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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

45400 BricQ Motion Prime

552 pieces in 136 part and color combinations, plus 4 minifigures.

LEGO counts 562 pieces. This inventory comes from a separate parts catalog and lists 568, including the 16 parts inside the minifigures; 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.

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 134 pieces

Technic Axle Pin 3L with Friction Ridges Lengthwise and 2L Axle Black Part 18651 Element 6089119 ×14
Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 ×52
Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot Blue Part 42924 Element 6299413 ×22
Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 ×10
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Red Part 32054 Element 4140806 or 4125198 ×12
Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×12
Technic Pin 3/4 Tan Part 32002 Element 6663097 or 6013938 ×6
Technic Pin Long without Friction Ridges, with Anti-Roll Notch Tan Part 39888 Element 6321305 ×6

Technic Bushes 20 pieces

Technic Bush Red Part 3713 Element 6271820 or 4227155 ×12
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 ×8

Technic Beams Special 19 pieces

Technic Rotation Joint Disk with Pin Hole and 3L Beam Thick Dark Bluish Gray Part 44224 Element 4182751 ×2
Technic Beam 3 x 0.5 Liftarm with Boss and Blocked, Squared Pin Hole Light Bluish Gray Part 61408 Element 6331859 ×2
Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] Light Bluish Gray Part 14720 Element 6055519 ×1
Technic Rotation Joint Disk with Pin and 3L Beam Thick Light Bluish Gray Part 44225 Element 6671155 or 6332151 ×2
Technic Beam Frame 7 x 11 Lime Part 39794 Element 6247432 ×2
Technic Base Frame 11 x 19 Medium Azure Part 39369 Element 6252638 ×2
Technic Beam Frame 11 x 15 Medium Azure Part 39790 Element 6245375 ×2
Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick Medium Azure Part 64179 Element 6300331 ×6

Technic Bricks 18 pieces

Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Black Part 32064a Element 6178922 or 4233487 ×6
Technic Brick 1 x 2 [1 Pin Hole] Dark Bluish Gray Part 3700 Element 4211111 ×4
Technic Brick 1 x 8 [7 Pin Holes] Red Part 3702 Element 370221 ×5
Technic Brick 1 x 6 [5 Pin Holes] Yellow Part 3894 Element 389424 ×3

Wheels and Tyres 18 pieces

Technic Wedge Belt Wheel Tire Black Part 2815 Element 6028041 or 281526 ×4
Tyre 43.2 x 14 Black Part 30699 Element 6518575 or 6182551 ×4
Technic Wedge Belt Wheel [aka Pulley] Lime Part 4185 Element 6335116 or 4494219 ×6
Wheel 30 x 14 White Part 56904 Element 4539270 ×4

Technic Gears 16 pieces

Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×5
Technic Gear 36 Tooth Double Bevel Black Part 32498 Element 4255563 or 4177434 ×3
Technic Gear Rack 1 x 13 with Axle and Pin Holes Black Part 64781 Element 6302830 or 4540906 ×1
Technic Worm Gear Short Dark Bluish Gray Part 27938 Element 6170153 ×2
Technic Gear 28 Tooth Double Bevel Light Bluish Gray Part 46372 Element 6259270 ×3
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] Tan Part 18575 Element 6346517 or 6084724 ×2

Minifig Accessories 15 pieces

Equipment Camera Handheld with Central Viewfinder Black Part 30089b Element 6476480 or 4106552 ×1
Equipment Magnifying Glass with Thick Frame, Hollow Handle, Trans-Clear Lens Pattern Black Part 38648pat0001 Element 6499140 or 6325525 ×1
Sports Snowboard Small Bright Light Orange Part 18746 Element 6105957 ×2
Equipment Sextant Dark Bluish Gray Part 30154 Element 6269999 or 4217675 ×1
Equipment Weapon, Loudhailer / Speaker / Blaster / Space Gun Dark Bluish Gray Part 4349 Element 4210698 ×1
Sports Ski 6L Medium Azure Part 90509 Element 6170544 or 6088558 ×5
Equipment Trophy Cup Small Pearl Gold Part 10172 Element 6181575 or 6100303 ×2
Equipment Cup / Mug [Plain] White Part 3899 Element 4659665 or 4548546 ×1
Sports Tennis Racket - Round Holes White Part 53019 Element 6263451 ×1

Bricks Sloped 11 pieces

Brick Sloped 33° 3 x 2 Dark Purple Part 3298 Element 6055875 or 4224864 ×2
Brick Sloped Inverted 33° 3 x 2, Connections between Studs, Ovoid Bottom Pin Red Part 3747b Element 4500462 ×2
Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Yellow Part 54200 Element 4504381 or 4283095 ×4
Brick Sloped 45° 2 x 2 Yellow Part 3039 Element 303924 ×3

Plates Special 10 pieces

Bracket 1 x 2 - 2 x 2 Black Part 44728 Element 6117973 or 6048855 ×2
Technic Plate 2 x 4 [3 Holes] Black Part 3709 Element 370926 ×4
Plate Special 1 x 2 with 1 Stud with Groove and Inside Stud Holder (Jumper) Yellow Part 15573 Element 6092583 ×4

Technic Special 10 pieces

Technic Cam Black Part 6575 Element 4143187 ×4
Technic Tooth 1 x 3 with Axle Hole [Hollow Underside] Red Part 48267 Element 6285599 ×4
Ball, Hard Plastic, 51mm (approx. 6 studs diameter) Yellow Part 41250 Element 6100937 or 4143294 ×2

Tiles Round and Curved 10 pieces

Tile Round 2 x 2 with Pepperoni Pizza Print Tan Part 14769pr1070 Element 6174830 ×1
Tile Round 1 x 1 with Squinted Eye, Center Side Pupil Print White Part 98138pr0083 Element 6329648 ×6
Tile Round 2 x 2 with Eye, Blue Iris, Black Pupil Print White Part 14769pr1116 Element 6545236 or 6252746 ×3

Bricks Special 9 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 2 x 4 with 3 Axle Holes Red Part 39789 Element 6244918 ×5
Brick Special 2 x 4 with 3 Axle Holes Yellow Part 39789 Element 6244914 ×2

Technic Panels 6 pieces

Technic Panel 3 x 11 x 1 Red Part 15458 Element 6224922 or 6064458 ×2
Technic Panel 5 x 11 x 1 White Part 64782 Element 6004135 or 4580019 ×4

Technic Steering, Suspension and Engine 6 pieces

Technic Shock Absorber 6.5L with Soft Spring, Standard Coil [Complete Assembly] Light Bluish Gray Part 76138 Element 6027565 or 4265688 ×2
Technic Universal Joint 3L [Complete Assembly] Light Bluish Gray Part 61903 Element 6335279 or 6321309 ×2
Technic Shock Absorber 6.5L with Hard Spring, Tight Coil in Middle [Complete Assembly] Yellow Part 76537 Element 7653726 or 6027566 ×2

Transportation - Sea and Air 6 pieces

Propeller 1 Blade 14L with Two Pin Holes and Four Axles White Part 89509 Element 4587185 ×6

Tiles 5 pieces

Tile 2 x 4 with Groove Red Part 87079 Element 4560179 ×2
Tile 1 x 2 with Broken Arrow Long Yellow with Black Border Print White Part 3069bpr0206 Element 6194502 ×3

Gear Parts 4 pieces

Storage Bin, Dacta, Medium [New Style] Blue Part 54187 ×1
Storage Bin Lid, Dacta [For New Style Trays] Trans-Clear Part 54190 ×1
Storage / Sorting Tray, SPIKE Prime, Upper Tray - 4 Cups [For New Style Storage Bins] White Part 902097 ×2

Minifig Headwear 4 pieces

Helmet Dirt Bike Dark Blue Part 35458 Element 6207255 ×1
Hair Short Swept Back with Sideburns and Widow's Peak Light Bluish Gray Part 21268 Element 6123037 ×1
Helmet, Sports, with Vent Holes [Plain] White Part 46303 Element 6139552 or 4198170 ×1
Hood Fur-lined, Short with Dark Azure Hood Print White Part 95678pr0006 Element 6233610 ×1

Bricks Round and Cones 3 pieces

Brick Round 2 x 2 with Axle Hole Dark Purple Part 3941 Element 4622176 ×3

Non-System Parts 3 pieces

PUNCHED FOIL ELEMENT, NO. 2 Trans-Dark Blue Part 77859 Element 6339274 ×1
PUNCHED FOIL ELEMENT, NO. 3 Trans-Dark Blue Part 77860 Element 6339276 ×1
PUNCHED FOIL ELEMENT, NO. 4 Trans-Dark Blue Part 77861 Element 6339278 ×1

Plates 3 pieces

Plate 2 x 6 Black Part 3795 Element 379526 ×3

Pneumatics 3 pieces

Pneumatic Pump 1 x 6 [V2] with Reinforced Cylinder Blue Part 26674 Element 6152131 ×1
Pneumatic Switch with Pin Holes, Axle Hole and Stepped Outlets Light Bluish Gray Part 19474 Element 6099773 ×1
Pneumatic Cylinder 2 x 11 with 2 Stepped Inlets [V2] Yellow Part 19478 Element 6156699 or 6152068 ×1

Tubes and Hoses 3 pieces

Hose, Pneumatic 4mm D. 40L / 32.0cm Black Part 5102c40 Element 6648026 or 6217915 ×1
Hose, Pneumatic 4mm D. 27L / 21.6cm Blue Part 5102c27 Element 6220989 ×1
Hose, Pneumatic 4mm D. 40L / 32.0cm Light Bluish Gray Part 5102c40 Element 6150234 or 4529105 ×1

Bars, Ladders and Fences 2 pieces

Bar 3L with Handle, Stop Ring and Side Stops (Minifig Ski Pole) Sand Green Part 90540 Element 6233298 ×2

Large Buildable Figures 2 pieces

Large Figure Weapon, Barrel with 2 Pin Holes and 3 Axle Holes Light Bluish Gray Part 98585 Element 6186129 or 6039505 ×2

Transportation - Land 2 pieces

Seat / Chair 2 x 2 with Center Sprue Mark Red Part 4079b Element 407921 ×2

Minifig Shields, Weapons, & Tools 1 piece

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

Plants & Trees 1 piece

Plant, Apple Bright Green Part 33051 Element 6413063 or 4107050 ×1

Stickers 1 piece

Sticker Sheet for Set 45400-1 [No Color/Any Color] Part 67968 Element 6300578 ×1

Tools 1 piece

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

Minifigures 4 figures

Black Torso, Lime Arms, Black Legs, Dark Blue Cap Minifigure, checked as a whole figure ×1
Black Torso, Lime Arms, Black Legs, White Helmet Minifigure, checked as a whole figure ×1
White/Orange Torso, Orange Legs, Black Hair, Goggles Minifigure, checked as a whole figure ×1
White/Orange Torso, Orange Legs, White Helmet 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.