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 and Pin Connector Perpendicular 3L with Centre Pin HoleBlack ×3Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Beam 1 x 11 ThickBlack ×1Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Beam 1 x 3 ThickBlack ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Beam 1 x 4 ThinBlack ×2Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Beam 1 x 5 ThickBlack ×5Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Beam 2 x 4 L-Shape ThickBlack ×6Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
2 more look-alike pairs
Technic Driving Ring Connector Smooth [2 rounded and 2 flat side walls]Black ×1Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Technic Pin Connector Hub with 1 AxleBlack ×4Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Wedge Plate 3 x 2 LeftBlackPart 43723Element 4180536×1
Wedge Plate 3 x 2 RightBlackPart 43722Element 4180508×1
Bricks Sloped
1 piece
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)BlackPart 54200Element 4504382 or 42871591 spare in the box×1
Stickers
1 piece
Sticker Sheet for Set 42162-1[No Color/Any Color]Part 10106222Element 6467794×1
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.