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 9 Bent (7 - 3) ThickRed ×4Trans-Red ×2Trans-Red is see-through: hold the piece up to a light.
Technic Axle and Pin Connector Angled #2 - 180°Black ×4Dark Bluish Gray ×3Black is darker than Dark Bluish Gray.
Technic Beam 1 x 15 ThickBlack ×4Dark Bluish Gray ×6Black is darker than Dark Bluish Gray.
Technic Beam 1 x 3 ThinBlack ×2Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Beam 1 x 5 ThickPearl Light GrayPart 32316Element 4210591 or 4177433×1
Technic Engine Tunable, Block with Two Round Air Scoops [Fits 2133]Pearl Light GrayPart 46452Element 4203308×1
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside]Pearl Light GrayPart 41669Element 4284480 or 4177440×4
Dark Bluish Gray
24 pieces
Dish 2 x 2 Inverted [Radar]Dark Bluish GrayPart 4740Element 4211010×2
Technic Axle 3 with StudDark Bluish GrayPart 6587Element 6587199 or 6129590×4
Technic Axle and Pin Connector Angled #2 - 180°Dark Bluish GrayPart 32034Element 32034199 or 6271876Also in Black×3
Technic Beam 1 x 15 ThickDark Bluish GrayPart 32278Element 32278199 or 4542576Also in Black×6
Technic Beam 1 x 3 ThinDark Bluish GrayPart 6632Element 6632199 or 6364452Also in Black×4
Technic Pin 3/4Dark Bluish GrayPart 32002Element 32002199 or 42110501 spare in the box×4
Technic Steering Wheel Pilot's Yoke [Open Stud, Axle Hole with X Opening]Dark Bluish GrayPart 40001Element 6023800 or 4210710×1
Tan
3 pieces
Technic Axle Pin without Friction Ridges LengthwiseTanPart 3749Element 4666579 or 4186017×3
Pearl Dark Gray
2 pieces
Technic Panel Fairing #20 Large Long, Small Hole, Side APearl Dark GrayPart 44350Element 4277116 or 4195435×1
Technic Panel Fairing #21 Large Long, Small Hole, Side BPearl Dark GrayPart 44351Element 4277093 or 4195436×1
Trans-Light Blue
2 pieces
Dish 3 x 3 Inverted [Radar]Trans-Light BluePart 43898Element 6507918 or 6244733×2
Trans-Medium Blue
2 pieces
Technic Tooth 1 x 3 with Axle Hole [Rounded Underside]Trans-Medium BluePart 41669Element 6174477 or 4163578×2
Trans-Red
2 pieces
Technic Beam 1 x 9 Bent (7 - 3) ThickTrans-RedPart 32271Element 4175576 or 3227141Also in Red×2
[No Color/Any Color]
1 piece
Sticker Sheet for Set 8649-1[No Color/Any Color]Part 53102Element 4264146×1
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.