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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

45401 BricQ Motion Essential

523 pieces in 155 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. Compare each color with the step's parts callout, especially White against Trans-Clear.
The spare pieces. Many sets include a few extra small pieces. Check them before you order a replacement.
The floor and your building area. Check under furniture, the chair and the edges of your building surface.

Piece checklist

Technic Pins 44 pieces

Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 ×24
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Red Part 32054 Element 4140806 or 4125198 ×6
Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×8
Technic Pin Long without Friction Ridges, with Anti-Roll Notch Tan Part 39888 Element 6321305 ×6

Tiles 42 pieces

Tile 8 x 16 with Bottom Tubes Black Part 90498 Element 4603646 ×3
Tile 1 x 8 with 1 to 8 Measuring Chart Print Dark Azure Part 4162pr0073 Element 6299932 ×5
Tile 1 x 2 with Groove Dark Purple Part 3069b Element 4613192 ×4
Tile 2 x 4 with Groove Dark Purple Part 87079 Element 6167472 ×4
Tile 1 x 4 with Groove Medium Azure Part 2431 Element 4624705 ×2
Tile 2 x 2 with Groove Medium Azure Part 3068b Element 6060857 ×8
Tile 1 x 2 with Broken Arrow Long Yellow with Black Border Print White Part 3069bpr0206 Element 6194502 ×4
Tile 2 x 4 with Groove White Part 87079 Element 6548271 or 4560178 ×10
Tile 1 x 6 with Groove Yellow Part 6636 Element 6388488 or 663624 ×2

Technic Axles 40 pieces

Technic Axle 16 Black Part 50451 Element 6317564 or 6043747 ×4
Technic Axle 8 Black Part 3707 Element 370726 ×5
Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×5
Technic Axle 12 Red Part 3708 Element 6147702 or 4125190 ×5
Technic Axle 2 Notched Red Part 32062 Element 4142865 ×8
Technic Axle 3 Yellow Part 4519 Element 6130007 ×8
Technic Axle 9 Yellow Part 60485 Element 6130010 ×5

Wheels and Tyres 37 pieces

Tyre 17.5 x 6 with Shallow Staggered Treads and Middle Band Black Part 92409 Element 4617848 ×5
Tyre 30.4 x 14 Offset Tread [Centre Band] Black Part 92402 Element 4619323 ×5
Tyre 43.2 x 14 Offset Tread Black Part 56898 Element 6518544 or 4539268 ×5
Wheel Centre Small with Stub Axles (Pulley Wheel) Dark Bluish Gray Part 3464 Element 6005463 ×2
Wheel 11 x 8 with Center Groove Light Bluish Gray Part 42610 Element 4211758 ×5
Wheel 18 x 8 with Fake Bolts and Deep Spokes with Inner Ring Red Part 13971 Element 6048859 ×5
Wheel 30 x 14 White Part 56904 Element 4539270 ×5
Wheel 18 x 14 with Pin Hole, Fake Bolts and Shallow Spokes Yellow Part 55981 Element 6109681 or 4490142 ×5

Technic Bricks 34 pieces

Technic Brick 1 x 8 [7 Pin Holes] Dark Azure Part 3702 Element 6284131 ×6
Technic Brick 4 x 6 with 2 x 4 Opening Dark Azure Part 32531 Element 6185546 ×3
Technic Brick 1 x 16 [15 Pin Holes] Lime Part 3703 Element 6132379 ×6
Technic Brick 1 x 4 [3 Pin Holes] Lime Part 3701 Element 6132373 or 4166527 ×4
Technic Brick 1 x 12 [11 Pin Holes] Red Part 3895 Element 389521 ×2
Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Red Part 32064a Element 6196217 or 4513987 ×4
Technic Brick 1 x 2 [1 Pin Hole] White Part 3700 Element 6619284 or 370001 ×4
Technic Brick 6 x 8 with 4 x 6 Opening White Part 32532 Element 6421514 or 6021763 ×1
Technic Brick 1 x 6 [5 Pin Holes] Yellow Part 3894 Element 389424 ×4

Bricks Special 23 pieces

Brick Special 2 x 6 x 2 Weight with Sealed Bottom and Dimples on Ends Black Part 73090b Element 6094053 or 73843 ×2
Brick Special 1 x 2 x 2 with Photo Clip Light Aqua Part 37452 Element 6290244 ×2
Brick Special 2 x 4 with Pins Light Bluish Gray Part 6249 Element 6356158 or 4211676 ×2
Brick Special 2 x 2 with Pin and Axle Hole Red Part 6232 Element 6347696 or 623221 ×5
Brick Special 2 x 4 with 3 Axle Holes Red Part 39789 Element 6244918 ×4
Brick Special 2 x 2 with 2 Pins and Axle Hole White Part 30000 Element 6356180 or 6035762 ×2
Brick Special 2 x 4 with 3 Axle Holes Yellow Part 39789 Element 6244914 ×6

Technic Connectors 20 pieces

Technic Pin Connector Round [Slotted] Bright Green Part 62462 Element 6173135 or 6097400 ×4
Technic Axle and Pin Connector Angled #6 - 90° Light Bluish Gray Part 32014 Element 6268924 or 4509886 ×5
Technic Pin Connector Plate 1 x 2 x 1 2/3 [Two Holes On Top] Red Part 32530 Element 4207715 or 3253021 ×2
Technic Axle Connector Smooth [with x Hole + Orientation] White Part 59443 Element 6212049 ×4
Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole White Part 32184 Element 6276981 or 6114940 ×2
Technic Axle and Pin Connector Angled #2 - 180° Yellow Part 32034 Element 6344325 or 6210804 ×3

Tiles Special 20 pieces

Tile Special Round 2 x 2 with Hole Black Part 15535 Element 6143850 ×4
Tile Special 2 x 2 Inverted White Part 11203 Element 6564913 or 6013866 ×8
Tile Special 2 x 2 with Top Pin [Squared Holes] White Part 49153 Element 6313138 ×8

Technic Gears 17 pieces

Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×3
Technic Gear 36 Tooth Double Bevel Black Part 32498 Element 4255563 or 4177434 ×3
Technic Gear 28 Tooth Double Bevel Light Bluish Gray Part 46372 Element 6259270 ×3
Technic Gear Rack 1 x 4 Light Bluish Gray Part 3743 Element 6457283 or 4211450 ×5
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] Tan Part 18575 Element 6346517 or 6084724 ×3

Plates Round Curved and Dishes 15 pieces

Plate Round 1 x 1 with Solid Stud Dark Purple Part 6141 Element 4566522 ×6
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Dark Purple Part 4032a Element 6030534 ×4
Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Red Part 2654 Element 4617080 or 4278275 ×5

Minifig Accessories 13 pieces

Equipment Camera Handheld with Central Viewfinder Black Part 30089b Element 6476480 or 4106552 ×1
Equipment Radio / Boom Box with Handle and Black Trim Print Light Bluish Gray Part 93221pr0003 Element 6525760 or 6138216 ×1
Sports Ski 6L Medium Azure Part 90509 Element 6170544 or 6088558 ×2
Equipment Trophy Cup Small Pearl Gold Part 10172 Element 6181575 or 6100303 ×2
Sports Basketball Net with Axle White Part 11641 Element 6269072 or 6150166 ×1
Sports Hockey Stick, Round Shaft White Part 64000 Element 6276148 ×4
Sports Tennis Racket - Round Holes White Part 53019 Element 6263451 ×2

Bricks Curved 12 pieces

Brick Curved Inverted 2 x 2 x 2/3 Black Part 32803 Element 6211476 ×4
Brick Curved 3 x 1 No Studs Dark Purple Part 50950 Element 6103449 or 4578772 ×2
Brick Curved 4 x 1 Double, No Studs Dark Purple Part 93273 Element 6069012 ×2
Brick Curved 2 x 2 x 2/3 Red Part 15068 Element 6105976 ×4

Technic Bushes 12 pieces

Technic Bush Red Part 3713 Element 6271820 or 4227155 ×12

Bricks Sloped 11 pieces

Brick Sloped 10° 6 x 8 Black Part 4515 Element 6440324 or 4161067 ×1
Brick Sloped 33° 3 x 2 Dark Purple Part 3298 Element 6055875 or 4224864 ×2
Brick Sloped 65° 2 x 2 x 2 with Bottom Tube Lime Part 3678b Element 6251847 or 4212627 ×4
Brick Sloped 45° 2 x 2 Medium Azure Part 3039 Element 6173655 ×2
Brick Sloped Inverted 45° 2 x 1 Yellow Part 3665 Element 366524 ×2

Hinges, Arms and Turntables 10 pieces

Turntable 2 x 2 Female White Part 27448 Element 6536567 or 6238334 ×5
Turntable 4 x 4 Square Base, Locking White Part 61485 Element 6619301 or 4611927 ×5

Technic Beams 10 pieces

Technic Beam 1 x 7 Thick Bright Green Part 32524 Element 6097392 ×4
Technic Beam 3 x 5 L-Shape Thick Dark Azure Part 32526 Element 6211951 ×2
Technic Beam 1 x 5 Thick Yellow Part 32316 Element 4142133 or 4128590 ×2
Technic Beam 3 x 3 T-Shape Thick Yellow Part 60484 Element 6072627 ×2

Bricks 8 pieces

Brick 2 x 6 Black Part 2456 Element 4181144 or 245626 ×2
Brick 1 x 4 Medium Azure Part 3010 Element 6603319 or 6036238 ×2
Brick 1 x 2 x 5 with Hollow Studs White Part 2454b Element 6619280 or 245401 ×2
Brick 1 x 2 x 2 with Inside Stud Holder Yellow Part 3245c Element 4121625 ×2

Minifig Headwear 8 pieces

Hair Coiled Texture [Plain] Black Part 21778 Element 6122096 ×1
Hair Coiled and Short Black Part 36060 Element 6438933 or 6213798 ×1
Hair Ponytail and Swept Sideways Fringe Dark Azure Part 87990 Element 6194444 or 6152438 ×1
Hair and Hat / Cap, Ponytail Reddish Brown Print Red Part 35660pat0001 Element 6223059 ×1
Helmet, Sports [Plain] White Part 93560 Element 6252744 ×2
Helmet, Sports, with Vent Holes [Plain] White Part 46303 Element 6139552 or 4198170 ×2

Bricks Round and Cones 6 pieces

Brick Round 2 x 2 Sphere with Stud [Plain] Black Part 20953 Element 6221776 ×2
Brick Round 2 x 2 with Axle Hole Dark Azure Part 3941 Element 6229071 ×4

Transportation - Land 6 pieces

Wheel Holder, Plate, Round 2 x 2 Thin with Clips Light Bluish Gray Part 2655 Element 6152344 or 4211373 ×2
Seat / Chair 2 x 2 with Center Sprue Mark Yellow Part 4079b Element 407924 ×2
Steering Stand 1 x 2 with Black Steering Wheel Yellow Part 3829c01 Element 9553 ×2

Tiles Round and Curved 5 pieces

Tile Round 2 x 2 with Pepperoni Pizza Print Tan Part 14769pr1070 Element 6174830 ×2
Tile Round 2 x 2 with Eye, Blue Iris, Black Pupil Print White Part 14769pr1116 Element 6545236 or 6252746 ×3

Bars, Ladders and Fences 4 pieces

Antenna 1 x 4 with Flat Top Black Part 3957b Element 395726 ×2
Bar 3L with Handle, Stop Ring and Side Stops (Minifig Ski Pole) Sand Green Part 90540 Element 6233298 ×2

Minifig Heads 4 pieces

Minifig Head Jack Davids / Bolobo, Eyebrows, Scar on Cheek, Smile with Teeth / Angry with Teeth Print Yellow Part 3626cpr3136 Element 6289265 ×1
Minifig Head Peach, Glasses Light Blue with Black Frame, Peach Lips, Closed Mouth Smile Print Yellow Part 3626cpr2109 Element 6174454 ×1
Minifig Head Sally, Girl, Eyelashes, Freckles, Smile Yellow Part 3626cpr1635 Element 6178367 or 6105708 ×1
Minifig Head, Brown Eyebrows, Open Mouth Smile with White Teeth and Red Tongue Print Yellow Part 3626cpr9950 Element 6218234 ×1

Minifig Lower Body 4 pieces

Hips and Black Legs Black Part 970c03 Element 4569093 or 73407 ×1
Hips and Dark Bluish Gray Legs Dark Bluish Gray Part 970c12 Element 6168713 or 4570433 ×1
Hips and Red Legs Red Part 970c22 Element 6006024 or 4582576 ×1
Hips and White Legs White Part 970c27 Element 6551364 or 4570434 ×1

Minifig Upper Body 4 pieces

Torso, Hoodie with Zipper over Lime and Green Striped Shirt Print, Dark Azure Arms, Yellow Hands Dark Azure Part 973c04h01pr3431 Element 6153138 ×1
Torso, Tracksuit Jacket, Zipper across Belly, Pocket Print, Red Arms, Yellow Hands Red Part 973c22h01pr4786 Element 6270336 ×1
Torso, Tank Top with Rainbow Stars Print, Yellow Arms and Hands White Part 973c01h01pr1480 Element 6157857 or 4549988 ×1
Torso, Vest with Surfer Print, Yellow Arms and Hands White Part 973c01h01pr1720 Element 4612153 ×1

Supports, Girders and Cranes 4 pieces

Support 1 x 6 x 10 Girder Triangular Yellow Part 64449 Element 6252054 or 4539437 ×2
Support 2 x 2 x 13 with 5 Pin Holes Yellow Part 91176 Element 6072694 ×2

Animals / Creatures 3 pieces

Animal, Dog, Alsatian / German Shepherd (Police Dog) with Black Eyes and Forehead Print Medium Nougat Part 92586pr0001 Element 4614195 ×1
Animal, Dog, Husky with Black Eyes, Black Nose Print and Marbled Dark Bluish Gray Ears and Back Pattern White Part 16606pat0001pr0001 Element 6076467 ×1
Animal, Rabbit / Bunny with Black Eyes and Mouth - Pink Nose Print White Part 29685pr0001 Element 6461276 or 6254176 ×1

String, Bands and Reels 3 pieces

String with End Studs 41L Overall Black Part 14226c41 Element 6096957 or 6074034 ×3

Technic Beams Special 3 pieces

Technic Beam 3 x 0.5 Liftarm with Boss and Blocked, Squared Pin Hole Light Bluish Gray Part 61408 Element 6331859 ×3

Technic Steering, Suspension and Engine 3 pieces

Technic Shock Absorber 6.5L with Soft Spring, Standard Coil [Complete Assembly] Light Bluish Gray Part 76138 Element 6027565 or 4265688 ×3

Containers 2 pieces

Barrel Half Large with Axle Hole Light Bluish Gray Part 64951 Element 6262086 ×1
Box / Crate with Handholds 3 x 4 x 1 2/3 Yellow Part 30150 Element 4599378 ×1

Flags, Banners and Signs 2 pieces

Flag 2 x 2 Square with Chequered Print [Thick Clips] White Part 11055pr0002 Element 6415719 or 6294458 ×2

Technic Special 2 pieces

Technic Tooth 1 x 3 with Axle Hole [Hollow Underside] Red Part 48267 Element 6285599 ×2

Minifig Hipwear 1 piece

Minifig Hipwear Ruffled Ballerina Tutu [Plain] White Part 24087 Element 6460676 or 6402742 ×1

Minifig Shields, Weapons, & Tools 1 piece

Tool Screwdriver and Spanner / Wrench Flat Silver Part 4006 Element 6167576 ×1

Plants & Trees 1 piece

Plant, Apple Red Part 33051 Element 6054438 or 4119487 ×1

Stickers 1 piece

Sticker Sheet for Set 45401-1 [No Color/Any Color] Part 67969 Element 6300581 ×1

Tools 1 piece

Brick and Axle Separator v2.0 Dark Turquoise Part 96874 Element 6254100 ×1

Windscreens and Fuselage 1 piece

Windscreen 2 x 4 x 2 Trans-Light Blue Part 3823 Element 6581802 or 6253682 ×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.