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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.

City Alarm

Checking

3865 City Alarm

247 pieces in 83 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.

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.

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Piece checklist

Plates Special 69 pieces

  • Plate Special 1 x 2 with 1 Stud with Groove (Jumper) Black Part 3794b Element 379426 ×11
  • Plate Special 1 x 2 with 1 Stud with Groove (Jumper) Blue Part 3794b Element 379423 ×3
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Light Bluish Gray Part 87580 Element 6126082 or 4565393 ×40
  • Plate Special 4 x 6, Studs on 3 Edges Light Bluish Gray Part 6180 Element 4211838 ×1
  • Plate Special 1 x 2 with 1 Stud with Groove (Jumper) Red Part 3794b Element 379421 ×2
  • Plate Special 1 x 1 with Tooth White Part 49668 Element 6601935 or 4224792 ×2
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) White Part 87580 Element 6550157 or 6126046 ×8
  • Plate Special 1 x 2 with 1 Stud with Groove (Jumper) Yellow Part 3794b Element 379424 ×2

Plates 65 pieces

  • Plate 2 x 2 Black Part 3022 Element 302226 ×9
  • Plate 16 x 16 Bright Green Part 91405 Element 4611777 ×1
  • Plate 6 x 16 Dark Bluish Gray Part 3027 Element 4226358 ×1
  • Plate 1 x 2 Green Part 3023 Element 302328 ×12
  • Plate 4 x 4 Green Part 3031 Element 4243821 or 4113158 ×3
  • Plate 1 x 2 Red Part 3023 Element 302321 ×3
  • Plate 2 x 4 Red Part 3020 Element 302021 ×1
  • Plate 2 x 4 Reddish Brown Part 3020 Element 4211186 ×6
  • Plate 2 x 2 Tan Part 3022 Element 4114084 or 302205 ×3
  • Plate 2 x 2 Corner Tan Part 2420 Element 4114077 or 242005 ×3
  • Plate 1 x 1 Trans-Clear Part 3024 Element 6513962 or 6252041 ×4
  • Plate 1 x 2 Trans-Clear Part 3023 Element 6514001 or 6240204 ×16
  • Plate 1 x 1 Trans-Dark Blue Part 3024 Element 6513965 or 6252044 ×1
  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×2

Tiles 32 pieces

  • Tile 1 x 2 with '100' Banknote Print Green Part 3069bpr0100 Element 4295260 or 82317 ×13
  • Tile 1 x 2 with Groove Red Part 3069b Element 4178178 or 306921 ×3
  • Tile 1 x 2 with 'POLICE' White on Blue Background Print White Part 3069bpr0115 Element 4598827 ×2
  • Tile 1 x 2 with Mail Envelope, Letter, Address and Red Stamp Print White Part 3069bpr0099 Element 4521848 or 80170 ×1
  • Tile 2 x 2 with 1 Black Dot Print White Part 3068bpr0181 Element 4594374 ×1
  • Tile 2 x 2 with 2 Black Dots Print White Part 3068bpr0142 Element 4540383 ×1
  • Tile 2 x 2 with 2 Stacks of '100' Banknotes Print White Part 3068bpr0205 Element 4662232 ×2
  • Tile 2 x 2 with 3 Black Dots Print White Part 3068bpr0143 Element 4540387 ×1
  • Tile 2 x 2 with 4 Black Dots Print White Part 3068bpr0144 Element 4540388 ×1
  • Tile 2 x 2 with 5 Black Dots Print White Part 3068bpr0145 Element 4540391 ×1
  • Tile 2 x 2 with 6 Black Dots Print White Part 3068bpr0148 Element 4556011 ×1
  • Tile 2 x 2 with Helicopter Print White Part 3068bpr0203 Element 4662229 ×1
  • Tile 2 x 2 with Helicopter and Stack of '100' Banknotes Print White Part 3068bpr0204 Element 4662231 ×3
  • Tile 2 x 2 with Train in Tunnel Print White Part 3068bpr0210 Element 4659034 ×1

Bricks 29 pieces

  • Brick 1 x 2 Black Part 3004 Element 300426 ×2
  • Brick 2 x 2 Black Part 3003 Element 4103587 or 300326 Also in Dark Bluish Gray ×1
  • Brick 2 x 4 Black Part 3001 Element 300126 ×1
  • Brick 2 x 2 Dark Bluish Gray Part 3003 Element 4211060 Also in Black ×2
  • Brick 2 x 2 Dark Tan Part 3003 Element 4497068 or 4255416 ×8
  • Brick 1 x 1 Reddish Brown Part 3005 Element 4211242 ×1
  • Brick 1 x 2 without Bottom Tube Trans-Brown Part 3065 Element 6514267 or 6244909 ×4
  • Brick 1 x 2 without Bottom Tube Trans-Clear Part 3065 Element 6514262 or 6244904 ×2
  • Brick 2 x 2 without Inside Ridges Trans-Dark Blue Part 6223 Element 6514091 or 6238043 ×1
  • Brick 1 x 3 White Part 3622 Element 6550143 or 362201 ×3
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×2
  • Brick 1 x 6 White Part 3009 Element 6552097 or 6548259 ×1
  • Brick 2 x 2 White Part 3003 Element 6552095 or 6548256 ×1

Bricks Special 16 pieces

  • Brick Special 1 x 1 with Stud on 1 Side Black Part 87087 Element 4558954 ×6
  • Die - 6 Sided Rubber Frame with Red Centre Studs (Board Games) Black Part 64776pat0001 Element 4539364 ×1
  • Brick Special 1 x 1 Studs on 4 Sides Dark Bluish Gray Part 4733 Element 4210700 ×1
  • Brick Special 1 x 2 with Groove Red Part 4216 Element 6097383 or 4501560 ×2
  • Brick Special 1 x 2 with Grille Reddish Brown Part 2877 Element 4223303 ×1
  • Brick Special 1 x 1 with Headlight White Part 4070 Element 6548267 or 407001 ×3
  • Brick Special 1 x 1 with Headlight Yellow Part 4070 Element 407024 ×2

Bricks Round and Cones 6 pieces

  • Brick Round 2 x 2 Dome Top, Blocked Open Stud, Bottom Axle Holder Dark Bluish Gray Part 30367b ×1
  • Brick Round 2 x 2 with Axle Hole Red Part 3941 Element 614321 or 394121 ×1
  • Cone 1 x 1 [Top Groove] Reddish Brown Part 59900 Element 4529242 ×2
  • Brick Round 2 x 2 with Axle Hole Trans-Yellow Part 3941 Element 6514285 or 6273155 ×1
  • Brick Round 2 x 2 with Axle Hole White Part 3941 Element 6601920 or 614351 ×1

Bricks Sloped 6 pieces

  • Brick Sloped 45° 2 x 1 Triple with Ovoid Bottom Pin Black Part 3048c Element 304826 ×1
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Red Part 54200 Element 5074621 or 4504379 1 spare in the box ×3
  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Brown Part 54200 Element 6245263 or 4244368 1 spare in the box ×1
  • Brick Sloped Inverted 45° 2 x 1 White Part 3665 Element 6552106 or 366501 ×1

Minifigs 6 pieces

  • Microfig Police Officer Print Black Part 85863pr0087 Element 6020809 or 4656046 ×2
  • Microfig Thief / Criminal Print White Part 85863pr0088 Element 4656047 ×4

Minifig Accessories 3 pieces

  • Equipment Zip Line Handle Dark Bluish Gray Part 30229 Element 4211081 ×1
  • Food Croissant - Rounded Ends Dark Orange Part 33125 Element 4273743 ×1
  • Equipment Cup / Mug [Plain] Red Part 3899 Element 389921 ×1

Plates Wedged 3 pieces

  • Wedge Plate 3 x 2 Right Blue Part 43722 Element 4498155 or 4280149 ×1
  • Wedge Plate 6 x 12 Left Blue Part 30355 Element 6097701 or 4647544 ×1
  • Wedge Plate 6 x 12 Right Blue Part 30356 Element 6097697 or 4647545 ×1

Technic Special 3 pieces

  • Technic Ball Joint Lime Part 32474 Element 4624381 or 4290718 ×3

Bars, Ladders and Fences 2 pieces

  • Antenna 1 x 4 with Flat Top Black Part 3957b Element 395726 ×1
  • Fence Spindled 1 x 4 x 2 [2 Top Studs] Black Part 30055 Element 4185652 or 3005526 ×1

Tiles Special 2 pieces

  • Tile Special 1 x 2 Grille with Bottom Groove Black Part 2412b Element 241226 ×1
  • Tile Special 1 x 1 with Clip with Rounded Tips White Part 12825 Element 6030716 ×1

Rock 1 piece

  • Rock 1 x 1 Jewel / Gem 24 Facet Trans-Red Part 30153 Element 6513969 or 6247785 ×1

Technic Pins 1 piece

  • Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 1 spare in the box ×1

Tiles Round and Curved 1 piece

  • Tile Round 2 x 2 with Pizza Print Yellow Part 4150pr0015 Element 81867 ×1

Tools 1 piece

  • Brick and Axle Separator v2.0 Orange Part 96874 Element 6240515 or 4654448 ×1

Transportation - Sea and Air 1 piece

  • Propeller 3 Blades 5 Diameter, Pin Hole Black Part 92842 Element 6360206 or 4599984 ×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.

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