BlockTalk Find Your Set

Free tool

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.

Challenger Set 400 with Motor

Checking

4223 Challenger Set 400 with Motor

540 pieces in 144 part and color combinations, plus 2 minifigures.

The piece count includes the 8 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.

Show

Piece checklist

Bricks 257 pieces

  • Brick 1 x 1 Black Part 3005 Element 300526 ×4
  • Brick 1 x 2 Black Part 3004 Element 300426 ×8
  • Brick 1 x 4 Black Part 3010 Element 301026 ×8
  • Brick 1 x 4 with Car Headlights and Indicators Print Black Part 3010pr9982 Element 4107875 ×1
  • Brick 1 x 4 with Car Taillights Red and Orange Print Black Part 3010pr9957 Element 4107872 ×1
  • Brick 2 x 2 Black Part 3003 Element 4103587 or 300326 ×4
  • Brick 2 x 3 Black Part 3002 Element 300226 ×2
  • Brick 2 x 4 Black Part 3001 Element 300126 ×2
  • Brick 1 x 1 Blue Part 3005 Element 300523 ×8
  • Brick 1 x 2 Blue Part 3004 Element 4613959 or 300423 ×16
  • Brick 1 x 3 Blue Part 3622 Element 362223 ×4
  • Brick 1 x 4 Blue Part 3010 Element 301023 ×14
  • Brick 1 x 6 Blue Part 3009 Element 300923 ×4
  • Brick 1 x 8 Blue Part 3008 Element 300823 ×4
  • Brick 2 x 2 Blue Part 3003 Element 4103589 or 300373 ×6
  • Brick 2 x 3 Blue Part 3002 Element 300223 ×2
  • Brick 2 x 4 Blue Part 3001 Element 300173 or 300123 ×4
  • Brick 1 x 1 Red Part 3005 Element 300521 ×6
  • Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×14
  • Brick 1 x 3 Red Part 3622 Element 362221 ×4
  • Brick 1 x 4 Red Part 3010 Element 301021 ×12
  • Brick 1 x 4 with Basic Car Headlights Print Red Part 3010pr9975 Element 80352 ×1
  • Brick 1 x 4 with Car Taillights Red and Orange Print Red Part 3010pr9957 Element 4107871 ×1
  • Brick 2 x 2 Red Part 3003 Element 4103590 or 300371 ×4
  • Brick 2 x 3 Red Part 3002 Element 300271 or 300221 ×2
  • Brick 2 x 4 Red Part 3001 Element 300121 ×4
  • Brick 1 x 2 without Bottom Tube Trans-Clear Part 3065 Element 6514262 or 6244904 ×4
  • Brick 1 x 1 White Part 3005 Element 6552096 or 6548258 ×6
  • Brick 1 x 2 White Part 3004 Element 6548257 or 4613964 ×14
  • Brick 1 x 3 White Part 3622 Element 6550143 or 362201 ×4
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×12
  • Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×2
  • Brick 2 x 2 White Part 3003 Element 6552095 or 6548256 ×4
  • Brick 2 x 3 White Part 3002 Element 6550133 or 300251 ×2
  • Brick 2 x 4 White Part 3001 Element 6552094 or 300101 ×4
  • Brick 1 x 1 Yellow Part 3005 Element 300524 ×8
  • Brick 1 x 1 with Simple Eye Black and White Print Yellow Part 3005pr9996 Element 82357 ×2
  • Brick 1 x 2 Yellow Part 3004 Element 4613966 or 300424 ×16
  • Brick 1 x 3 Yellow Part 3622 Element 362224 ×4
  • Brick 1 x 4 Yellow Part 3010 Element 301024 ×14
  • Brick 1 x 4 with Black Smile Print Yellow Part 3010pr9980 Element 82356 ×1
  • Brick 1 x 6 Yellow Part 3009 Element 300924 ×4
  • Brick 1 x 8 Yellow Part 3008 Element 300824 ×4
  • Brick 2 x 2 Yellow Part 3003 Element 4103588 or 300374 ×6
  • Brick 2 x 3 Yellow Part 3002 Element 300224 ×2
  • Brick 2 x 4 Yellow Part 3001 Element 300124 ×4

Bricks Sloped 84 pieces

  • Brick Sloped 33° 2 x 2 Double Blue Part 3300 Element 330023 ×4
  • Brick Sloped 33° 2 x 4 Double Blue Part 3299 Element 329923 ×4
  • Brick Sloped 33° 3 x 1 Blue Part 4286 Element 428623 ×2
  • Brick Sloped 33° 3 x 2 Blue Part 3298 Element 6294307 or 6141996 ×4
  • Brick Sloped 33° 3 x 4 Blue Part 3297 Element 6088711 or 329723 ×10
  • Brick Sloped Inverted 33° 3 x 2, Connections between Studs, Ovoid Bottom Pin Blue Part 3747b Element 4509443 ×2
  • Brick Sloped Inverted 34° 3 x 1 without Internal Stopper Blue Part 4287a ×4
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Blue Part 3660 Element 366023 ×4
  • Brick Sloped 33° 3 x 1 Red Part 4286 Element 428621 ×4
  • Brick Sloped 33° 3 x 2 Red Part 3298 Element 329821 ×4
  • Brick Sloped 45° 2 x 1 with Bottom Pin Red Part 3040b Element 4121934 or 304021 ×4
  • Brick Sloped 45° 2 x 2 Red Part 3039 Element 303921 ×2
  • Brick Sloped Inverted 33° 3 x 2, Connections between Studs, Ovoid Bottom Pin Red Part 3747b Element 4500462 ×4
  • Brick Sloped Inverted 45° 2 x 1 Red Part 3665 Element 366521 ×4
  • Brick Sloped 45° 2 x 2 Trans-Clear Part 3039 Element 6514100 or 6244886 ×2
  • Brick Sloped 33° 3 x 1 Yellow Part 4286 Element 428624 ×2
  • Brick Sloped 33° 3 x 2 Yellow Part 3298 Element 329824 ×4
  • Brick Sloped 45° 2 x 1 with Bottom Pin Yellow Part 3040b Element 4121965 or 304024 ×4
  • Brick Sloped 45° 2 x 2 Yellow Part 3039 Element 303924 ×4
  • Brick Sloped 45° 4 x 4 Yellow Part 30182 Element 4114030 ×2
  • Brick Sloped Inverted 33° 3 x 2, Connections between Studs, Ovoid Bottom Pin Yellow Part 3747b Element 4500459 or 374724 ×2
  • Brick Sloped Inverted 34° 3 x 1 without Internal Stopper Yellow Part 4287a ×4
  • Brick Sloped Inverted 45° 2 x 1 Yellow Part 3665 Element 366524 ×4

Plates 47 pieces

  • Plate 1 x 4 Blue Part 3710 Element 371023 ×6
  • Plate 2 x 10 Blue Part 3832 Element 383223 ×2
  • Plate 2 x 2 Blue Part 3022 Element 4613973 or 302223 ×4
  • Plate 2 x 4 Blue Part 3020 Element 4240375 or 302023 ×4
  • Plate 2 x 6 Blue Part 3795 Element 379523 ×2
  • Plate 4 x 10 Blue Part 3030 Element 303073 or 303023 ×2
  • Plate 4 x 12 Blue Part 3029 Element 4528850 or 4166870 ×1
  • Plate 4 x 4 Blue Part 3031 Element 4243815 or 303123 ×1
  • Plate 6 x 6 Blue Part 3958 Element 4199519 or 395823 ×2
  • Plate 6 x 8 Blue Part 3036 Element 303673 or 303623 ×1
  • Plate 1 x 4 Red Part 3710 Element 371021 ×2
  • Plate 2 x 10 Red Part 3832 Element 383221 ×2
  • Plate 2 x 4 Red Part 3020 Element 302021 ×2
  • Plate 2 x 6 Red Part 3795 Element 379521 ×2
  • Plate 4 x 12 Red Part 3029 Element 4514717 or 302921 ×1
  • Plate 4 x 4 Red Part 3031 Element 4243814 or 303121 ×1
  • Plate 1 x 10 Yellow Part 4477 Element 6079138 or 6078095 ×2
  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×2
  • Plate 2 x 4 Yellow Part 3020 Element 302024 ×4
  • Plate 2 x 6 Yellow Part 3795 Element 379524 ×2
  • Plate 2 x 8 Yellow Part 3034 Element 303424 ×2

Wheels and Tyres 24 pieces

  • Tyre 30 x 10.5 Offset Tread Black Part 2346 Element 234676 or 234626 ×4
  • Tyre 43 x 17 Black Part 3634 Element 4523564 or 363426 ×4
  • Tyre Offset Tread 24 x 8 Black Part 3483 Element 4501048 or 348326 ×4
  • Wheel Freestyle with 2 x 2 Studs and Pin Hole White Part 6248 Element 4144355 or 624801 ×6
  • Wheel with Split Axle hole White Part 3482 Element 4279395 or 4194244 ×6

Windows and Doors 21 pieces

  • Window 1 x 2 x 3 Shutter Blue Part 3856 Element 385623 ×8
  • Door 1 x 4 x 5 with 4 Panes, Squared Base Red Part 3861b Element 386121 ×1
  • Window 1 x 4 x 3 Red Part 3853 Element 385321 ×4
  • Window 1 x 2 x 3 Pane White Part 3854 Element 385401 ×8

Bricks Round and Cones 16 pieces

  • Brick Round 1 x 1 Open Stud Black Part 3062b Element 306226 ×6
  • Brick Round 2 x 2 with Axle Hole Red Part 3941 Element 614321 or 394121 ×4
  • Cone 1 x 1 [No Top Groove] White Part 4589 Element 458901 ×6

Hinges, Arms and Turntables 16 pieces

  • Hinge Plate 2 x 4 - Male (Digger Bucket Holder) Black Part 3315 Element 4187207 or 331526 ×1
  • Hinge Plate 2 x 5 with Large Hole [Complete Assembly] Black Part 3149bc01 Element 4161112 or 4106943 ×2
  • Hinge Brick 1 x 2 Top Plate Thin Light Gray Part 3938 Element 393802 ×4
  • Turntable 2 x 2 Plate - Top Light Gray Part 3679 Element 367952 or 367902 ×2
  • Turntable 2 x 2 Plate, Base Red Part 3680 Element 368021 ×2
  • Turntable 4 x 4 Square Base with Top, Complete Assembly Red Part 3403c01 Element 4221665 or 4143678 ×1
  • Hinge Brick 1 x 2 Base Yellow Part 3937 Element 393724 ×4

Bricks Special 14 pieces

  • Brick Special 1 x 2 with Pin Red Part 2458 Element 245821 ×4
  • Brick Special 2 x 2 with Pin and Axle Hole Red Part 6232 Element 6347696 or 623221 ×6
  • Brick Special 1 x 1 with Headlight Yellow Part 4070 Element 407024 ×4

Plates Round Curved and Dishes 8 pieces

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Blue Part 4032a Element 403223 ×8

Technic Axles 8 pieces

  • Technic Axle 10 Black Part 3737 Element 373726 ×2
  • Technic Axle 6 Black Part 3706 Element 370626 ×4
  • Technic Axle 8 Black Part 3707 Element 370726 ×2

Bars, Ladders and Fences 6 pieces

  • Lever Small Base with Yellow Lever Black Part 298c01 Element 74138 ×2
  • Fence Lattice 1 x 4 x 1 White Part 3633 Element 4550171 or 363301 ×4

Plates Special 6 pieces

  • Plate Special 1 x 2 with Ladder Black Part 4175 Element 6285241 or 6179557 ×2
  • Plate Special 2 x 2 with Towball Blue Part 3729 Element 372923 ×1
  • Plate Special 2 x 2 with Towball Socket, Short, 4 Slots Blue Part 3730 Element 4200503 or 373023 ×1
  • Bracket 2 x 2 - 2 x 2 Red Part 3956 Element 395621 ×1
  • Plate Special 3 x 2 with Rounded End, Hole Red Part 3176 Element 4188189 or 317621 ×1

Technic Bricks 6 pieces

  • Technic Brick 1 x 2 [1 Pin Hole] Red Part 3700 Element 370021 ×6

Transportation - Land 5 pieces

  • Seat / Chair 2 x 2 Black Part 4079 ×2
  • Steering Stand 1 x 2 with Black Steering Wheel Black Part 3829c01 Element 73081 ×2
  • Construction Vehicle Bucket 7 Teeth 3 x 6 with Digger Bucket Arm Connection Yellow Part 2347 Element 4187662 or 4114236 ×1

Bricks Curved 4 pieces

  • Brick Arch 1 x 6 x 2 - Thick Top with Reinforced Underside Yellow Part 3307 Element 330724 ×4

String, Bands and Reels 4 pieces

  • String Cord Thin (0.5mm) [Undetermined Length] Black Part 56823 Element 7009426 ×1
  • String Reel Winch 2 x 4 x 2 (Light Gray Drum) Red Part 73037 Element 4190523 or 4109857 ×1
  • Technic Rubber Belt Large [33mm ID] [Round Cross Section] Yellow Part 85546 Element 4544151 or 70905 ×2

Electronics 3 pieces

  • Battery Box, 9V 4 x 14 x 4 with Yellow Base [Complete Assembly] Black Part 2847c02 Element 4109814 or 75140 ×1
  • Motor, 9V 4 x 10 x 3 Black Part 5011 Element 70357 ×1
  • Wire with Brick 2 x 2 x 2/3 Pair, 162L Black Part 5306bc162 Element 75656 ×1

Plates Wedged 2 pieces

  • Wedge Plate 4 x 9 without Stud Notches Blue Part 2413 Element 241323 ×2

Transportation - Sea and Air 2 pieces

  • Propeller 3 Blade 3 Diameter with Axle Cross Black Part 6041 Element 604126 ×1
  • Propeller 4 Blade 5 Diameter with Rounded Ends, Open Hub Light Gray Part 2479 Element 247902 ×1

Windscreens and Fuselage 2 pieces

  • Windscreen 2 x 4 x 2 Trans-Clear Part 3823 Element 6581801 or 6253681 ×1
  • Windscreen 2 x 4 x 2 Vertical Trans-Clear Part 4594 Element 6507908 or 6240532 ×1

Baseplates 1 piece

  • Baseplate 16 x 32 Green Part 3857 Element 4219615 or 274828 ×1

Minifig Shields, Weapons, & Tools 1 piece

  • Tool Screwdriver with Narrow Head [6-Rib Handle] Dark Gray Part 55298 ×1

Plants & Trees 1 piece

  • Plant, Pine Tree - Small 2 x 2 x 4 Green Part 2435 Element 6268823 or 243578 ×1

Supports, Girders and Cranes 1 piece

  • Crane Hook 1 x 4 x 1 Black Part 70278 Element 70278 ×1

Tiles Special 1 piece

  • Tile Special 2 x 2 with Top Pin Red Part 2460 Element 246021 ×1

Minifigures 2 figures

  • Man - White Torso with Blue/Red Stripes, Black Legs, Red Cap Minifigure, checked as a whole figure ×1
  • Man - Blue Octan Torso, White Legs 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.

We value your privacy

We use cookies 🍪 for analytics and to improve your experience. Read our privacy policy