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 Axle Connector Smooth [with x Hole + Orientation]Black ×9Dark Bluish Gray ×6Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Angled #2 - 180°Black ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Angled #6 - 90°Black ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Perpendicular 3L with 2 Pin HolesBlack ×8Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Beam 1 x 11 ThickBlack ×7Dark Bluish Gray ×7Black is darker than Dark Bluish Gray.
Technic Beam 1 x 13 ThickBlack ×6Dark Bluish Gray ×3Black is darker than Dark Bluish Gray.
19 more look-alike pairs
Technic Beam 1 x 2 Thick with Pin Hole and Axle HoleBlack ×6Dark Bluish Gray ×12Black is darker than Dark Bluish Gray.
Technic Beam 1 x 2 ThinBlack ×10Dark Bluish Gray ×8Black is darker than Dark Bluish Gray.
Technic Beam 1 x 3 ThickBlack ×4Dark Bluish Gray ×9Black is darker than Dark Bluish Gray.
Technic Beam 1 x 5 ThickBlack ×7Dark Bluish Gray ×3Black is darker than Dark Bluish Gray.
Technic Beam 1 x 7 ThickBlack ×16Dark Bluish Gray ×6Black is darker than Dark Bluish Gray.
Technic Beam 2 x 4 L-Shape ThickBlack ×28Dark Bluish Gray ×16Black is darker than Dark Bluish Gray.
Technic Beam 3 x 3 T-Shape ThickBlack ×2Dark Bluish Gray ×8Black is darker than Dark Bluish Gray.
Technic Beam 3 x 5 L-Shape ThickBlack ×8Dark Bluish Gray ×10Black is darker than Dark Bluish Gray.
Technic Panel 3 x 11 x 1Black ×3Dark Bluish Gray ×3Black is darker than Dark Bluish Gray.
Technic Panel 3 x 2 x 5Black ×1Dark Bluish Gray ×3Black is darker than Dark Bluish Gray.
Technic Panel 3 x 7 x 1Black ×6Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Panel 5 x 11 x 1Black ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Panel Fairing #21 5L Small Smooth, Side BBlack ×6Dark Bluish Gray ×11Black is darker than Dark Bluish Gray.
Technic Panel Fairing #22 5L Small Smooth, Side ABlack ×6Dark Bluish Gray ×11Black is darker than Dark Bluish Gray.
Technic Panel Fairing 2 x 3 x 1Black ×15Dark Bluish Gray ×9Black is darker than Dark Bluish Gray.
Technic Pin Connector Hub with 1 AxleBlack ×4Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge]Black ×18Dark Bluish Gray ×15Black is darker than Dark Bluish Gray.
Technic Pin Connector Hub with 2 AxlesBlack ×2Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Pin Connector Round 1L [Beam]Black ×14Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Gear Rack 1 x 13 with Axle and Pin HolesBlackPart 64781Element 6302830 or 4540906×1
Technic Link 1 x 6 without StoppersBlackPart 32005aElement 4629921 or 4530733×2
Technic Panel 3 x 11 x 1BlackPart 15458Element 6080356Also in Dark Bluish Gray×3
Technic Panel 3 x 2 x 5BlackPart 80285Element 6399568Also in Dark Bluish Gray×1
Technic Panel 3 x 7 x 1BlackPart 71709Element 6331935Also in Dark Bluish Gray×6
Technic Panel 5 x 11 x 1BlackPart 64782Element 4566243Also in Dark Bluish Gray×2
Technic Panel 5 x 11 x 1 TaperedBlackPart 18945Element 6164383×2
Technic Panel Car Mudguard 13 x 2 x 5BlackPart 71689Element 6358257×1
Technic Panel Curved 11 x 3 with 10 Pin Holes through Panel SurfaceBlackPart 11954Element 6031916×1
Technic Panel Curved 5 x 13 x 2 Tapered, Left #50BlackPart 67142Element 6472644 or 6390391×1
Technic Panel Curved 5 x 13 x 2 Tapered, Right #51BlackPart 68196Element 6472641 or 6390393×1
Technic Panel Curved and Bent 6 x 3BlackPart 24116Element 6268012 or 6133246×4
Technic Panel Curved and Bent Angled Left 5 x 4 x 3 #71BlackPart 80272Element 6362555×1
Technic Panel Curved and Bent Angled Right 5 x 4 x 3 #70BlackPart 80271Element 6362554×1
Technic Panel Fairing #1 Small Smooth Short, Side ABlackPart 87080Element 4566251×1
Technic Panel Fairing #2 Small Smooth Short, Side BBlackPart 87086Element 4566249×1
Technic Panel Fairing #21 5L Small Smooth, Side BBlackPart 11946Element 6316923 or 6023036Also in Dark Bluish Gray×6
Technic Panel Fairing #22 5L Small Smooth, Side ABlackPart 11947Element 6319983 or 6022761Also in Dark Bluish Gray×6
Technic Panel Fairing #7 3L Very Small Smooth, Side ABlackPart 2387Element 6510991 or 6426589×1
Technic Panel Fairing #8 3L Very Small Smooth, Side BBlackPart 2389Element 6513874 or 6426590×1
Technic Panel Fairing 2 x 1 x 1BlackPart 89679Element 6396456×2
Technic Panel Fairing 2 x 3 x 1BlackPart 71682Element 6331026Also in Dark Bluish Gray×15
Technic Pin Connector Hub with 1 AxleBlackPart 22961Element 6253260Also in Dark Bluish Gray×4
Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge]BlackPart 65487Element 6282140Also in Dark Bluish Gray×18
Technic Pin Connector Hub with 2 AxlesBlackPart 27940Element 6396457Also in Dark Bluish Gray×2
Technic Pin Connector Hub with 2 Perpendicular AxlesBlackPart 10197Element 6099801 or 6098801×4
Technic Pin Connector Perpendicular 2 x 2 BentBlackPart 44809Element 6325982 or 4480926×2
Technic Axle 4RedPart 3705Element 6129995 or 4265797×6
Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L AxleRedPart 11214Element 6209519×32
Technic Axle and Pin Connector PerpendicularRedPart 6536Element 6261373 or 4188298×12
Technic BushRedPart 3713Element 6271820 or 42271551 spare in the box×5
Technic Panel Fairing 2 x 3 x 1RedPart 71682Element 6381442×12
Technic Pin 1/2 with FrictionRedPart 89678Element 63781202 spares in the box×13
Technic Pin Connector Round [Slotted]RedPart 62462Element 6173126 or 4526984×2
Technic Pin with Friction Ridges Lengthwise and Towball - Round Pin HoleRedPart 66906Element 6360104×13
Lime
49 pieces
Brick Curved 2 x 1 No Studs [1/2 Bow]LimePart 11477Element 6069006×4
Brick Curved 2 x 2 x 2/3LimePart 15068Element 6138661×1
Plate 1 x 1LimePart 3024Element 4621557 or 45614801 spare in the box×1
Plate 1 x 3LimePart 3623Element 4534664 or 4271564×1
Technic Axle and Pin Connector Angled #1LimePart 32013Element 6332867 or 6150003×2
Technic Axle and Pin Connector Angled #2 - 180°LimePart 32034Element 6351581 or 6308248×3
Technic Axle and Pin Connector Perpendicular 3L with 2 Pin HolesLimePart 42003Element 6273728 or 6211876×3
Technic Beam 1 x 2 Thick with Pin Hole and Axle HoleLimePart 60483Element 6344866 or 6307436×2
Technic Beam 1 x 5 ThickLimePart 32316Element 4661486 or 4571220×1
Technic Beam 1 x 7 ThickLimePart 32524Element 6308236 or 4495928×5
Technic Beam 2 x 4 L-Shape ThickLimePart 32140Element 6271826 or 4140345×4
Technic Beam Frame 7 x 11LimePart 39794Element 6247432×1
Technic Brick 1 x 1 with Pin HoleLimePart 6541Element 6310282 or 6123745×4
Technic Panel Fairing #21 5L Small Smooth, Side BLimePart 11946Element 6340657 or 6218483×1
Technic Panel Fairing #22 5L Small Smooth, Side ALimePart 11947Element 6352667 or 6218484×1
Technic Pin Connector Round 1L [Beam]LimePart 18654Element 63027411 spare in the box×15
Orange
34 pieces
Technic Pin Connector Perpendicular 2 x 4 Bent - Beam with 90 Hole Ø 4.8OrangePart 11455Element 6370447×2
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole]OrangePart 65304Element 6347790×32
Tan
28 pieces
Technic Axle 4 with Centre StopTanPart 99008Element 4666999×2
Technic Axle Pin without Friction Ridges LengthwiseTanPart 3749Element 4666579 or 4186017×7
Technic Engine Crankshaft CenterTanPart 2854Element 6355727 or 6013937×2
Technic Gear 12 Tooth BevelTanPart 6589Element 4565452 or 4514556×9
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening]TanPart 18575Element 6346517 or 6084724×2
Technic Pin 3/4TanPart 32002Element 6663097 or 60139381 spare in the box×4
Technic Pin Long without Friction Ridges, with Anti-Roll NotchTanPart 39888Element 6321305×2
Yellow
27 pieces
Technic Axle 5YellowPart 32073Element 6130008×13
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedYellowPart 32123bElement 6271167 or 32123241 spare in the box×6
Technic Engine CrankshaftYellowPart 2853Element 6640378 or 4119474×2
Technic Engine Piston RoundYellowPart 2851Element 4112203 or 285124×6
Reddish Brown
13 pieces
Technic Axle 3 with StopReddish BrownPart 24316Element 6135494×7
Technic Axle 5 with StopReddish BrownPart 15462Element 6159763×6
Glow in Dark White
6 pieces
Bar 4L (Lightsaber Blade / Wand)Glow in Dark WhitePart 30374Element 6384681 or 6009094×6
Trans-Clear
6 pieces
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)Trans-ClearPart 54200Element 6245250 or 42443621 spare in the box×6
White
3 pieces
Technic Axle Pin 3L without Friction Ridges and 2L AxleWhitePart 65249Element 6289797×3
[No Color/Any Color]
2 pieces
Sticker Sheet 1 for Set 42156-1[No Color/Any Color]Part 10105229Element 6461449×1
Sticker Sheet 2 for Set 42156-1[No Color/Any Color]Part 10104257Element 6443413×1
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.