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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.

Sonar Security

Checking

6852 Sonar Security

55 pieces in 32 part and color combinations, plus 1 minifigure.

The official piece count includes the 6 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.

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Piece checklist

Black 32 pieces

  • Bar 1 x 3 [Clip / Anti-Stud] Black Part 4735 Element 4141580 or 473576 ×2
  • Bracket 8 x 2 x 1 1/3 Black Part 4732 Element 473226 ×1
  • Brick 2 x 2 Black Part 3003 Element 4103587 or 300326 ×1
  • Brick 2 x 4 Black Part 3001 Element 300126 ×1
  • Brick Round 2 x 2 with Axle Hole Black Part 3941 Element 614376 or 614326 ×1
  • Brick Sloped Inverted 33° 3 x 2, No Connections between Studs, Ovoid Bottom Pin Black Part 3747a ×1
  • Engine - Smooth, Small 1 x 2 Side Plate [With Axle Holders] Black Part 3475b Element 347526 ×2
  • Hinge Brick 1 x 2 Base Black Part 3937 Element 393726 ×1
  • Hinge Brick 1 x 2 Top Plate Thin Black Part 3938 Element 393826 ×1
  • Lever Small Base with Black Lever Black Part 298c02 Element 73587 1 spare in the box ×1
  • Plate 1 x 2 Black Part 3023 Element 302326 ×1
  • Plate Special 1 x 1 with Clip Horizontal [Thick U Clip] Black Part 6019 Element 601976 or 601926 ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Black Part 3794a ×1
  • Plate Special 2 x 2 with 2 Pin Holes Black Part 2817 Element 281726 ×4
  • Steering Stand 1 x 2 with Black Steering Wheel Black Part 3829c01 Element 73081 ×1
  • Tile 2 x 2 with Space Police II Print logo Black Part 3068bpr0075 ×1
  • Wedge Plate 3 x 6 Cut Corners Black Part 2419 Element 241926 ×2
  • Wheel Hard Plastic Small (22mm D. x 24mm) Black Part 6118 Element 4106928 or 611876 ×8

Light Gray 16 pieces

  • Bracket 2 x 2 - 2 x 2 Light Gray Part 3956 Element 395602 ×1
  • Brick Round 2 x 2 x 2 with Axle Hole and Fins Light Gray Part 4591 ×1
  • Cone 2 x 2 x 2, Open Stud Light Gray Part 3942c Element 394252 or 394202 ×1
  • Plate 1 x 2 Light Gray Part 3023 Element 302302 ×1
  • Plate Special 2 x 2 with Towball Light Gray Part 3729 Element 372902 ×1
  • Plate Special 2 x 2 with Towball Socket, Short, 4 Slots Light Gray Part 3730 Element 373002 ×1
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 ×8
  • Tile Special 1 x 2 Grille with Bottom Groove Light Gray Part 2412b Element 241202 ×1
  • Wedge Plate 3 x 4 without Stud Notches Light Gray Part 4859 ×1

Red 3 pieces

  • Antenna 8H Whip Red Part 2569 Element 256921 ×1
  • Plate Special 1 x 2 Side Handle [Free Ends] Red Part 2540 Element 4140585 or 254021 ×2

Trans-Green 3 pieces

  • Dish 2 x 2 Inverted [Radar] Trans-Green Part 4740 Element 6076601 or 4179430 ×2
  • Windscreen 5 x 2 x 1 2/3 Trans-Green Part 6070 Element 607048 ×1

White 1 piece

  • Equipment Weapon, Loudhailer / Speaker / Blaster / Space Gun White Part 4349 Element 434901 ×1

Minifigures 1 figure

  • Space Police II 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.

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