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.
LEGO counts 738 pieces. This inventory comes from a separate parts catalog and lists 719; the two do not always count the same elements, so their totals differ. Spare parts are counted in neither figure.
Before you call it missing
Builders who report a missing piece often find it in one of these places. Tick each one off as you look.
Hose, Ribbed 7mm D. 11L / 8.8cmPearl Light GrayPart 78c11Element 4495208 or 4141672×8
Hose, Ribbed 7mm D. 7L / 5.6cmPearl Light GrayPart 78c07Element 4495203 or 4141522×2
Trans-Clear
10 pieces
Technic Engine Cylinder with Side SlotsTrans-ClearPart 2850aElement 4109610×10
Yellow
10 pieces
Technic Engine Piston RoundYellowPart 2851Element 4112203 or 285124×10
Trans-Red
2 pieces
Plate Round 1 x 1 with Solid StudTrans-RedPart 6141Element 6514051 or 62084501 spare in the box×2
Tan
1 piece
Technic Axle Pin without Friction Ridges LengthwiseTanPart 3749Element 4666579 or 4186017×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 8386-1[No Color/Any Color]Part 49856Element 4225251×1
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.