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.
Brick Curved 2 x 1 No Studs [1/2 Bow]Black ×1Dark Blue ×1Black is yellower and darker than Dark Blue.
Technic Axle and Pin Connector Angled #2 - 180°Black ×2Dark Blue ×1Black is yellower and darker than Dark Blue.
Technic Panel Fairing 2 x 1 x 1Black ×2Dark Blue ×1Black is yellower and darker than Dark Blue.
Technic Axle Connector Smooth [with x Hole + Orientation]Black ×2Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Angled #1Black ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Beam 1 x 7 ThickBlack ×1Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
1 more look-alike pair
Technic Pin Connector Hub with 2 Perpendicular AxlesBlack ×2Dark Bluish Gray ×7Black is darker than Dark Bluish Gray.
Technic Axle Pin 3L without Friction Ridges and 2L AxleWhitePart 65249Element 6289797×2
Technic Axle and Pin Connector Angled #1WhitePart 32013Element 6332573 or 4118981×2
Technic Axle and Pin Connector Perpendicular 3L with 2 Pin HolesWhitePart 42003Element 6330960 or 6254109×4
Technic Axle and Pin Connector Perpendicular DoubleWhitePart 32291Element 6292916 or 6254266×6
Technic Beam 1 x 11 ThickWhitePart 32525Element 6028103 or 4296265×1
Technic Beam 1 x 2 ThinWhitePart 41677Element 6371416 or 4163533×2
Technic Beam 1 x 3 ThickWhitePart 32523Element 6632140 or 4208160×2
Technic Beam 2 x 4 L-Shape ThickWhitePart 32140Element 6271824 or 4118980×4
Technic Beam 2 x 5 L-Shape with Quarter Ellipse ThickWhitePart 80286Element 6598916×2
Technic Beam 3 x 3 T-Shape ThickWhitePart 60484Element 6632149 or 6402262×2
Technic Panel Fairing 2 x 1 x 1WhitePart 89679Element 6434569×2
Technic Panel Fairing 2 x 3 x 1WhitePart 71682Element 6334548×3
Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge]WhitePart 65487Element 6282148×4
Technic Pin Connector Round 1L [Beam]WhitePart 18654Element 6550155 or 6177114×2
Tan
22 pieces
Plate 1 x 1TanPart 3024Element 4159553 or 302405×6
Plate 1 x 2TanPart 3023Element 4113917 or 302305×2
Plate 1 x 6TanPart 3666Element 4124067 or 366605×1
Plate 2 x 6TanPart 3795Element 4113993 or 379505×1
Technic Gear 12 Tooth BevelTanPart 6589Element 4565452 or 4514556×5
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening]TanPart 18575Element 6346517 or 6084724×1
Technic Pin 3/4TanPart 32002Element 6663097 or 6013938×6
Yellow
21 pieces
Technic Axle 5YellowPart 32073Element 6130008×3
Technic Axle 9YellowPart 60485Element 6130010×1
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin HoleYellowPart 32184Element 6276974 or 6037676×5
Technic Axle and Pin Connector Toggle Joint SmoothYellowPart 32126Element 6469823×2
Technic Pin without Friction Ridges LengthwiseYellowPart 3673Element 6331822×2
Technic PistonYellowPart 4369Element 6452846×8
Lime
11 pieces
Technic Axle and Pin Connector Perpendicular 3L with 2 Pin HolesLimePart 42003Element 6273728 or 6211876×9
Technic Beam 1 x 2 Thick with Pin Hole and Axle HoleLimePart 60483Element 6344866 or 6307436×2
Dark Blue
10 pieces
Brick Curved 2 x 1 No Studs [1/2 Bow]Dark BluePart 11477Element 6554198 or 6094143Also in Black×1
Technic Axle 3.5 with StopDark BluePart 8168Element 6601618×6
Technic Axle and Pin Connector Angled #2 - 180°Dark BluePart 32034Element 6598920Also in Black×1
Technic Beam 2 x 5 L-Shape with Quarter Ellipse ThickDark BluePart 80286Element 6434566×1
Technic Panel Fairing 2 x 1 x 1Dark BluePart 89679Element 6434570Also in Black×1
Medium Azure
5 pieces
Plate 1 x 3Medium AzurePart 3623Element 6119107 or 6013829×5
Reddish Brown
5 pieces
Technic Axle 3 with StopReddish BrownPart 24316Element 6135494×1
Technic Axle 5 with StopReddish BrownPart 15462Element 6159763×4
Trans-Red
4 pieces
Equipment Cup / Teacup Saucer with Recessed Stud on Top [Plain]Trans-RedPart 38799Element 6534874×4
Bright Green
2 pieces
Technic Pin 1/2 with Anti-StudBright GreenPart 65826Element 6301284×2
Dark Tan
2 pieces
Technic Axle 4.5 with StopDark TanPart 7784Element 6569661×2
[No Color/Any Color]
1 piece
Sticker Sheet for Set 42235-1[No Color/Any Color]Part 10115273Element 6580550×1
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.