BlockTalk Find Your Set

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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.

Auto Chassis

Checking

853 Auto Chassis

608 pieces in 87 part and color combinations.

LEGO counts 601 pieces. This inventory comes from a separate parts catalog and lists 608; the two do not always count the same elements, so their totals differ. 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.

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Piece checklist

Red 205 pieces

  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×9
  • Brick 1 x 4 Red Part 3010 Element 301021 ×6
  • Brick 1 x 8 Red Part 3008 Element 300821 ×5
  • Brick 2 x 2 without Inside Ridges Red Part 3003a ×4
  • Brick Sloped 45° 2 x 1 without Bottom Pin Red Part 3040a ×5
  • Brick Sloped 45° 2 x 2 Red Part 3039 Element 303921 ×2
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Red Part 3660 Element 366021 ×11
  • Plate 1 x 2 Red Part 3023 Element 302321 1 spare in the box ×7
  • Plate 1 x 4 Red Part 3710 Element 371021 ×23
  • Plate 1 x 6 Red Part 3666 Element 366621 ×8
  • Plate 1 x 8 Red Part 3460 Element 346021 ×11
  • Plate 2 x 2 Red Part 3022 Element 4613974 or 302221 ×9
  • Plate 2 x 3 Red Part 3021 Element 302121 ×3
  • Plate 2 x 4 Red Part 3020 Element 302021 ×3
  • Plate 2 x 8 Red Part 3034 Element 303421 ×2
  • Plate 4 x 10 Red Part 3030 Element 4535164 or 4188302 ×2
  • Plate 4 x 4 Red Part 3031 Element 4243814 or 303121 ×1
  • Plate 4 x 6 Red Part 3032 Element 303221 ×2
  • Plate 6 x 16 Red Part 3027 Element 6104519 or 4544524 ×3
  • Technic Brick 1 x 16 [15 Pin Holes] Red Part 3703 Element 370321 ×10
  • Technic Brick 1 x 2 [1 Pin Hole] Red Part 3700 Element 370021 ×22
  • Technic Brick 1 x 4 [3 Pin Holes] Red Part 3701 Element 370121 ×11
  • Technic Brick 1 x 8 [7 Pin Holes] Red Part 3702 Element 370221 ×8
  • Technic Plate 2 x 4 [3 Holes] Red Part 3709 Element 370921 ×12
  • Technic Plate 2 x 8 [7 Holes] Red Part 3738 Element 373821 ×2
  • Tile 2 x 2 with Groove Red Part 3068b Element 306821 ×18
  • Turntable 2 x 2 Plate, Base Red Part 3680 Element 368021 ×6

Light Gray 169 pieces

  • Plate 1 x 2 Light Gray Part 3023 Element 302302 1 spare in the box ×8
  • Plate 1 x 4 Light Gray Part 3710 Element 371002 ×8
  • Plate 1 x 8 Light Gray Part 3460 Element 346002 ×8
  • Plate 2 x 2 Light Gray Part 3022 Element 302202 ×24
  • Technic Axle and Pin Connector Light Gray Part 3651 Element 4105243 or 365102 2 spares in the box ×17
  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 3 spares in the box ×16
  • Technic Engine Piston Square 2 x 2 - Old Light Gray Part 3652 Element 365202 ×4
  • Technic Gear 24 Tooth Crown with Flat Teeth Light Gray Part 3650a ×1
  • Technic Gear 24 Tooth [Old Style - Three axle holes] Light Gray Part 3648a ×12
  • Technic Gear 40 Tooth Light Gray Part 3649 Element 364902 ×1
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 ×9
  • Technic Gear Rack 1 x 4 Light Gray Part 3743 Element 374302 1 spare in the box ×3
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 1 spare in the box ×42
  • Technic Steering Pulley Large Light Gray Part 3736 Element 373602 ×1
  • Technic Universal Joint 4L [Complete Assembly] Light Gray Part 9244 Element 9244 ×5
  • Turntable 2 x 2 Plate - Top Light Gray Part 3679 Element 367952 or 367902 ×6
  • Wheel 24 x 43 Technic Light Gray Part 3739 Element 4248525 ×4

Yellow 111 pieces

  • Brick 1 x 1 Yellow Part 3005 Element 300524 ×18
  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×2
  • Brick 1 x 4 Yellow Part 3010 Element 301024 ×8
  • Brick 1 x 6 Yellow Part 3009 Element 300924 ×10
  • Brick 2 x 4 without Cross Supports Yellow Part 3001a ×2
  • Brick Sloped 45° 2 x 1 without Bottom Pin Yellow Part 3040a ×10
  • Hinge Plate 2 x 5 with Large Hole [Complete Assembly] Yellow Part 3149bc01 ×4
  • Plate 1 x 1 Yellow Part 3024 Element 302424 ×6
  • Plate 1 x 2 Yellow Part 3023 Element 302324 1 spare in the box ×17
  • Plate 1 x 4 Yellow Part 3710 Element 371024 ×5
  • Plate 1 x 6 Yellow Part 3666 Element 366624 ×2
  • Plate 1 x 8 Yellow Part 3460 Element 346024 ×2
  • Plate 2 x 3 Yellow Part 3021 Element 302124 ×10
  • Plate 2 x 4 Yellow Part 3020 Element 302024 ×2
  • Plate 4 x 4 Yellow Part 3031 Element 4243817 or 303124 ×2
  • Plate 4 x 6 Yellow Part 3032 Element 303224 ×2
  • Plate 6 x 16 Yellow Part 3027 Element 302724 ×1
  • Technic Brick 1 x 2 [1 Pin Hole] Yellow Part 3700 Element 370024 ×2
  • Technic Brick 1 x 4 [3 Pin Holes] Yellow Part 3701 Element 370124 ×2
  • Tile 1 x 2 with Groove Yellow Part 3069b Element 306924 1 spare in the box ×4

Blue 76 pieces

  • Brick 1 x 4 Blue Part 3010 Element 301023 ×6
  • Plate 1 x 1 Blue Part 3024 Element 302423 1 spare in the box ×2
  • Plate 1 x 2 Blue Part 3023 Element 302323 1 spare in the box ×25
  • Plate 1 x 4 Blue Part 3710 Element 371023 ×7
  • Plate 1 x 6 Blue Part 3666 Element 366623 ×15
  • Plate 1 x 8 Blue Part 3460 Element 346023 ×8
  • Plate 2 x 2 Blue Part 3022 Element 4613973 or 302223 ×2
  • Plate 2 x 3 Blue Part 3021 Element 302123 ×2
  • Plate 2 x 4 Blue Part 3020 Element 4240375 or 302023 ×2
  • Technic Brick 1 x 2 [1 Pin Hole] Blue Part 3700 Element 370023 ×1
  • Technic Brick 1 x 4 [3 Pin Holes] Blue Part 3701 Element 370123 ×4
  • Technic Brick 1 x 8 [7 Pin Holes] Blue Part 3702 Element 370223 ×1
  • Technic Plate 2 x 4 [3 Holes] Blue Part 3709 Element 370923 ×1

Black 47 pieces

  • Brick 1 x 4 Black Part 3010 Element 301026 ×4
  • Brick 1 x 6 Black Part 3009 Element 300926 ×4
  • Brick 1 x 8 Black Part 3008 Element 300826 ×2
  • Technic Axle 10 Black Part 3737 Element 373726 ×2
  • Technic Axle 12 Black Part 3708 Element 370826 ×3
  • Technic Axle 2 Black Part 3704 Element 370426 1 spare in the box ×9
  • Technic Axle 4 Black Part 3705 Element 370526 2 spares in the box ×12
  • Technic Axle 6 Black Part 3706 Element 370626 ×1
  • Technic Axle 8 Black Part 3707 Element 370726 ×6
  • Tyre 24 x 43 Technic Black Part 3740 Element 374026 ×4

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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