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.
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
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 1 x 9 ThickBlack ×6Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Brick 1 x 2 [2 Pin Holes]RedPart 32000Element 4179355 or 4101764×3
Technic Brick 1 x 4 [3 Pin Holes]RedPart 3701Element 370121×2
Technic BushRedPart 3713Element 6271820 or 42271552 spares in the box×29
Technic Gear 16 Tooth with Clutch on Both SidesRedPart 18946Element 6100930×2
Technic Pin with Friction Ridges Lengthwise and Towball - Round Pin HoleRedPart 66906Element 6360104×2
Tile 1 x 2 with GrooveRedPart 3069bElement 4178178 or 306921×4
White
89 pieces
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin HoleWhitePart 32184Element 6276981 or 6114940×17
Technic Beam 1 x 11 ThickWhitePart 32525Element 6028103 or 4296265×6
Technic Beam 1 x 13 ThickWhitePart 41239Element 6634561 or 4620671×4
Technic Beam 1 x 2 Thick with Pin Hole and Axle HoleWhitePart 60483Element 6265135 or 6177268×1
Technic Beam 1 x 3 ThickWhitePart 32523Element 6632140 or 4208160×3
Technic Beam 1 x 3 ThinWhitePart 6632Element 6360038 or 4107826×12
Technic Beam 1 x 5 ThickWhitePart 32316Element 4249021 or 4140465×3
Technic Beam 1 x 5 Thin with Axle Holes on EndsWhitePart 11478Element 6360069 or 6259826×6
Technic Beam 1 x 6 ThinWhitePart 32063Element 6345239 or 6170574×2
Technic Beam 1 x 7 ThickWhitePart 32524Element 6564912 or 6318056×8
Technic Beam 1 x 7 ThinWhitePart 32065Element 6271584 or 6176554×2
Technic Beam 2 x 4 L-Shape ThickWhitePart 32140Element 6271824 or 4118980×1
Technic Driving Ring ConnectorWhitePart 18948Element 6276052 or 6100932×2
Technic Panel 3 x 11 x 1WhitePart 15458Element 6055627×3
Technic Panel 5 x 11 x 1WhitePart 64782Element 6004135 or 4580019×3
Technic Panel Curved 11 x 3 with 2 Pin Holes through Panel SurfaceWhitePart 62531Element 6004137×1
Technic Panel Fairing #5 Long Smooth, Side AWhitePart 64681Element 4558802×1
Technic Panel Fairing #6 Long Smooth, Side BWhitePart 64393Element 4558797×1
Technic Pin Connector Hub with 1 AxleWhitePart 22961Element 6179606×2
Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge]WhitePart 65487Element 6282148×2
Technic Pin Connector Round 1L [Beam]WhitePart 18654Element 6550155 or 61771141 spare in the box×7
Technic Pin Connector Round [Slotted]WhitePart 62462Element 6550164 or 6173116×2
Orange
61 pieces
Brick Curved 2 x 1 No Studs [1/2 Bow]OrangePart 11477Element 6055069×2
Plate 1 x 4OrangePart 3710Element 4118782×2
Technic Axle and Pin Connector Perpendicular 3L with 2 Pin HolesOrangePart 42003Element 6330986 or 6259824×2
Technic Beam 1 x 11 ThickOrangePart 32525Element 6135085 or 4157377×1
Technic Beam 1 x 2 Thick with Pin Hole and Axle HoleOrangePart 60483Element 6265128 or 6057526×3
Technic Beam 1 x 3 ThickOrangePart 32523Element 6102618 or 4655127×4
Technic Beam 1 x 5 ThickOrangePart 32316Element 6143014 or 4142138×6
Technic Beam 1 x 7 ThickOrangePart 32524Element 6339024 or 6102621×4
Technic Beam 1 x 9 Bent (7 - 3) ThickOrangePart 32271Element 6353182 or 4657639×2
Technic Beam 1 x 9 ThickOrangePart 40490Element 6135086 or 4157376×12
Technic Beam 2 x 4 L-Shape ThickOrangePart 32140Element 6271832 or 4508664×5
Technic Beam 3 x 3 T-Shape ThickOrangePart 60484Element 6528012 or 6305545×6
Technic Panel 3 x 11 x 1OrangePart 15458Element 6339023 or 6102612×6
Technic Panel Car Mudguard Arched 9 x 2 x 3 #30OrangePart 42531Element 6249344×2
Technic Panel Fairing #21 5L Small Smooth, Side BOrangePart 11946Element 6340604 or 6022767×1
Technic Panel Fairing #22 5L Small Smooth, Side AOrangePart 11947Element 6352662 or 6286428×1
Technic Pin Connector Round [Slotted]OrangePart 62462Element 6173129 or 4538144×2
Tan
51 pieces
Technic Axle 4 with Centre StopTanPart 99008Element 4666999×5
Technic Axle Pin without Friction Ridges LengthwiseTanPart 3749Element 4666579 or 4186017×6
Technic Gear 12 Tooth BevelTanPart 6589Element 4565452 or 4514556×17
Technic Gear 20 Tooth BevelTanPart 32198Element 6031962 or 4514557×1
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening]TanPart 18575Element 6346517 or 6084724×11
Technic Pin 3/4TanPart 32002Element 6663097 or 60139381 spare in the box×8
Technic Pin Long without Friction Ridges, with Anti-Roll NotchTanPart 39888Element 6321305×3
Yellow
27 pieces
Pneumatic Cylinder 1 x 11 with 2 Stepped Inlets [V2]YellowPart 19476Element 6353188 or 6099775×2
Pneumatic Cylinder 2 x 11 with 2 Stepped Inlets [V2]YellowPart 19478Element 6156699 or 6152068×1
Technic Axle 5YellowPart 32073Element 6130008×13
Technic Axle 9YellowPart 60485Element 6130010×10
Technic Beam 1 x 2 ThickYellowPart 43857Element 4187122×1
Metallic Silver
22 pieces
Tile Special 1 x 2 Grille with Bottom GrooveMetallic SilverPart 2412bElement 6051422 or 4579833×22
Trans-Orange
19 pieces
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)Trans-OrangePart 54200Element 6245265 or 42443691 spare in the box×4
Cone 1 x 1 [Top Groove]Trans-OrangePart 59900Element 6514017 or 6172233×3
Tile 1 x 2 with GrooveTrans-OrangePart 3069bElement 6514225 or 6251306×6
Tile Round 1 x 1Trans-OrangePart 98138Element 6514197 or 62747471 spare in the box×6
Reddish Brown
15 pieces
Technic Axle 3 with StopReddish BrownPart 24316Element 6135494×7
Technic Axle 5 with StopReddish BrownPart 15462Element 6159763×8
Trans-Clear
6 pieces
Tile Round 1 x 1Trans-ClearPart 98138Element 6514191 or 62747381 spare in the box×6
Dark Tan
4 pieces
Technic Axle 3 with StudDark TanPart 6587Element 6031821 or 6013821×4
Trans-Dark Blue
2 pieces
Tile 1 x 2 with GrooveTrans-Dark BluePart 3069bElement 6514219 or 6251289×2
Trans-Red
2 pieces
Tile Round 1 x 1Trans-RedPart 98138Element 6514189 or 62586071 spare in the box×2
[No Color/Any Color]
1 piece
Sticker Sheet for Set 42128-1[No Color/Any Color]Part 77597Element 6338466×1
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.
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.