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 and Pin Connector Angled #2 - 180°Black ×8Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin HoleBlack ×1Dark Bluish Gray ×15Black is darker than Dark Bluish Gray.
Technic Beam 1 x 3 ThickBlack ×8Dark Bluish Gray ×6Black is darker than Dark Bluish Gray.
Technic Pin Connector Hub with 1 AxleBlack ×6Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Axle 4RedPart 3705Element 6129995 or 4265797×5
Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L AxleRedPart 11214Element 6209519×17
Technic Pin 1/2 with FrictionRedPart 89678Element 63781201 spare in the box×2
Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Small Squared Pin Holes]RedPart 44874Element 6323573×2
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole]RedPart 65304Element 6347789×2
Technic Pin with Friction Ridges Lengthwise and Towball - Round Pin HoleRedPart 66906Element 6360104×6
White
17 pieces
Bar 2L with Stop in CenterWhitePart 78258Element 63576801 spare in the box×4
Plate Special 1 x 2 Rounded with 2 Open StudsWhitePart 35480Element 6552167 or 6550175×7
Technic Beam 1 x 2 Thick with Pin Hole and Axle HoleWhitePart 60483Element 6265135 or 6177268×4
Technic Beam 1 x 9 ThickWhitePart 40490Element 6001831 or 4156341×2
Yellow
15 pieces
Technic Axle 7YellowPart 44294Element 6130009×3
Technic Engine CrankshaftYellowPart 2853Element 6640378 or 4119474×2
Technic Engine Piston RoundYellowPart 2851Element 4112203 or 285124×6
Technic Shock Absorber 6.5L with Hard Spring, Tight Coil in Middle [Complete Assembly]YellowPart 76537Element 7653726 or 6027566×4
Tan
9 pieces
Technic Engine Crankshaft CenterTanPart 2854Element 6355727 or 6013937×2
Technic Gear 12 Tooth BevelTanPart 6589Element 4565452 or 4514556×3
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×3
[No Color/Any Color]
3 pieces
Sticker Sheet 1 for Set 42141-1[No Color/Any Color]Part 10100112Element 6401184×1
Sticker Sheet 2 for Set 42141-1[No Color/Any Color]Part 10100113Element 6401192×1
Sticker Sheet 3 for Set 42141-1[No Color/Any Color]Part 01677Element 6390930×1
Reddish Brown
2 pieces
Technic Axle 3 with StopReddish BrownPart 24316Element 6135494×2
Trans-Red
1 piece
Tile 1 x 1 with GrooveTrans-RedPart 3070bElement 6581817 or 62542481 spare in the box×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.