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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.

Checking

42064 Ocean Explorer

1,327 pieces in 165 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.

Every bag and the box. Shake out each bag, check its corners and seams, and look inside the empty box.
Inside what you have built. Small pieces lodge inside tubes, under plates and between studs. Turn the model over and look.
The last few steps. Compare each recent step with its parts callout. A piece used in the wrong place earlier leaves you one short later.
Look-alike colors. 2 parts in this set come in two colors that are easy to mix up; they are listed below.
The spare pieces. This set comes with 31 spare pieces, marked on each row of the checklist. One may be the piece you need.
The floor and your building area. Check under furniture, the chair and the edges of your building surface.

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 Beam 1 x 7 Thick Black ×3 Dark Bluish Gray ×3 Black is darker than Dark Bluish Gray.
Technic Beam 3 x 5 L-Shape Thick Black ×14 Dark Bluish Gray ×1 Black is darker than Dark Bluish Gray.

Piece checklist

Technic Bushes 41 pieces

Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 3 spares in the box ×21
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 3 spares in the box ×20

Bricks Round and Cones 17 pieces

Brick Round 2 x 2 with Axle Hole Blue Part 3941 Element 614373 or 614323 ×4
Cone 1 x 1 [Top Groove] Trans-Orange Part 59900 Element 6514017 or 6172233 ×1
Brick Round 2 x 2 Dome Top, Hollow Stud White Part 30367c Element 4216652 or 4124120 ×4
Brick Round 2 x 2 Dome Top, Hollow Stud Yellow Part 30367c Element 4216656 ×2
Brick Round 2 x 2 x 1 1/3 Inverted Yellow Part 24947 Element 6145704 ×2
Brick Round 2 x 2, Pin Holes Yellow Part 17485 Element 6378132 or 6102524 ×4

Plates 16 pieces

Plate 2 x 2 Black Part 3022 Element 302226 ×3
Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×4
Plate 1 x 4 White Part 3710 Element 6552108 or 6548266 ×2
Plate 2 x 2 White Part 3022 Element 6552099 or 6548260 ×1
Plate 2 x 4 White Part 3020 Element 6552098 or 302001 ×6

Plates Round Curved and Dishes 14 pieces

Plate Round 1 x 1 with Solid Stud Red Part 6141 Element 614121 1 spare in the box ×4
Plate Round 1 x 1 with Solid Stud Trans-Clear Part 6141 Element 6514052 or 6240030 1 spare in the box ×2
Plate Round 1 x 1 Swirled Top White Part 15470 Element 6424009 or 6102794 1 spare in the box ×1
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) White Part 4032a Element 6601914 or 403201 ×2
Plate Round 2 x 2 with Rounded Bottom [Boat Stud] White Part 2654 Element 6601843 or 6552259 ×1
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Yellow Part 4032a Element 403224 ×4

Wheels and Tyres 10 pieces

Tyre 14 x 6 Solid Smooth Black Part 50951 Element 4246901 ×5
Wheel 11 x 8 with Center Groove Light Bluish Gray Part 42610 Element 4211758 ×5

Bars, Ladders and Fences 8 pieces

Bar 1L with Clip [Cut Edges and One Side Hole] [Gap in Clip] Black Part 48729b Element 6278152 or 6037347 1 spare in the box ×4
Bar 4L (Lightsaber Blade / Wand) Black Part 30374 Element 6116604 or 4140303 ×4

Bricks Sloped 8 pieces

Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / Grate Dark Bluish Gray Part 61409 Element 4540386 or 4521185 ×6
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Green Part 54200 Element 6245270 or 4244573 1 spare in the box ×1
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Red Part 54200 Element 6245252 or 4244363 1 spare in the box ×1

Tiles Special 8 pieces

Tile Special 1 x 1 with Clip with Rounded Edges Black Part 15712 Element 6335388 or 6066102 ×8

Hinges, Arms and Turntables 6 pieces

Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 9 Teeth Black Part 30553 Element 4143372 ×4
Hinge Cylinder 1 x 2 Locking with 1 Finger and Axle Hole On Ends Dark Bluish Gray Part 30552 Element 4210694 ×2

Tiles 5 pieces

Tile 1 x 2 with Groove White Part 3069b Element 6548264 or 306901 ×2
Tile 1 x 4 with Groove White Part 2431 Element 6548255 or 243101 ×2
Tile 1 x 8 with Groove White Part 4162 Element 6552110 or 416201 ×1

Tiles Round and Curved 5 pieces

Tile Round 1 x 1 with Black Coin Print with 5 Mark Flat Silver Part 98138pr0024 Element 6322903 or 6078241 1 spare in the box ×1
Tile Round 1 x 1 Orange Part 98138 Element 6284582 or 6009459 1 spare in the box ×4

Supports, Girders and Cranes 4 pieces

Support 1 x 6 x 10 Girder Triangular White Part 64449 Element 6117017 ×2
Crane Harbor Derrick 16 with Double Attachment Yellow Part 59807 Element 6160907 or 6103993 ×2

Technic Beams Special 4 pieces

Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] Light Bluish Gray Part 14720 Element 6055519 ×2
Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick Light Bluish Gray Part 64179 Element 4539880 ×2

Technic Steering, Suspension and Engine 4 pieces

Technic Universal Joint 3L [Complete Assembly] Light Bluish Gray Part 61903 Element 6335279 or 6321309 ×4

Transportation - Sea and Air 4 pieces

Propeller 3 Blade 3 Diameter with Axle Cross Black Part 6041 Element 604126 ×3
Boat, Mast 2 x 2 x 3 Inclined with Stud on Top and Two Sides White Part 4289 Element 6108866 or 4253859 ×1

String, Bands and Reels 3 pieces

String with End Studs 11L Overall Black Part 14226c11 Element 6096955 or 6037558 1 spare in the box ×3

Technic Special 3 pieces

Technic Rotor Blade Small with Hole and Axle Connector End Dark Bluish Gray Part 99012 Element 6271639 or 4651820 ×3

Windscreens and Fuselage 3 pieces

Windscreen 4 x 4 x 5 Cone with Pins Red Part 18591 Element 6171019 ×1
Windscreen 4 x 4 x 1 2/3 Canopy Half Sphere with Handle Trans-Clear Part 18990 Element 6514145 or 6244781 ×2

Minifig Shields, Weapons, & Tools 2 pieces

Weapon Sword / Foil / Épée Flat Silver Part 93550 Element 6222063 or 4618270 2 spares in the box ×2

Stickers 1 piece

Sticker Sheet for Set 42064-1 [No Color/Any Color] Part 31833 Element 6179459 ×1

Technic Bricks 1 piece

Technic Brick 1 x 4 [3 Pin Holes] White Part 3701 Element 6601913 or 370101 ×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.

LEGO Missing Piece Checker

42064 Ocean Explorer

Before you call it missing

Look-alike colors in this set

Your missing list

Piece checklist

Technic Pins 521 pieces

Technic Beams 243 pieces

Technic Connectors 190 pieces

Technic Axles 111 pieces