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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.

App-Controlled Transformation Vehicle

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42140 App-Controlled Transformation Vehicle

772 pieces in 113 part and color combinations.

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.

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Piece checklist

Black 352 pieces

  • Equipment Paint Roller Brush Handle Smooth Handle Black Part 34076 Element 6192778 ×2
  • Technic Axle and Pin Connector Perpendicular Double Black Part 32291 Element 6280394 or 4140430 ×2
  • Technic Beam 1 x 11 Thick Black Part 32525 Element 6029578 or 4534909 Also in Dark Bluish Gray ×2
  • Technic Beam 1 x 11 Thick with Alternating Holes Black Part 73507 Element 6330585 ×2
  • Technic Beam 1 x 15 Thick with Alternating Holes Black Part 71710 Element 6321716 ×4
  • Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Black Part 60483 Element 6265091 or 6006140 ×11
  • Technic Beam 1 x 3 Thick Black Part 32523 Element 4142822 or 3252326 ×2
  • Technic Beam 1 x 5 Thick Black Part 32316 Element 4142135 or 4140429 ×4
  • Technic Beam 2 x 4 L-Shape Thick Black Part 32140 Element 6271825 or 4120017 ×2
  • Technic Beam 3 x 3 T-Shape Thick Black Part 60484 Element 4552347 or 4535771 ×2
  • Technic Beam Frame 3 x 19 with 2 Center Cross Beams, 3 Openings Thick Black Part 67491 Element 6377025 ×1
  • Technic Disc 3 x 3 Black Part 2723 Element 4218868 or 4121619 ×16
  • Technic Driving Ring Connector Smooth [2 rounded and 2 flat side walls] Black Part 42195 Element 6286381 ×1
  • Technic Link Tread Wide with Two Pin Holes, Soft Plastic Black Part 42479 Element 6325504 ×96
  • Technic Panel Fairing # 3 Small Smooth Long, Side A Black Part 64683 Element 4541924 ×1
  • Technic Panel Fairing # 4 Small Smooth Long, Side B Black Part 64391 Element 4541325 ×1
  • Technic Panel Fairing #5 Long Smooth, Side A Black Part 64681 Element 4558774 ×1
  • Technic Panel Fairing #6 Long Smooth, Side B Black Part 64393 Element 4558731 ×1
  • Technic Pin Connector Perpendicular 2 x 4 Bent - Beam with 90 Hole Ø 4.8 Black Part 11455 Element 6172966 or 6019986 ×4
  • Technic Pin Connector Round 1L [Beam] Black Part 18654 Element 6121485 1 spare in the box ×7
  • Technic Pin with Friction Ridges Lengthwise with No Center Slots Black Part 61332 Element 6279875 1 spare in the box ×85
  • Technic Steering Wheel Pilot's Yoke [Closed Top] Black Part 49151 Element 6378464 ×1
  • Technic Tread Attachment Black Part 24375 Element 6139223 2 spares in the box ×96
  • Technic Tread Sprocket Wheel Large 10 Tooth Black Part 57519 Element 6526471 or 4582792 ×2
  • Tyre 14 x 6 Solid Smooth Black Part 50951 Element 4246901 ×3
  • Wheel 11 x 8 with Center Groove Black Part 42610 Element 6291068 ×3

Blue 140 pieces

  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×33
  • Technic Axle and Pin Connector Angled #1 Blue Part 32013 Element 6332570 or 4107797 ×3
  • Technic Beam 1 x 2 Thick Blue Part 43857 Element 6057802 or 4185665 ×2
  • Technic Beam 1 x 3 Thick Blue Part 32523 Element 4509376 or 4144284 ×1
  • Technic Beam 1 x 5 Thick Blue Part 32316 Element 4142134 or 4128591 ×4
  • Technic Beam 2 x 4 L-Shape Thick Blue Part 32140 Element 6271829 or 4168114 ×6
  • Technic Beam 2 x 5 L-Shape with Quarter Ellipse Thick Blue Part 80286 Element 6407067 or 6381986 ×1
  • Technic Beam 3 x 5 L-Shape Thick Blue Part 32526 Element 4158923 ×6
  • Technic Gear 12 Tooth with Axle Hole Blue Part 69778 Element 6396479 ×2
  • Technic Panel Curved and Bent 6 x 3 Blue Part 24116 Element 6268009 or 6133684 ×1
  • Technic Panel Fairing # 3 Small Smooth Long, Side A Blue Part 64683 Element 6381988 ×1
  • Technic Panel Fairing # 4 Small Smooth Long, Side B Blue Part 64391 Element 6381987 or 6231873 ×1
  • Technic Panel Fairing #21 5L Small Smooth, Side B Blue Part 11946 Element 6352643 or 6330924 ×2
  • Technic Panel Fairing #22 5L Small Smooth, Side A Blue Part 11947 Element 6352661 or 6330928 ×2
  • Technic Panel Fairing #5 Long Smooth, Side A Blue Part 64681 Element 6330921 ×1
  • Technic Panel Fairing #6 Long Smooth, Side B Blue Part 64393 Element 6330920 ×1
  • Technic Panel Fairing 2 x 1 x 1 Blue Part 89679 Element 6385238 ×1
  • Technic Panel Fairing 2 x 3 x 1 Blue Part 71682 Element 6331025 ×2
  • Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 1 spare in the box ×4
  • Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge] Blue Part 65487 Element 6282145 ×7
  • Technic Pin Connector Round [Slotted] Blue Part 62462 Element 6210497 or 4595160 ×4
  • Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot Blue Part 42924 Element 6299413 ×55

Dark Bluish Gray 83 pieces

  • Bar 6L with Stop Ring Dark Bluish Gray Part 63965 Element 6170420 or 6081987 ×2
  • Large Figure Weapon Lightsaber Hilt with Axle Hole and Two Bar Holders Dark Bluish Gray Part 24122 Element 6310174 ×4
  • Motor, Large, Powered Up Dark Bluish Gray Part 22169 Element 6545732 or 6456189 ×2
  • Technic Axle 5.5 with Stop [Rounded Short End] Dark Bluish Gray Part 59426 Element 4508553 ×3
  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Dark Bluish Gray Part 11214 Element 6015356 ×19
  • Technic Axle and Pin Connector Angled #3 - 157.5° Dark Bluish Gray Part 32016 Element 6366184 or 6283865 ×2
  • Technic Axle and Pin Connector Perpendicular Dark Bluish Gray Part 6536 Element 6536199 or 6261374 ×6
  • Technic Beam 1 x 11 Thick Dark Bluish Gray Part 32525 Element 4603472 or 4534914 Also in Black ×5
  • Technic Beam 1 x 5 Thin Dark Bluish Gray Part 32017 Element 32017199 or 6215176 ×16
  • Technic Beam 1 x 7 Thick Dark Bluish Gray Part 32524 Element 4495931 or 4210752 ×5
  • Technic Panel Curved and Bent 6 x 3 Dark Bluish Gray Part 24116 Element 6268008 or 6133243 ×1
  • Technic Tread Sprocket Wheel Large Diameter 7 Holes, 14 Tooth Dark Bluish Gray Part 42529 Element 6254781 ×2
  • Technic Wedge Belt Wheel [aka Pulley] Dark Bluish Gray Part 4185 Element 6321744 or 4587275 ×16

Light Bluish Gray 72 pieces

  • Hub, Powered Up 4-Port (Technic Control+) - Screw Opening Light Bluish Gray Part 85824 Element 6588258 or 6380608 ×1
  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×3
  • Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×2
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Light Bluish Gray Part 32184 Element 6276969 or 4211621 ×2
  • Technic Axle and Pin Connector Perpendicular Triple Light Bluish Gray Part 63869 Element 6331441 or 4538007 ×1
  • Technic Beam 1 x 11 Thick Light Bluish Gray Part 32525 Element 4611705 or 4534910 ×4
  • Technic Beam 1 x 11 Thick with Alternating Holes Light Bluish Gray Part 73507 Element 6362250 ×2
  • Technic Beam 1 x 13 Thick Light Bluish Gray Part 41239 Element 4522934 or 4156299 ×3
  • Technic Beam 3 x 3 T-Shape Thick Light Bluish Gray Part 60484 Element 4552348 or 4535772 ×2
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 1 spare in the box ×20
  • Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 1 spare in the box ×7
  • Technic Pin Connector Round [Slotted] Light Bluish Gray Part 62462 Element 6173127 or 4526985 ×20
  • Technic Pin Long 3l with Stop and Hole Light Bluish Gray Part 77765 Element 6338962 ×2
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 1 spare in the box ×1
  • Technic Shock Absorber 6.5L with Soft Spring, Tight Coil, Black Piston Rod [Complete Assembly] Light Bluish Gray Part 89953c01 Element 6378472 ×2

Orange 42 pieces

  • Technic Beam 1 x 13 Thick Orange Part 41239 Element 4629802 or 4164424 ×2
  • Technic Beam 1 x 5 Thick Orange Part 32316 Element 6143014 or 4142138 ×2
  • Technic Beam 1 x 7 Thick Orange Part 32524 Element 6339024 or 6102621 ×2
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Orange Part 6629 Element 6360128 or 6097284 ×2
  • Technic Beam 1 x 9 Thick Orange Part 40490 Element 6135086 or 4157376 ×2
  • Technic Beam 3 x 5 L-Shape Thick Orange Part 32526 Element 6143015 or 4626639 ×4
  • Technic Panel 3 x 7 x 1 Orange Part 71709 Element 6358256 ×1
  • Technic Pin Connector Round [Slotted] Orange Part 62462 Element 6173129 or 4538144 ×2
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole] Orange Part 65304 Element 6347790 ×25

Reddish Brown 26 pieces

  • Technic Axle 3 with Stop Reddish Brown Part 24316 Element 6135494 ×10
  • Technic Axle 5 with Stop Reddish Brown Part 15462 Element 6159763 ×16

White 14 pieces

  • Axle Hose, Soft 11L White Part 32199 Element 6384174 or 4125556 ×2
  • Rubber Belt Small [15mm ID] [Round Cross Section] White Part 85543 Element 6699001 or 4580665 ×1
  • Technic Axle and Pin Connector Angled #1 White Part 32013 Element 6332573 or 4118981 ×1
  • Technic Axle and Pin Connector Angled #3 - 157.5° White Part 32016 Element 6261390 or 6063767 ×2
  • Technic Axle and Pin Connector Perpendicular White Part 6536 Element 6261372 or 4173670 ×2
  • Technic Beam 1 x 9 Thick White Part 40490 Element 6001831 or 4156341 ×2
  • Technic Panel Fairing #21 5L Small Smooth, Side B White Part 11946 Element 6330084 or 6114580 ×1
  • Technic Panel Fairing #22 5L Small Smooth, Side A White Part 11947 Element 6343987 or 6114583 ×1
  • Technic Pin Connector Round [Slotted] White Part 62462 Element 6550164 or 6173116 ×2

Tan 8 pieces

  • Technic Axle 4 with Centre Stop Tan Part 99008 Element 4666999 ×2
  • Technic Pin Long without Friction Ridges, with Anti-Roll Notch Tan Part 39888 Element 6321305 ×6

Red 7 pieces

  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×3
  • Technic Axle 4 Red Part 3705 Element 6129995 or 4265797 ×2
  • Technic Pin with Friction Ridges Lengthwise and Towball - Round Pin Hole Red Part 66906 Element 6360104 ×2

Trans-Clear 7 pieces

  • Tile Round 1 x 1 Trans-Clear Part 98138 Element 6514191 or 6274738 1 spare in the box ×7

Vibrant Yellow 6 pieces

  • Technic Beam 1 x 13 Thick Vibrant Yellow Part 41239 Element 6381984 ×2
  • Technic Beam 1 x 7 Thick Vibrant Yellow Part 32524 Element 6381983 ×2
  • Technic Panel Fairing 2 x 1 x 1 Vibrant Yellow Part 89679 Element 6385239 ×2

Dark Turquoise 4 pieces

  • Technic Connector Beam 3 x 3 Dark Turquoise Part 39793 Element 6252655 ×1
  • Wire Clip with Axle Hole Dark Turquoise Part 49283 Element 6295401 ×3

Magenta 4 pieces

  • Technic Connector Beam 3 x 3 Magenta Part 39793 Element 6252656 ×1
  • Wire Clip with Axle Hole Magenta Part 49283 Element 6263193 ×3

Yellow 3 pieces

  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 1 spare in the box ×3

Dark Azure 2 pieces

  • Technic Gear 20 Tooth with Axle Hole [+ Opening] Dark Azure Part 69779 Element 6396480 ×2

Green 1 piece

  • Wire Clip with Axle Hole Green Part 49283 Element 6263072 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 42140-1 [No Color/Any Color] Part 80230 Element 6362707 ×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.

Request a replacement from LEGO

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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.

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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.

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