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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

75153 AT-ST Walker

436 pieces in 164 part and color combinations, plus 3 minifigures.

The official piece count includes the 13 parts inside the set's minifigures, which this inventory lists separately. 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. 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 18 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.

Plate 2 x 10 Black ×1 Dark Bluish Gray ×4 Black is darker than Dark Bluish Gray.
Plate Special 1 x 2 with Handle on End [Closed Ends] Black ×4 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.

Piece checklist

Technic Pins 57 pieces

Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 2 spares in the box ×16
Technic Pin with Friction Ridges Lengthwise and Towball Black Part 6628 Element 4184169 or 662826 ×2
Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×10
Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 1 spare in the box ×11
Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Blue Part 6558 Element 4514553 ×4
Technic Pin 1/2 with 2L Bar Extension Light Bluish Gray Part 61184 Element 6347715 or 4520320 ×6
Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 1 spare in the box ×1
Technic Pin Double with Axle Hole Light Bluish Gray Part 32138 Element 4211888 ×1
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Light Bluish Gray Part 32054 Element 4211865 ×6

Plates Round Curved and Dishes 36 pieces

Dish 5 x 5 Dark Bluish Gray Part 6942 Element 6139805 ×2
Plate Round 1 x 1 with Solid Stud Flat Silver Part 6141 Element 4633691 3 spares in the box ×15
Dish 2 x 2 Inverted [Radar] Light Bluish Gray Part 4740 Element 4211512 ×4
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Light Bluish Gray Part 4032a Element 4211475 ×4
Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Light Bluish Gray Part 2654 Element 4278273 or 4276273 ×7
Plate Round 4 x 4 with Pin Hole Light Bluish Gray Part 60474 Element 4515351 ×1
Plate Round Corners 2 x 6 Double Light Bluish Gray Part 18980 Element 6105964 ×2
Plate Round 1 x 1 with Solid Stud Orange Part 6141 Element 4157103 1 spare in the box ×1

Tiles 27 pieces

Tile 1 x 4 with Groove Dark Bluish Gray Part 2431 Element 4211053 ×4
Tile 1 x 1 with Groove Dark Red Part 3070b Element 4550169 or 4187196 1 spare in the box ×1
Tile 1 x 1 with Groove Light Bluish Gray Part 3070b Element 4211415 1 spare in the box ×2
Tile 1 x 3 Light Bluish Gray Part 63864 Element 4558169 ×4
Tile 1 x 8 with Groove Light Bluish Gray Part 4162 Element 4211481 ×5
Tile 2 x 2 Corner Light Bluish Gray Part 14719 Element 6065824 ×2
Tile 2 x 4 with Groove Light Bluish Gray Part 87079 Element 4560183 ×5
Tile 1 x 2 with Groove Sand Blue Part 3069b Element 6142505 or 4170251 ×4

Bricks Curved 14 pieces

Brick Curved 2 x 1 No Studs [1/2 Bow] Black Part 11477 Element 6047276 ×4
Brick Curved 1 x 2 x 1 1/3 with Curved Top Light Bluish Gray Part 6091 Element 6285778 or 4211519 ×6
Brick Curved Inverted 2 x 1 Light Bluish Gray Part 24201 Element 6144138 ×4

Technic Beams 13 pieces

Technic Beam 1 x 2 Thick Black Part 43857 Element 4385726 or 4177444 ×2
Technic Beam 1 x 2 Thin Dark Bluish Gray Part 41677 Element 6338422 or 4210980 ×1
Technic Beam 1 x 7 Thick Dark Bluish Gray Part 32524 Element 4495931 or 4210752 ×1
Technic Beam 1 x 11.5 Double Bent Thick Light Bluish Gray Part 32009 Element 6271156 or 4234240 ×2
Technic Beam 1 x 2 Thick Light Bluish Gray Part 43857 Element 4211862 ×2
Technic Beam 1 x 5 Thick Light Bluish Gray Part 32316 Element 4211651 ×2
Technic Beam 1 x 9 Bent (7 - 3) Thick Light Bluish Gray Part 32271 Element 6276836 or 4211624 ×2
Technic Beam 1 x 4 Thin Yellow Part 32449 Element 6327559 or 4199345 ×1

Technic Bricks 13 pieces

Technic Brick 1 x 2 [1 Pin Hole] Black Part 3700 Element 370026 ×4
Technic Brick 1 x 2 [2 Pin Holes] Dark Bluish Gray Part 32000 Element 4210762 ×2
Technic Brick 1 x 6 [5 Pin Holes] Dark Bluish Gray Part 3894 Element 4210917 or 3894199 ×4
Technic Brick 1 x 10 [9 Pin Holes] Light Bluish Gray Part 2730 Element 4211374 ×2
Technic Brick 1 x 6 [5 Pin Holes] Light Bluish Gray Part 3894 Element 4211466 ×1

Tiles Special 13 pieces

Tile Special 1 x 2 with Handle Black Part 2432 Element 243226 ×1
Tile Special 1 x 1 with Clip with Rounded Edges Dark Bluish Gray Part 15712 Element 6344022 or 6071226 ×6
Tile Special 1 x 2 Grille with Bottom Groove Dark Bluish Gray Part 2412b Element 4210631 ×3
Tile Special 2 x 2 Inverted Dark Bluish Gray Part 11203 Element 6013082 ×2
Tile Special 1 x 1 with Clip with Rounded Edges Dark Red Part 15712 Element 6360079 or 6071222 ×1

Bricks Sloped 11 pieces

Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / Grate Dark Bluish Gray Part 61409 Element 4540386 or 4521185 ×4
Brick Sloped 18° 4 x 1 Light Bluish Gray Part 60477 Element 6013497 ×2
Brick Sloped 30° 1 x 2 x 2/3 Light Bluish Gray Part 85984 Element 4568637 ×2
Brick Sloped 65° 2 x 2 x 2 with Bottom Tube Light Bluish Gray Part 3678b Element 4234535 or 4215353 ×1
Brick Sloped Inverted 34° 3 x 1 with Internal Stopper Light Bluish Gray Part 4287b ×2

Technic Axles 10 pieces

Technic Axle 6 Black Part 3706 Element 370626 ×1
Technic Axle 3 with Stud Dark Tan Part 6587 Element 6031821 or 6013821 ×4
Technic Axle 5 with Stop Dark Tan Part 15462 Element 6055631 ×2
Technic Axle 2 Notched Red Part 32062 Element 4142865 ×2
Technic Axle 5 Yellow Part 32073 Element 6130008 ×1

Technic Beams Special 10 pieces

Technic Beam 3 x 0.5 Liftarm with Boss and Pin Semi-Reduced Black Part 33299b Element 4563044 ×2
Technic Rotation Joint Disk with Pin Hole and 3L Beam Thick Dark Bluish Gray Part 44224 Element 4182751 ×4
Technic Rotation Joint Disk with Pin and 3L Beam Thick Light Bluish Gray Part 44225 Element 6671155 or 6332151 ×4

Bars, Ladders and Fences 7 pieces

Bar 1L with Clip [Cut Edges and One Side Hole] [Gap in Clip] Dark Bluish Gray Part 48729b Element 6278155 or 4579234 1 spare in the box ×2
Bar 1L with Clip [Cut Edges and One Side Hole] [Gap in Clip] Light Bluish Gray Part 48729b Element 6278156 or 4542590 1 spare in the box ×1
Bar 3L Light Bluish Gray Part 87994 Element 6093527 or 6064033 1 spare in the box ×2
Bar 6L with Stop Ring Light Bluish Gray Part 63965 Element 6170418 or 6081975 ×2

Minifig Shields, Weapons, & Tools 7 pieces

Tool Hammer / Mallet Large Black Part 4522 Element 452226 ×2
Weapon Gun / Blaster 1 x 2 x 2/3 with Studs on Sides and Handle Black Part 15071 Element 6051527 ×1
Weapon Gun / Blaster Short (Star Wars) Black Part 58247 Element 4498713 ×1
Weapon Gun / Blaster Small (Star Wars) Black Part 92738 Element 6360207 or 4609050 ×1
Weapon Lightsaber Hilt with Bottom Ring Light Bluish Gray Part 64567 Element 4581155 or 4539481 1 spare in the box ×2

Technic Special 7 pieces

Gearbox 4 x 4 x 1 2/3 with 1 x 2 Cutouts, Pin Holes Black Part 6585 Element 6169982 or 4500902 ×1
Technic Plate 1 x 5 with Smooth Ends, 4 Studs and Centre Axle Hole Black Part 32124 Element 6280168 or 4114689 ×4
Technic Brick 1 x 2 with Hole and Dual Beam Extensions Dark Bluish Gray Part 85943 Element 6324639 or 4547958 ×2

Bricks 6 pieces

Brick 1 x 2 Light Bluish Gray Part 3004 Element 4211388 ×2
Brick 1 x 3 Light Bluish Gray Part 3622 Element 4211428 ×2
Brick 1 x 1 Trans-Brown Part 3005 Element 6329870 or 6240554 ×2

Bricks Special 6 pieces

Brick Special 1 x 1 with Headlight Black Part 4070 Element 407026 ×1
Bracket 3 x 2 x 1 1/3 with Pin Bottom Dark Bluish Gray Part 18671 Element 6099909 ×1
Brick Special 1 x 2 with Grille Dark Bluish Gray Part 2877 Element 4210636 ×1
Bracket 5 x 2 x 2 1/3 with Holes, Inside Stud Holder Light Bluish Gray Part 76766 Element 6171067 or 6012653 ×1
Brick Special 1 x 2 x 1 2/3 with 4 Studs on 1 Side Light Bluish Gray Part 22885 Element 6123809 ×2

Projectiles / Launchers 5 pieces

Launcher, Brick Special 1 x 4 Spring Shooter with Light Bluish Gray Top Dark Bluish Gray Part 15400 Element 6324200 or 6048898 ×2
Projectile, Spring Shooter Ammunition 8L Bar Trans-Red Part 15303 Element 6287550 or 6054526 ×3

Technic Connectors 5 pieces

Technic Pin Connector Hub with 1 Pin with Friction Ridges Lengthwise Black Part 15100 Element 6073231 ×2
Technic Axle and Pin Connector Perpendicular Double Dark Bluish Gray Part 32291 Element 6280395 or 4210655 ×2
Technic Axle Connector with Axle Hole Light Bluish Gray Part 32039 Element 4211553 ×1

Bricks Round and Cones 4 pieces

Brick Round 4 x 4 Centre Hole Dark Bluish Gray Part 87081 Element 4558959 ×1
Cone 1 x 1 [Top Groove] Dark Bluish Gray Part 59900 Element 4529240 ×2
Brick Round 2 x 2 [Grill] Light Bluish Gray Part 92947 Element 4650645 or 4610816 ×1

Tiles Round and Curved 4 pieces

Tile Round 2 x 2 with Bottom Stud Holder Dark Bluish Gray Part 14769 Element 6056296 or 4620079 ×3
Tile Round 1 x 1 with Thermal Detonator Print Flat Silver Part 98138pr0010 Element 6287874 or 6006541 1 spare in the box ×1

Bricks Wedged 3 pieces

Brick Wedged, Curved 3 x 4 x 2/3 Cutout Light Bluish Gray Part 11291 Element 6388353 or 6179676 ×1
Brick Wedged, Curved 6 x 4 Triple Light Bluish Gray Part 43712 Element 6101104 or 6030574 ×2

Flags, Banners and Signs 3 pieces

Road Sign Clip-on 2 x 2 Square [Thick Open O Clip] Dark Bluish Gray Part 15210 Element 6315300 or 6063616 ×3

Hinges, Arms and Turntables 3 pieces

Hinge Plate 2 x 2 Locking with 1 Finger on Top Light Bluish Gray Part 92582 Element 6265742 or 4666449 ×2
Turntable 4 x 4 Square Base, Locking Light Bluish Gray Part 61485 Element 6045718 or 4523670 ×1

Technic Steering, Suspension and Engine 3 pieces

Technic Link 1 x 6 without Stoppers Dark Bluish Gray Part 32005a Element 4629920 or 4211026 ×2
Technic Steering / CV Joint Axle Dark Bluish Gray Part 92906 Element 4610374 ×1

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

Minifig Accessories 2 pieces

Sports Roller Skate Black Part 11253 Element 6088585 or 6020265 1 spare in the box ×1
Tap 1 x 1 without Hole in Spout Red Part 4599b Element 459921 1 spare in the box ×1

Technic Gears 2 pieces

Technic Gear 12 Tooth Bevel Tan Part 6589 Element 4565452 or 4514556 ×2

Panels 1 piece

Panel 1 x 2 x 1 with Rounded Corners and Central Divider Black Part 93095 Element 6640376 or 6115086 ×1

Stickers 1 piece

Sticker Sheet for Set 75153-1 [No Color/Any Color] Part 28341 Element 6162884 or 6162883 ×1

String, Bands and Reels 1 piece

Chain 6L [5 Links] Black Part 92338 Element 6328408 or 6062698 ×1

Minifigures 3 figures

Baze Malbus with Neck Bracket Minifigure, checked as a whole figure ×1
Imperial AT-ST Driver, Helmet with Printed Goggles Minifigure, checked as a whole figure ×1
Lieutenant Sefla / Rebel Trooper 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.