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.

UFO Attack

Checking

3846 UFO Attack

88 pieces in 37 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.

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Piece checklist

Dark Bluish Gray 18 pieces

  • Brick Sloped 45° 2 x 1 Triple with Ovoid Bottom Pin Dark Bluish Gray Part 3048c Element 4552203 or 4541244 ×4
  • Brick Sloped 75° 2 x 1 x 3 with Hollow Stud Dark Bluish Gray Part 4460b Element 4221745 ×2
  • Brick Sloped Inverted 65° 6 x 6 x 2 Quad with Cutouts Dark Bluish Gray Part 30373 Element 4210640 ×1
  • Cone 2 x 2 x 2, Open Stud Dark Bluish Gray Part 3942c Element 6533790 or 6092666 ×1
  • Plate 4 x 4 Dark Bluish Gray Part 3031 Element 4243831 or 4211089 ×1
  • Plate Round 1 x 1 with Solid Stud Dark Bluish Gray Part 6141 Element 4210633 ×5
  • Plate Special 2 x 2 with Groove and Center Stud (Jumper) Dark Bluish Gray Part 87580 Element 6126083 or 4565322 ×4

Black 16 pieces

  • Arm Mechanical with Clip [Thin Support] Black Part 53989 Element 4623154 or 4294996 ×1
  • Bar 1L with Clip [Cut Edges and One Side Hole] [Gap in Clip] Black Part 48729b Element 6278152 or 6037347 ×1
  • Brick Round 1 x 1 Open Stud Black Part 3062b Element 306226 ×6
  • Die - 6 Sided Rubber Frame with Red Centre Studs (Board Games) Black Part 64776pat0001 Element 4539364 ×1
  • Dish 2 x 2 Inverted [Radar] Black Part 4740 Element 474026 ×2
  • Dish 3 x 3 Inverted [Radar] Black Part 43898 Element 4180087 ×1
  • Dish 6 x 6 Inverted (Radar) with Hollow Studs Black Part 44375a Element 4207127 ×1
  • Tile 1 x 2 with Groove Black Part 3069b Element 306926 ×2
  • Tool Screwdriver and Spanner / Wrench Black Part 4006 Element 6034000 or 4569095 ×1

Red 9 pieces

  • Dish 2 x 2 Inverted [Radar] Red Part 4740 Element 4585146 or 4279383 ×5
  • Dish 3 x 3 Inverted [Radar] Red Part 43898 Element 6365073 or 4179584 ×1
  • Microfig UFO Attack Alien Red Part 85863pr0029 Element 4586839 ×1
  • Tile Round 2 x 2 with Bottom Cross Red Part 4150 Element 415071 or 415021 ×2

Blue 8 pieces

  • Brick Round 1 x 1 Open Stud Blue Part 3062b Element 306223 ×6
  • Tile 1 x 2 with Groove Blue Part 3069b Element 306923 ×2

Light Bluish Gray 8 pieces

  • Bar 6L with Stop Ring Light Bluish Gray Part 63965 Element 6170418 or 6081975 ×1
  • Brick Sloped 75° 2 x 1 x 3 with Hollow Stud Light Bluish Gray Part 4460b Element 4211494 ×2
  • Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 ×1
  • Wedge Plate 8 x 8 Cut Corner Light Bluish Gray Part 30504 Element 4268343 ×4

Medium Blue 8 pieces

  • Brick Round 1 x 1 Open Stud Medium Blue Part 3062b Element 4585142 or 4129866 ×6
  • Tile 1 x 2 with Groove Medium Blue Part 3069b Element 4168345 ×2

Tan 8 pieces

  • Brick Round 1 x 1 Open Stud Tan Part 3062b Element 4117070 or 306205 ×6
  • Tile 1 x 2 with Groove Tan Part 3069b Element 4114026 ×2

White 8 pieces

  • Brick Round 1 x 1 with Fins, Open Stud White Part 4588 Element 6331225 or 6321197 ×4
  • Cone 1 x 1 [Top Groove] White Part 59900 Element 6601844 or 4518400 ×4

Green 1 piece

  • Plate 2 x 2 Green Part 3022 Element 302228 ×1

Orange 1 piece

  • Plate 2 x 2 Orange Part 3022 Element 4613982 or 4159007 ×1

Reddish Brown 1 piece

  • Plate 2 x 2 Reddish Brown Part 3022 Element 4613975 or 4216695 ×1

Trans-Neon Green 1 piece

  • Bar 4L (Lightsaber Blade / Wand) Trans-Neon Green Part 30374 Element 6507881 or 6170186 ×1

Yellow 1 piece

  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×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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