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.
Tile 1 x 2 with GrooveWhite ×1Trans-Clear ×2Trans-Clear is see-through: hold the piece up to a light.
Technic Axle 1.5 with Perpendicular Axle Connector (Technic Pole Reverser Handle)Black ×2Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Gear Differential with Inner Tabs and Closed Center, 28 Bevel Teeth [Beveled Edge]Dark Bluish GrayPart 62821bElement 4562210 or 4525184×1
Yellow
25 pieces
Technic Axle 3YellowPart 4519Element 6130007×9
Technic Axle 7YellowPart 44294Element 6130009×1
Technic Axle and Pin Connector Angled #2 - 180°YellowPart 32034Element 6344325 or 6210804×2
Technic Beam 1 x 2 ThickYellowPart 43857Element 4187122×4
Technic Beam 1 x 5 ThinYellowPart 32017Element 4503425 or 4199343×1
Technic Engine CrankshaftYellowPart 2853Element 6640378 or 4119474×2
Technic PistonYellowPart 4369Element 6452846×6
Tan
22 pieces
Technic Axle Pin without Friction Ridges LengthwiseTanPart 3749Element 4666579 or 4186017×3
Technic Gear 12 Tooth BevelTanPart 6589Element 4565452 or 4514556×4
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 60139381 spare in the box×14
Lime
7 pieces
Plate Special 1 x 2 Rounded with 2 Open StudsLimePart 35480Element 6264062×1
Technic Beam 1 x 3 ThickLimePart 32523Element 6170474 or 4265684×1
Technic Pin Connector Round 1L [Beam]LimePart 18654Element 63027411 spare in the box×5
Green
4 pieces
Plate 1 x 2GreenPart 3023Element 302328×2
Technic Axle Connector Smooth [with x Hole + Orientation]GreenPart 59443Element 6374076 or 4654508×2
Reddish Brown
4 pieces
Technic Axle 3 with StopReddish BrownPart 24316Element 6135494×2
Technic Axle 5 with StopReddish BrownPart 15462Element 6159763×2
Dark Tan
2 pieces
Technic Axle 4.5 with StopDark TanPart 7784Element 6569661×2
Orange
2 pieces
Technic Axle and Pin Connector PerpendicularOrangePart 6536Element 6261377 or 6135088×2
Trans-Clear
2 pieces
Tile 1 x 2 with GrooveTrans-ClearPart 3069bElement 6514223 or 6251294Also in White×2
Bright Green
1 piece
Bar 3LBright GreenPart 87994Element 61617721 spare in the box×1
Dark Orange
1 piece
Plate 1 x 3Dark OrangePart 3623Element 6186007 or 4617599×1
Dark Pink
1 piece
Plate 2 x 3 with 1 x 1 CutoutDark PinkPart 73831Element 6451742×1
Flat Silver
1 piece
Technic Beam 1 x 9 Thin with 3 HolesFlat SilverPart 4586Element 6453350×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 42226-1[No Color/Any Color]Part 10115269Element 6580515×1
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.