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LEGO Missing Piece Checker

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.

Jay's Electro Mech

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71740 Jay's Electro Mech

98 pieces in 59 part and color combinations, plus 2 minifigures.

The official piece count includes the 8 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

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

Dark Blue 13 pieces

  • Animal, Scorpion Dark Blue Part 30169 Element 6251333 or 6200668 ×1
  • Bracket 1 x 2 - 2 x 2 Dark Blue Part 44728 Element 6554216 or 6224778 Also in Black ×2
  • Brick Curved 4 x 3 with 3 Layers, 1 x 3 Cutout on Underside Dark Blue Part 66955 Element 6323472 ×2
  • Brick Sloped Inverted 45° 6 x 2 Double with 2 x 4 Recessed Dark Blue Part 22889 Element 6251246 ×2
  • Mudguard 2 x 4 with Molded Headlights Dark Blue Part 44674 Element 6289312 or 6097585 ×4
  • Plate 1 x 8 Dark Blue Part 3460 Element 6250216 or 4186628 ×1
  • Wedge Plate 2 x 4 Dark Blue Part 51739 Element 4613335 or 4251895 ×1

Light Bluish Gray 12 pieces

  • Brick 1 x 3 Light Bluish Gray Part 3622 Element 4211428 ×2
  • Plate 2 x 3 Light Bluish Gray Part 3021 Element 4211396 ×2
  • Plate Special 1 x 2 5.9mm Centre Side Towball Socket Light Bluish Gray Part 14704 Element 6414561 or 6338165 ×2
  • Plate Special 1 x 2 with Clips Horizontal [Open O Clips] Light Bluish Gray Part 60470b Element 6337268 or 4556157 ×2
  • Projectile, Arrow with Shaft, Hollow Black Rubber End Light Bluish Gray Part 46537 Element 6307940 ×1
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 1 spare in the box ×1
  • Tile 2 x 4 with Groove Light Bluish Gray Part 87079 Element 4560183 ×2

Pearl Gold 12 pieces

  • Brick Round 2 x 2 [Grill] Pearl Gold Part 92947 Element 6107194 ×2
  • Brick Sloped 45° 2 x 1 Triple with Inside Stud Holder Pearl Gold Part 15571 Element 6075079 ×1
  • Tile Round 2 x 2 with Black Shuriken Print Pearl Gold Part 14769pr1173 Element 6321340 ×4
  • Tile Round 2 x 2 with Golden Dragon on Red Background Print Pearl Gold Part 14769pr9998 Element 6287963 ×1
  • Weapon Sai Pearl Gold Part 98139 Element 6270135 or 4646866 1 spare in the box ×1
  • Weapon Sword, Big Blade with Bar Pearl Gold Part 98137 Element 6270131 or 4646843 ×3

Black 10 pieces

  • Bracket 1 x 2 - 2 x 2 Black Part 44728 Element 6117973 or 6048855 Also in Dark Blue ×1
  • Brick Arch 1 x 4 Black Part 3659 Element 365926 ×2
  • Brick Round 4 x 4 Centre Hole Black Part 87081 Element 4558957 Also in Dark Bluish Gray ×1
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Black Part 87580 Element 6663108 or 4565323 ×1
  • Plate Special 2 x 2 with Towball and Hole Black Part 15456 Element 6448318 or 6359224 ×2
  • Technic Brick Special 2 x 2 with Pin Hole, with 2 Rotation Joint Sockets Black Part 48172 Element 6296186 or 4275826 ×1
  • Technic Pin with Friction Ridges Lengthwise with No Center Slots Black Part 61332 Element 6279875 1 spare in the box ×1
  • Vehicle Base, Brick Special 4 x 10 with 4 Pins Black Part 30076 Element 6352696 or 6023257 ×1

Dark Bluish Gray 10 pieces

  • Brick Round 4 x 4 Centre Hole Dark Bluish Gray Part 87081 Element 4558959 Also in Black ×4
  • Brick Sloped 45° 2 x 1 Double with Inside Stud Holder Dark Bluish Gray Part 3044c Element 4226221 ×1
  • Brick Special 1 x 2 with Vertical Clip [Open O Clip] Dark Bluish Gray Part 30237b Element 6335306 or 6127738 ×2
  • Brick Wedged, Sloped 4 x 4 Fractured Polygon Top Dark Bluish Gray Part 64867 Element 6172134 or 6055063 ×1
  • Launcher, Brick Special 2 x 6 Spring Shooter with Light Bluish Gray Top Dark Bluish Gray Part 49743c01 Element 6296378 ×1
  • Rock Panel 2 x 4 x 6 Dark Bluish Gray Part 47847 Element 4513326 ×1

Blue 9 pieces

  • Brick Curved 3 x 2 No Studs Blue Part 24309 Element 6198025 ×4
  • Mech Leg, Left, with Black Pin Blue Part 70946c01 Element 6323453 ×1
  • Mech Leg, Right, with Black Pin Blue Part 70943c01 Element 6323440 ×1
  • Plate 2 x 2 Blue Part 3022 Element 4613973 or 302223 ×2
  • Wedge Brick Special 4 x 10 x 4 with 3 x 4 Recessed and Pin Holes- Plane Bottom Blue Part 44665 Element 6323471 ×1

Dark Purple 8 pieces

  • Brick Sloped 30° 1 x 2 x 2/3 Dark Purple Part 85984 Element 4566607 ×2
  • Plate 1 x 4 Dark Purple Part 3710 Element 6167464 or 4225140 ×2
  • Tile Round 2 x 2 with Bottom Stud Holder Dark Purple Part 14769 Element 6097501 ×4

Yellow 6 pieces

  • Plate Round 4 x 4 with Pin Hole Yellow Part 60474 Element 4515349 ×2
  • Plate Special 1 x 2 with Clips Horizontal [Open O Clips] Yellow Part 60470b Element 6337231 or 4556156 ×1
  • Plate Special 2 x 2 with 1 Pin Hole [Complete Underside Rib] Yellow Part 10247 Element 6061025 ×1
  • Technic Brick 1 x 2 [1 Pin Hole] Yellow Part 3700 Element 370024 ×2

Dark Tan 5 pieces

  • Brick Curved 2 x 2 with Lip, No Studs Dark Tan Part 30602 Element 6291049 ×2
  • Tile 1 x 3 with Wood Grain Print Dark Tan Part 63864pr0012 Element 6329820 ×2
  • Tile 2 x 3 Dark Tan Part 26603 Element 6328307 ×1

White 3 pieces

  • Animal Body Part, Dog Bone [Long] White Part 92691 Element 4600307 ×2
  • Tile Special 2 x 2 with Top Pin [Squared Holes] White Part 49153 Element 6313138 ×1

Flat Silver 2 pieces

  • Large Figure Weapon 6 Blade Ninja Star / Shuriken Flat Silver Part 41125 Element 6327940 ×1
  • Weapon Sword / Scimitar Notched Blade Flat Silver Part 60752 Element 4611882 ×1

Green 2 pieces

  • Plant, Round 1 x 1 - 3 Bamboo Leaves Green Part 30176 Element 6270003 or 6248461 ×2

Reddish Brown 2 pieces

  • Brick Sloped 75° 2 x 1 x 3 with Hollow Stud Reddish Brown Part 4460b Element 4270470 ×2

Medium Nougat 1 piece

  • Insect, Spider with Elongated Tail Section Medium Nougat Part 29111 Element 6234805 ×1

Olive Green 1 piece

  • Brick Curved 2 x 2 x 2/3 Two Studs and Curved Slope End Olive Green Part 47457 Element 6073984 ×1

Tan 1 piece

  • Plate Round Half 4 x 8 Tan Part 22888 Element 6123812 ×1

Trans-Orange 1 piece

  • Brick Round 2 x 2 with Axle Hole Trans-Orange Part 3941 Element 6514283 or 6273154 ×1

Minifigures 2 figures

  • Eyezor - Legacy Minifigure, checked as a whole figure ×1
  • Jay in Rebooted Outfit with Head Wrap (Legacy) Minifigure, checked as a whole figure ×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

Buy the piece

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.

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