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 Angled #1Black ×10Dark Bluish Gray ×13Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector PerpendicularBlack ×16Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
Technic Beam 1 x 11 ThickBlack ×4Dark Bluish Gray ×3Black is darker than Dark Bluish Gray.
Technic Beam 1 x 15 ThickBlack ×4Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Beam 1 x 5 ThickBlack ×17Dark Bluish Gray ×12Black is darker than Dark Bluish Gray.
Technic Beam 1 x 9 ThickBlack ×12Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
5 more look-alike pairs
Technic Beam 2 x 4 L-Shape ThickBlack ×14Dark Bluish Gray ×5Black is darker than Dark Bluish Gray.
Technic Beam 3 x 5 L-Shape ThickBlack ×14Dark Bluish Gray ×4Black is darker than Dark Bluish Gray.
Technic Pin Connector Round 1L [Beam]Black ×17Dark Bluish Gray ×14Black is darker than Dark Bluish Gray.
Tile 1 x 1 with GrooveBlack ×4Dark Bluish Gray ×1Black is darker than Dark Bluish Gray.
Tile 1 x 2 with GrooveBlack ×1Dark Bluish Gray ×2Black is darker than Dark Bluish Gray.
LEGO's request form asks for the set number (42127) and each piece's element ID, both listed above.
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Clear every mark for this set?
Piece checklist
Black
728 pieces
Bar 3LBlackPart 87994Element 6185316 or 60935251 spare in the box×2
Bar Holder with Hole and Bar HandleBlackPart 23443Element 6321194 or 6143318×6
Bracket 1 x 2 - 2 x 2 InvertedBlackPart 99207Element 6000650×2
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope)BlackPart 54200Element 4504382 or 42871591 spare in the box×2
Brick Sloped 30° 1 x 2 x 2/3BlackPart 85984Element 4548180×2
Brick Sloped 45° 2 x 1 with 2/3 Inverted Cutout and no studBlackPart 28192Element 6267487×4
Brick Special 1 x 1 with HeadlightBlackPart 4070Element 407026×2
Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 7 TeethBlackPart 57360Element 6271535×4
Hinge Cylinder 1 x 3 Locking with 1 Finger and Technic Friction Pin with Squared HoleBlackPart 57697Element 6271542×4
Plate 1 x 1BlackPart 3024Element 3024261 spare in the box×4
Plate 1 x 2BlackPart 3023Element 302326×3
Plate 1 x 3BlackPart 3623Element 362326×4
Plate 1 x 4BlackPart 3710Element 371026×2
Plate 1 x 6BlackPart 3666Element 366626×2
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening)BlackPart 4032aElement 403226×2
Plate Round 4 x 4 with Pin HoleBlackPart 60474Element 4515350×2
Plate Special 1 x 2 with Pin Hole UnderneathBlackPart 18677Element 6192309 or 6167497×2
Plate Special Round 2 x 2 with Center Stud (Jumper Plate)BlackPart 18674Element 6195325×8
Steering Wheel with 4 Studs on CenterBlackPart 67811Element 6299938×1
Technic Axle 10BlackPart 3737Element 373726×2
Technic Axle Connector Smooth [with x Hole + Orientation]BlackPart 59443Element 6084612 or 4512363×5
Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L AxleBlackPart 18651Element 6089119×13
Technic Axle and Pin Connector Angled #1BlackPart 32013Element 6284699 or 4107085Also in Dark Bluish Gray×10
Technic Axle and Pin Connector PerpendicularBlackPart 6536Element 6261371 or 4173668Also in Dark Bluish Gray×16
Technic Axle and Pin Connector Perpendicular 3L with 2 Pin HolesBlackPart 42003Element 6273708 or 4200326×4
Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L AxleRedPart 11214Element 6209519×23
Technic Pin Connector Round [Slotted]RedPart 62462Element 6173126 or 4526984×2
Tan
44 pieces
Technic Axle 4 with Centre StopTanPart 99008Element 4666999×13
Technic Axle Pin without Friction Ridges LengthwiseTanPart 3749Element 4666579 or 4186017×2
Technic Engine Crankshaft CenterTanPart 2854Element 6355727 or 6013937×3
Technic Gear 12 Tooth BevelTanPart 6589Element 4565452 or 4514556×6
Technic Gear 20 Tooth BevelTanPart 32198Element 6031962 or 4514557×1
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening]TanPart 18575Element 6346517 or 6084724×1
Technic Pin 3/4TanPart 32002Element 6663097 or 60139381 spare in the box×8
Technic Pin Connector Round 1L [Beam]TanPart 18654Element 61679232 spares in the box×8
Technic Pin Long without Friction Ridges, with Anti-Roll NotchTanPart 39888Element 6321305×1
Tile 1 x 2 with GrooveTanPart 3069bElement 4114026×1
Trans-Light Blue
19 pieces
Wave / Flame Rounded Large with Marbled Trans Clear PatternTrans-Light BluePart 85959pat0002Element 6524437 or 6163984×3
Wave / Flame Rounded with Base RimTrans-Light BluePart 6126bElement 6167739×2
Wave / Flame Small with PinTrans-Light BluePart 37775Element 6514275 or 63577801 spare in the box×14
Flat Silver
17 pieces
Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each endFlat SilverPart 25214Element 6335563×12
Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / GrateFlat SilverPart 61409Element 6167922×2
Technic Pin Connector Round [Slotted]Flat SilverPart 62462Element 6245499 or 6054858×3
Trans-Clear
17 pieces
Light Brick 2 x 3 x 1 1/3 with Dark Bluish Gray Base [Yellow LED]Trans-ClearPart 62930Element 6555880 or 6429472×1
Plate 1 x 1Trans-ClearPart 3024Element 6513962 or 62520411 spare in the box×2
Plate 1 x 2Trans-ClearPart 3023Element 6514001 or 6240204×2
Technic Engine Cylinder without Side Slots, with Bottom SlotsTrans-ClearPart 2850bElement 6514435 or 6353017×8
Tile 1 x 1 with GrooveTrans-ClearPart 3070bElement 6581822 or 62542541 spare in the box×2
Tile 1 x 2 with GrooveTrans-ClearPart 3069bElement 6514223 or 6251294×2
Yellow
16 pieces
Technic Axle 5YellowPart 32073Element 6130008×6
Technic Axle 7YellowPart 44294Element 6130009×1
Technic Engine Piston RoundYellowPart 2851Element 4112203 or 285124×8
Technic Pin Connector Perpendicular 2 x 2 BentYellowPart 44809Element 6331919 or 4480924×1
Trans-Brown
10 pieces
Panel 1 x 2 x 1 [Rounded Corners]Trans-BrownPart 4865bElement 6514123 or 6246893×10
Trans-Red
8 pieces
Bar 4L (Lightsaber Blade / Wand)Trans-RedPart 30374Element 6507880 or 6167284×7
Light Brick 2 x 3 x 1 1/3 with Dark Bluish Gray Base [Red LED]Trans-RedPart 54869Element 6577222 or 6555881×1
Bright Light Orange
5 pieces
Plate 2 x 3Bright Light OrangePart 3021Element 6097503 or 4645048×1
Plate 2 x 8Bright Light OrangePart 3034Element 6133817×2
Plate Special 1 x 3 with 2 Studs with Groove and Inside Stud Holder (Jumper)Bright Light OrangePart 34103Element 6307254×2
Lime
3 pieces
Brick Sloped 45° 2 x 1 with 2/3 Cutout [New Version]LimePart 15672Element 6170559 or 6069166×2
Tile Round 1 x 1LimePart 98138Element 6284583 or 60578781 spare in the box×1
Reddish Brown
2 pieces
Technic Axle 5 with StopReddish BrownPart 15462Element 6159763×2
White
2 pieces
Technic Axle Pin 3L without Friction Ridges and 2L AxleWhitePart 65249Element 6289797×2
[No Color/Any Color]
1 piece
Sticker Sheet for Set 42127-1[No Color/Any Color]Part 77596Element 6338465×1
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.