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.
Technic Axle 3 with StudWhitePart 6587Element 6217157 or 4165547×13
Technic Axle 4WhitePart 3705Element 4143340 or 370501×5
Technic Axle 5WhitePart 32073Element 4166139×8
Technic Axle 8WhitePart 3707Element 4143690 or 370701×4
Technic Connectors
84 pieces
Technic Axle Connector 2 x 3 with Ball Socket, Open SidesDark GrayPart 32174Element 4171913 or 4140578×19
Technic Axle Connector 2 x 3 with Ball Socket, Open SidesLight GrayPart 32174Element 4164134×2
Technic Axle Connector with Axle HoleLimePart 32039Element 4265704 or 4175548×9
Technic Connector Block 3 x 3 Triangular with Axle, and Pin HoleMedium BluePart 32175Element 4172109 or 4154841×5
Technic Axle Connector 2 x 3 with Ball Socket, Open SidesTanPart 32174Element 4119329×45
Technic Axle Connector 2 x 3 with Ball Socket, Open SidesYellowPart 32174Element 4120123×4
Technic Beams
10 pieces
Technic Beam 1 x 2 ThinDark GrayPart 41677Element 4207748×10
Technic Special
10 pieces
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside]Trans-Light BluePart 41669Element 4254587 or 4163568×10
Technic Pins
9 pieces
Technic Axle Pin without Friction Ridges LengthwiseLight GrayPart 3749Element 4184168 or 4154179×1
Technic Pin without Friction Ridges LengthwiseLight GrayPart 3673Element 4184166 or 367302×3
Technic Axle Pin with Friction Ridges LengthwiseWhitePart 43093Element 4184171 or 4174429×5
Projectiles / Launchers
4 pieces
Large Figure Throwing Disk, Bionicle Mask Akaku PrintBlackPart 32171pr0002Element 4251523 or 4225001×1
Large Figure Throwing Disk, Bionicle Mask Hau PrintBlackPart 32171pr0006Element 4224999 or 4156716×1
Large Figure Throwing Disk, Bionicle Mask Miru PrintBlackPart 32171pr0005Element 4225000 or 4156718×1
Large Figure Throwing Disk, Bionicle Mask Pakari PrintBlackPart 32171pr0003Element 4224996 or 4156709×1
Technic Beams Special
2 pieces
Technic Beam 1 x 7 with FanDark BluePart 32177Element 4164355×2
Energy Effects
1 piece
Large Figure Weapon Sword, Toa Flame 2 x 12 with Two HolesRedPart 32558Element 4520004 or 4260041×1
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.