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 Beam 1 x 15 ThickBlack ×4Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Beam 1 x 7 Thick with Alternating HolesBlack ×1Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Technic Pin Connector Hub with 2 Perpendicular AxlesBlack ×2Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Gear 16 Tooth with Clutch on Both SidesRedPart 18946Element 6100930×1
Technic Gear 12 Tooth BevelTanPart 6589Element 4565452 or 4514556×4
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening]TanPart 18575Element 6346517 or 6084724×1
Wheels and Tyres
15 pieces
Tyre 81.6 x 44 Slick with Yellow 'PIRELLI', 'P ZERO' PrintBlackPart 4410pr0001Element 6522743×4
Wheel 56 x 34 Technic Racing Medium with 6 Pin HolesBlackPart 15038Element 6284703 or 6253256×4
Wheel Cover for Wheel 34 x 56 with Red, Yellow, White Circles PrintBlackPart 4472pr0001Element 6541099×4
Wheel 11 x 8 with Center GrooveLight Bluish GrayPart 42610Element 4211758×3
Technic Bushes
14 pieces
Technic BushLight Bluish GrayPart 3713Element 6275844 or 62718171 spare in the box×1
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedLight Bluish GrayPart 32123bElement 6271165 or 42115731 spare in the box×5
Technic BushRedPart 3713Element 6271820 or 42271551 spare in the box×5
Technic Bush 1/2 Smooth with Axle Hole Semi-ReducedYellowPart 32123bElement 6271167 or 32123241 spare in the box×3
Plates
4 pieces
Plate 1 x 2RedPart 3023Element 302321×2
Plate 1 x 3RedPart 3623Element 362321×2
Tiles
4 pieces
Tile 1 x 1 with GrooveRedPart 3070bElement 3070211 spare in the box×2
Tile 2 x 3RedPart 26603Element 6189130×2
Tiles Round and Curved
4 pieces
Tile Round 1 x 1Light Bluish GrayPart 98138Element 6284071 or 46502601 spare in the box×4
Bricks Curved
2 pieces
Brick Curved 4 x 1 No Studs [Stud Holder with Symmetric Ridges]RedPart 11153Element 6583512 or 6045937×2
Stickers
2 pieces
Sticker Sheet 1 for Set 42207-1[No Color/Any Color]Part 10110651Element 6522703×1
Sticker Sheet 2 for Set 42207-1[No Color/Any Color]Part 10113426Element 6545401×1
Technic Special
2 pieces
Technic Changeover Catch - New StyleRedPart 51149Element 6313493×2
Tubes and Hoses
2 pieces
Axle Hose, Soft 16LBlackPart 32202Element 6057525 or 4121649×1
Axle Hose, Soft 19LRedPart 32235Element 4614802 or 4227553×1
Minifig Accessories
1 piece
Sports Hockey Stick, Round ShaftBlackPart 64000Element 6473449×1
Tiles Special
1 piece
Tile Special 1 x 2 Grille with Bottom GrooveTrans-RedPart 2412bElement 6250158 or 4190187×1
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.