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 3Light Gray ×1Light Bluish Gray ×2Light Gray is yellower than Light Bluish Gray.
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 2 [X Opening]WhitePart 32269Element 4205111×2
Tools
9 pieces
Rip Cord, Rhotuka, 12L with Connector Block 1 x 3 x 5Dark Bluish GrayPart 50900Element 4255384 or 4242039×9
Technic Special
6 pieces
Technic Ball JointBlackPart 32474Element 4290713 or 4143539×2
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside]Dark OrangePart 41669Element 4201004×1
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside]Trans-Light BluePart 41669Element 4254587 or 4163568×3
Technic Bushes
5 pieces
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedLight GrayPart 32123bElement 4110050×5
Tubes and Hoses
2 pieces
Hose, Ribbed 7mm D. 10L / 8.0cmPearl Light GrayPart 78c10Element 4495210 or 4275395×1
Flexible Hose 8.5L with Tabbed Ends (Ends same color as Tube)WhitePart 73590c02aElement 4558220 or 4235542×1
Technic Beams Special
1 piece
Technic Beam 3 x 0.5 Liftarm with Boss and Pin / CrankPearl Light GrayPart 33299aElement 4177438×1
Technic Panels
1 piece
Technic Panel Fairing # 5 Small Short, Large Hole, Side ARedPart 32527Element 4143152×1
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.