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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.
Checking
48 pieces in 27 part and color combinations.
LEGO counts 47 pieces. This inventory comes from a separate parts catalog and lists 48; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
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 Sloped 30° 1 x 1 x 2/3 (Cheese Slope)
Black ×2
Trans-Brown ×2
Trans-Brown is see-through: hold the piece up to a light.
LEGO's request form asks for the set number (212403) and each piece's element ID, both listed above.
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Bracket 1 x 1 - 1 x 2
×2
Brick Curved 2 x 1 with Inverted Cutout
×2
Brick Curved 2 x 2 x 2/3
×1
Brick Curved 4 x 1 Double, No Studs
×2
Brick Curved 4 x 1 No Studs [Stud Holder with Symmetric Ridges]
×2
Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / Grate
×2
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)
Also in Trans-Brown
×2
Brick Wedged, Curved 2 x 1 with Stud Notch Left
×2
Brick Wedged, Curved 2 x 1 with Stud Notch Right
×2
Plate 1 x 2
×2
Plate 2 x 2 Corner
×2
Plate 2 x 4
×2
Plate 2 x 6
×1
Plate Special 1 x 4 Rounded with 2 Open Studs
×1
Plate Special 2 x 2 with Only 2 studs
×1
Plate Special 2 x 2 with Wheel Holders with Cross (+) Slots on Pins
×2
Tyre 14 x 4 Smooth Small Single [New Style]
×2
Tyre 14 x 9 Smooth Small Wide Slick
×2
Wheel Arch, Mudguard 2 x 4 Studded with Hole
×1
Plate 2 x 2
×2
Plate Special Round 1 x 1 with Hollow Stud and Horizontal Bar 1L
×2
Wheel 8 x 6 with Slot
×2
Wheel 8 x 9 with Hole Notched for Wheels Holder Pin, Re-inforced Back
×2
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)
Also in Black
×2
Tile 1 x 2 with Groove
×2
Tile Round 1 x 1 Quarter
×2
Plate 4 x 4
×1
Tick each piece as you find it, or mark it missing.
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.
Request a replacement from LEGOMark 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.
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.
