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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.

Monster Jam Dragon

Checking

42149 Monster Jam Dragon

217 pieces in 53 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.

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Piece checklist

Black 81 pieces

  • Technic Axle 12 Black Part 3708 Element 370826 ×2
  • Technic Axle and Pin Connector Perpendicular Double Split [Reinforced] Black Part 69819 Element 6349281 ×2
  • Technic Axle and Pin Connector Perpendicular Triple Black Part 63869 Element 6362991 or 6007966 ×3
  • Technic Beam 1 x 13 Thick Black Part 41239 Element 4522933 or 4164422 ×3
  • Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Black Part 60483 Element 6265091 or 6006140 ×4
  • Technic Beam 1 x 6 Thin Black Part 32063 Element 6163980 or 4114634 ×4
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Black Part 6629 Element 6279881 or 4119800 ×2
  • Technic Beam 1 x 9 Thick Black Part 40490 Element 4645732 or 4542788 ×2
  • Technic Beam 2 x 4 L-Shape Thick Black Part 32140 Element 6271825 or 4120017 ×6
  • Technic Beam 3 x 3 T-Shape Thick Black Part 60484 Element 4552347 or 4535771 ×2
  • Technic Pin Connector Round 1L [Beam] Black Part 18654 Element 6121485 1 spare in the box ×6
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [2 Lateral Holes, Small Pin Hole] Black Part 65304 Element 6321745 ×3
  • Technic Pin with Friction Ridges Lengthwise with No Center Slots Black Part 61332 Element 6279875 1 spare in the box ×38
  • Tyre 56 x 26 Balloon Black Part 55976 Element 6495636 or 4297209 ×4

Blue 31 pieces

  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×11
  • Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot Blue Part 42924 Element 6299413 ×20

Green 28 pieces

  • Technic Axle and Pin Connector Angled #1 Green Part 32013 Element 6428614 or 4199244 ×3
  • Technic Axle and Pin Connector Angled #4 - 135° Green Part 32192 Element 6420635 or 4654507 ×2
  • Technic Beam 1 x 15 Thick Green Part 32278 Element 6418453 or 6210626 ×2
  • Technic Beam 1 x 7 Thick with Alternating Holes Green Part 2391 Element 6408167 ×4
  • Technic Beam 1 x 9 Bent (6 - 4) Thick Green Part 6629 Element 6418454 or 4112283 ×2
  • Technic Beam 1 x 9 Thick Green Part 40490 Element 6115618 or 6036624 ×1
  • Technic Beam 3 x 5 L-Shape Thick Green Part 32526 Element 6013557 or 4143153 ×2
  • Technic Panel Fairing # 3 Small Smooth Long, Side A Green Part 64683 Element 6374072 or 6013553 ×2
  • Technic Panel Fairing # 4 Small Smooth Long, Side B Green Part 64391 Element 6374073 or 6013552 ×2
  • Technic Panel Fairing #10 Medium Triangle Smooth Green Part 2403 Element 6510086 or 6408170 ×1
  • Technic Panel Fairing #21 5L Small Smooth, Side B Green Part 11946 Element 6619980 or 6374530 ×1
  • Technic Panel Fairing #22 5L Small Smooth, Side A Green Part 11947 Element 6619979 or 6374074 ×1
  • Technic Panel Fairing #7 3L Very Small Smooth, Side A Green Part 2387 Element 6510990 or 6420780 ×2
  • Technic Panel Fairing #8 3L Very Small Smooth, Side B Green Part 2389 Element 6513873 or 6420781 ×2
  • Technic Panel Fairing #9 Medium Triangle Smooth Green Part 2395 Element 6510080 or 6408169 ×1

Light Bluish Gray 23 pieces

  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×4
  • Technic Axle 7 Light Bluish Gray Part 44294 Element 44294194 or 4211805 ×4
  • Technic Axle and Pin Connector Perpendicular Light Bluish Gray Part 6536 Element 6261375 or 4211775 ×2
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Light Bluish Gray Part 32184 Element 6276969 or 4211621 ×2
  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 1 spare in the box ×5
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 1 spare in the box ×4
  • Technic Pin Connector Round [Slotted] Light Bluish Gray Part 62462 Element 6173127 or 4526985 ×2

Red 22 pieces

  • Animal Body Part / Plant, Tail / Claw / Horn / Branch / Tentacle, End Section Red Part 40379 Element 6253828 or 6018583 ×2
  • Animal Body Part / Plant, Tail / Neck / Branch / Trunk, Middle Section with Pin, Square Pin Hole Red Part 51274 Element 6336922 ×2
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×6
  • Technic Pin 1/2 with Friction Red Part 89678 Element 6378120 1 spare in the box ×10
  • Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise [Centered Friction Ridge] Red Part 65487 Element 6334505 ×2

Tan 12 pieces

  • Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small Tan Part 53451 Element 6063671 1 spare in the box ×12

Dark Bluish Gray 8 pieces

  • Pullback Motor 6 x 3 x 5 Dark Bluish Gray Part 12799 Element 6143751 or 6024100 ×1
  • Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Dark Bluish Gray Part 11214 Element 6015356 ×2
  • Technic Beam 1 x 11 Thick Dark Bluish Gray Part 32525 Element 4603472 or 4534914 ×2
  • Technic Beam 1 x 7 Thick Dark Bluish Gray Part 32524 Element 4495931 or 4210752 ×2
  • Technic Pin Connector Hub with 2 Axles Dark Bluish Gray Part 27940 Element 6167281 ×1

Flat Silver 4 pieces

  • Hose, Ribbed 7mm D. 3L / 2.4cm Flat Silver Part 78c03 Element 6420614 or 6116017 ×4

Orange 4 pieces

  • Wheel 30.4 x 20 without Pinholes, with Reinforced Rim Orange Part 56145 Element 6597019 or 6207477 ×4

Yellow 3 pieces

  • Technic Axle 5 Yellow Part 32073 Element 6130008 ×3

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 42149-1 [No Color/Any Color] Part 10102450 Element 6430665 ×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.