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.
2,374 pieces in 466 part and color combinations, plus 3 minifigures.
The official piece count includes the 12 parts inside the set's minifigures, which this inventory lists separately. 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.
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.
Bracket 1 x 1 - 1 x 2Black ×2Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Bracket 1 x 2 - 2 x 2 InvertedBlack ×14Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Plate 1 x 2Black ×17Dark Bluish Gray ×11Black is darker than Dark Bluish Gray.
Plate 1 x 4Black ×13Dark Bluish Gray ×5Black is darker than Dark Bluish Gray.
Plate 1 x 6Black ×2Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Plate 2 x 2Black ×2Dark Bluish Gray ×8Black is darker than Dark Bluish Gray.
8 more look-alike pairs
Plate 2 x 8Black ×7Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Plate Round 1 x 1 with Solid StudBlack ×8Dark Bluish Gray ×3Black is darker than Dark Bluish Gray.
Plate Special 1 x 2 with Pin Hole UnderneathBlack ×2Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Beam 1 x 11 ThickBlack ×1Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Technic Beam 1 x 13 ThickBlack ×1Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Technic Beam 1 x 3 ThickBlack ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Beam 2 x 3 Thick [90° Offset Centre Beam Hole]Black ×4Dark Bluish Gray ×6Black is darker than Dark Bluish Gray.
Technic Brick 1 x 12 [11 Pin Holes]Black ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Plate 1 x 1Medium AzurePart 3024Element 6603339 or 6097493×1
Plate 1 x 4Medium AzurePart 3710Element 6603965 or 6070757×2
Plate 1 x 6Medium AzurePart 3666Element 6603312 or 4625036×1
Orange
3 pieces
Brick and Axle Separator v2.0OrangePart 96874Element 6240515 or 4654448×1
Plate 1 x 1OrangePart 3024Element 4524929 or 4203454×2
Dark Azure
2 pieces
Tile 1 x 3Dark AzurePart 63864Element 6412744×2
Trans-Clear
1 piece
Brick Sloped 45° 2 x 2Trans-ClearPart 3039Element 6514100 or 6244886×1
Trans-Light Blue
1 piece
Large Figure Weapon, Barrel with 2 Pin Holes and 3 Axle HolesTrans-Light BluePart 98585Element 6503210 or 6248915×1
[No Color/Any Color]
1 piece
Sticker Sheet for Set 72154-1[No Color/Any Color]Part 10118301Element 6613527×1
Minifigures
3 figures
PicnickerMinifigure, checked as a whole figure×1
Professor OakMinifigure, checked as a whole figure×1
RedMinifigure, checked as a whole figure×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.