Missing Piece Checker: 42103 Dragster

Checking

42103 Dragster

225 pieces in 69 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. 1 part in this set come in two colors that are easy to mix up; they are listed below.
The spare pieces. This set comes with 11 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 Beam 3 x 5 L-Shape with Quarter Ellipse Thin Black ×2 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.

Piece checklist

Technic Pins 72 pieces

Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle Black Part 18651 Element 6089119 ×2
Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×12
Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×14
Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×32
Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 1 spare in the box ×5
Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 1 spare in the box ×2
Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Red Part 11214 Element 6209519 ×2
Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×1
Technic Pin 3/4 Tan Part 32002 Element 6663097 or 6013938 1 spare in the box ×2

Technic Axles 19 pieces

Technic Axle 4 with Stop Dark Bluish Gray Part 87083 Element 6083620 or 4560177 ×1
Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×8
Technic Axle 7 Light Bluish Gray Part 44294 Element 44294194 or 4211805 ×1
Technic Axle 2 Notched Red Part 32062 Element 4142865 ×4
Technic Axle 4 Red Part 3705 Element 6129995 or 4265797 ×2
Technic Axle 5 Yellow Part 32073 Element 6130008 ×2
Technic Axle 9 Yellow Part 60485 Element 6130010 ×1

Technic Panels 11 pieces

Technic Panel 3 x 11 x 1 Black Part 15458 Element 6080356 ×1
Technic Panel Fairing #21 5L Small Smooth, Side B Black Part 11946 Element 6316923 or 6023036 ×3
Technic Panel Fairing #22 5L Small Smooth, Side A Black Part 11947 Element 6319983 or 6022761 ×3
Technic Panel Fairing # 3 Small Smooth Long, Side A Lime Part 64683 Element 6004093 ×1
Technic Panel Fairing # 4 Small Smooth Long, Side B Lime Part 64391 Element 6004097 ×1
Technic Panel Fairing #5 Long Smooth, Side A Lime Part 64681 Element 6150000 ×1
Technic Panel Fairing #6 Long Smooth, Side B Lime Part 64393 Element 6149981 ×1

Tiles Round and Curved 11 pieces

Tile Round 1 x 1 with Gauge Print Light Bluish Gray Part 98138pr0186 Element 6329581 1 spare in the box ×1
Tile Round 1 x 1 Trans-Green Part 98138 Element 6514194 or 6274742 1 spare in the box ×2
Tile Round 1 x 1 Trans-Red Part 98138 Element 6514189 or 6258607 1 spare in the box ×2
Tile Round 1 x 1 Trans-Yellow Part 98138 Element 6514193 or 6274740 1 spare in the box ×6

Technic Bushes 10 pieces

Technic Bush Red Part 3713 Element 6271820 or 4227155 1 spare in the box ×2
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 1 spare in the box ×8

Wheels and Tyres 10 pieces

Technic Wedge Belt Wheel Tire Black Part 2815 Element 6028041 or 281526 ×2
Tyre 43.2 x 22 ZR Black Part 44309 Element 4184286 ×2
Wheel 30.4 x 20 without Pinholes, with Reinforced Rim Black Part 56145 Element 4299389 or 4284946 ×2
Wheel 11 x 8 with Center Groove Light Bluish Gray Part 42610 Element 4211758 ×2
Technic Wedge Belt Wheel [aka Pulley] White Part 4185 Element 6564907 or 6330136 ×2

Plates 7 pieces

Plate 1 x 2 Black Part 3023 Element 302326 ×3
Plate 1 x 4 Light Bluish Gray Part 3710 Element 4211445 ×2
Plate 1 x 8 Light Bluish Gray Part 3460 Element 4211425 ×2

Energy Effects 4 pieces

Wave / Flame Rounded with Base Rim Trans-Orange Part 6126b Element 6167741 or 4261397 ×4

Plates Special 4 pieces

Plate Special 1 x 2 with Pin Hole Underneath Black Part 18677 Element 6192309 or 6167497 ×4

Mechanical 1 piece

Pullback Motor 6 x 3 x 5 Dark Bluish Gray Part 12799 Element 6143751 or 6024100 ×1

Stickers 1 piece

Sticker Sheet for Set 42103-1 [No Color/Any Color] Part 65482 Element 6282036 ×1

Tiles 1 piece

Tile 2 x 3 Black Part 26603 Element 6162892 ×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

42103 Dragster

Before you call it missing

Look-alike colors in this set

Your missing list