Technic Beam Frame 11 x 15 Dark Bluish Gray Part 39790 Element 6265646 ×3
Technic Beam 3 x 0.5 Liftarm with Boss and Blocked, Squared Pin Hole Light Bluish Gray Part 61408 Element 6331859 ×2
Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] Light Bluish Gray Part 14720 Element 6055519 ×8
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 ×3

Plates Special 32 pieces

Bracket 1 x 2 - 2 x 2 Black Part 44728 Element 6117973 or 6048855 ×4
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Black Part 15573 Element 6092585 ×2
Plate Special 1 x 2 with Pin Hole Underneath Black Part 18677 Element 6192309 or 6167497 ×5
Plate Special 1 x 2 with Pin Hole on Top Black Part 11458 Element 6114987 ×4
Plate Special 4 x 6, Studs on 3 Edges with 'Lamborghini Sian' Print Black Part 6180pr0009 Element 6302573 ×1
Plate Special 1 x 2 with Pin Hole Underneath Light Bluish Gray Part 18677 Element 6168633 or 6089147 ×4
Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] Red Part 4081b Element 6281994 or 4632572 ×6
Plate Special 1 x 2 Side Handle [Free Ends] Red Part 2540 Element 4140585 or 254021 ×4
Plate Special 1 x 2 with Pin Hole on Top White Part 11458 Element 6632146 or 6057414 ×2

Tubes and Hoses 29 pieces

Axle Hose, Soft 12L Black Part 32200 Element 4501290 or 4121647 ×2
Axle Hose, Soft 19L Black Part 32235 Element 6139205 or 4121650 ×3
Axle Hose, Soft 7L Black Part 32580 Element 6132744 ×6
Hose, Ribbed 7mm D. 3L / 2.4cm Flat Silver Part 78c03 Element 6420614 or 6116017 ×2
Axle Hose, Soft 12L Lime Part 32200 Element 6303394 or 4263148 ×3
Axle Hose, Soft 16L Lime Part 32202 Element 6303399 or 6149976 ×2
Axle Hose, Soft 19L Lime Part 32235 Element 6305373 ×8
Axle Hose, Soft 7L Lime Part 32580 Element 6308241 ×3

Technic Special 20 pieces

Technic Tooth 1 x 3 with Axle Hole [Hollow Underside] Black Part 48267 Element 6288220 ×6
Technic Tooth 1 x 3 with Axle Hole [Hollow Underside] Lime Part 48267 Element 6322197 ×11
Technic Changeover Catch - New Style Red Part 51149 Element 6313493 ×1
Technic Link 1 x 16 Red Part 2637 Element 6212053 or 4106933 ×2

Bars, Ladders and Fences 16 pieces

Bar 1L with Clip [Cut Edges and One Side Hole] [Gap in Clip] Black Part 48729b Element 6278152 or 6037347 1 spare in the box ×4
Bar 3L Bright Green Part 87994 Element 6161772 1 spare in the box ×4
Bar 4L (Lightsaber Blade / Wand) White Part 30374 Element 6116602 or 4129836 ×2
Bar 6L with Stop Ring White Part 63965 Element 6170419 or 6081986 ×6

Bricks Curved 16 pieces

Brick Curved 2 x 1 No Studs [1/2 Bow] Light Bluish Gray Part 11477 Element 6028813 ×2
Brick Curved 2 x 1 No Studs [1/2 Bow] Lime Part 11477 Element 6069006 ×4
Brick Curved 2 x 4 x 2/3 No Studs, with Bottom Tubes Lime Part 88930 Element 6075049 or 4597561 ×2
Brick Curved 4 x 1 No Studs [Stud Holder with Symmetric Ridges] Lime Part 11153 Element 6578745 or 6033782 ×4
Brick Curved 4 x 1 Double, No Studs with 'Lamborghini' Print Red Part 93273pr0017 Element 6302569 ×4

Wheels and Tyres 13 pieces

Tyre 81.6 x 44 ZR Technic Straight Tread Black Part 23799 Element 6139227 ×4
Wheel 11 x 8 with Center Groove Light Bluish Gray Part 42610 Element 4211758 ×5
Wheel 62.3 x 42 Lamborghini Metallic Gold Part 68577 Element 6306718 ×4

Bricks Round and Cones 12 pieces

Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end Light Bluish Gray Part 25214 Element 6151349 ×12

Tiles Round and Curved 9 pieces

Tile Round 1 x 1 Black Part 98138 Element 6284070 or 6139403 1 spare in the box ×4
Tile Round 1 x 1 with Lamborghini Symbol Print Black Part 98138pr0161 Element 6323635 2 spares in the box ×5

Technic Bricks 7 pieces

Technic Brick 1 x 2 [1 Pin Hole] Black Part 3700 Element 370026 ×1
Technic Brick 1 x 6 [5 Pin Holes] Black Part 3894 Element 389426 ×4
Technic Pin Connector Block 1 x 5 x 3 Black Part 32333 Element 6271358 or 4141810 ×2

String, Bands and Reels 5 pieces

String with End Studs 11L Overall Black Part 14226c11 Element 6096955 or 6037558 ×2
Rubber Belt Small [15mm ID] [Round Cross Section] White Part 85543 Element 6699001 or 4580665 ×2
Technic Rubber Belt Large [33mm ID] [Round Cross Section] Yellow Part 85546 Element 4544151 or 70905 ×1

Minifig Upper Body 4 pieces

Arm Skeleton [Bent / 2 Clips] Dark Bluish Gray Part 93609 Element 6318697 or 6167900 ×4

Tiles Special 2 pieces

Tile Special 2 x 2 Corner with Cut Corner - Facet Black Part 27263 Element 6166859 ×2

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

42115 Lamborghini Sián FKP 37

Before you call it missing

Look-alike colors in this set

Your missing list

Piece checklist

Technic Pins 1,338 pieces

Technic Beams 757 pieces

Technic Connectors 550 pieces

Technic Axles 356 pieces

Technic Panels 132 pieces

Technic Steering, Suspension and Engine 96 pieces

Technic Gears 78 pieces

Plates 66 pieces