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.
Technic Beam 1 x 2 ThickRedPart 43857Element 4185664×2
Technic Beam 1 x 3 ThickRedPart 32523Element 4153718×2
Technic Beam 3 x 3 T-Shape ThickRedPart 60484Element 6194079×1
Technic Beams Special
3 pieces
Technic Beam 1 x 2 with Ball Joint Straight, Smooth BallBlackPart 64276Element 4560108 or 4537514×1
Technic Beam 1 x 2 with Ball Joint AngledRedPart 50923Element 6464980 or 6194067×2
Bars, Ladders and Fences
2 pieces
Bar 4L (Lightsaber Blade / Wand)Trans-RedPart 30374Element 6507880 or 6167284×2
Bricks Curved
2 pieces
Brick Curved 4 x 1 Double, No StudsRedPart 93273Element 4633914×2
Plates
2 pieces
Plate 1 x 1RedPart 3024Element 3024211 spare in the box×2
Technic Bushes
2 pieces
Technic BushRedPart 3713Element 6271820 or 42271551 spare in the box×2
Technic Panels
2 pieces
Technic Panel Fairing #21 5L Small Smooth, Side BRedPart 11946Element 6340601 or 6022750×1
Technic Panel Fairing #22 5L Small Smooth, Side ARedPart 11947Element 6343986 or 6022752×1
Technic Special
2 pieces
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside]RedPart 41669Element 4185661×2
Tiles Special
1 piece
Tile Special Round 1 x 1 with Hollow BarRedPart 20482Element 6215539 or 61888271 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.