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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.
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
LEGO's request form asks for the set number (30194) and each piece's element ID, both listed above.
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Bracket 1 x 2 - 1 x 4 [Square Corners]
×1
Brick 1 x 3
×2
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)
1 spare in the box
×2
Brick Wedged, Curved 6 x 4 x 1 1/3 with 4 x 4 Base with Windows and Black, Silver and Red Print
×1
Panel 1 x 1 x 1 Corner
×2
Plate 1 x 2
×2
Plate 2 x 3
×1
Tile 1 x 2 with Groove
×2
Vehicle Body, Wheel Arch / Mudguard 2 x 4 with Headlights and Curved Fenders
×1
Vehicle Body, Wheel Arch / Mudguard 3 x 4 x 1 2/3 Low Profile, Curved Front with Ferrari 458 Italia Print
×1
Plate 2 x 4
×1
Plate Special 2 x 2 with Wheels Holder Wide [Reinforced Underside]
×1
Pullback Motor 8 x 4 x 2/3
×1
Tyre 14 x 6 Solid Smooth
×4
Wheel 11 x 6 with 8 'Y' Spokes [Plain]
×4
Plate Round 1 x 1 with Solid Stud
1 spare in the box
×4
Plate 2 x 6
×1
Tile 2 x 4 with Groove
×1
Sticker Sheet for Set 30194-1
×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.
