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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.

Octan Twin Tank Rail Tanker

Checking

4537 Octan Twin Tank Rail Tanker

170 pieces in 71 part and color combinations, plus 1 minifigure.

The piece count includes the 4 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

Plates 40 pieces

  • Plate 1 x 4 Black Part 3710 Element 371026 ×2
  • Plate 2 x 10 Black Part 3832 Element 383226 ×1
  • Plate 2 x 2 Black Part 3022 Element 302226 ×2
  • Plate 2 x 3 Black Part 3021 Element 302126 ×4
  • Plate 2 x 4 Black Part 3020 Element 302026 ×1
  • Plate 2 x 6 Black Part 3795 Element 379526 ×2
  • Plate 2 x 8 Black Part 3034 Element 303426 ×1
  • Plate 1 x 4 Green Part 3710 Element 371028 ×1
  • Plate 2 x 10 Green Part 3832 Element 383228 ×1
  • Plate 1 x 2 Red Part 3023 Element 302321 ×4
  • Plate 1 x 4 Red Part 3710 Element 371021 ×1
  • Plate 2 x 2 Red Part 3022 Element 4613974 or 302221 ×2
  • Plate 2 x 2 Corner Red Part 2420 Element 242071 or 242021 ×6
  • Plate 2 x 3 Red Part 3021 Element 302121 ×2
  • Plate 2 x 4 Red Part 3020 Element 302021 ×2
  • Plate 4 x 8 Red Part 3035 Element 303521 ×1
  • Plate 1 x 1 Trans-Clear Part 3024 Element 6513962 or 6252041 ×2
  • Plate 1 x 2 White Part 3023 Element 6552100 or 6548261 ×4
  • Plate 2 x 10 White Part 3832 Element 6552109 or 383201 ×1

Bricks Wedged 24 pieces

  • Brick Wedged 3 x 3 Facet White Part 2462 Element 6619281 or 6056272 ×8
  • Brick Wedged, Sloped 3 x 3 x 2 Facet Top White Part 2463 ×8
  • Brick Wedged, Sloped Inverted 3 x 3 x 2 Facet White Part 2464 Element 246401 ×8

Plates Round Curved and Dishes 22 pieces

  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Green Part 4032a Element 403228 ×8
  • Plate Round 1 x 1 with Solid Stud Red Part 6141 Element 614121 1 spare in the box ×2
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Red Part 4032a Element 403221 ×6
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) White Part 4032a Element 6601914 or 403201 ×6

Plates Special 9 pieces

  • Bracket 1 x 2 - 1 x 4 [Square Corners] Black Part 2436 Element 4282746 or 243626 ×2
  • Plate Special 2 x 2 with Wheel Holders Black Part 4600 Element 460026 ×2
  • Bracket 1 x 2 - 1 x 4 [Square Corners] Green Part 2436 Element 4282747 or 4280152 ×1
  • Bracket 1 x 2 - 1 x 4 [Square Corners] Red Part 2436 Element 4282742 or 243621 ×1
  • Plate Special 1 x 1 with Clip Light, Bar Hole [Thick Ring] Red Part 4081b Element 6281994 or 4632572 ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) White Part 3794a ×1

Bricks Round and Cones 8 pieces

  • Brick Round 1 x 1 Open Stud Red Part 3062b Element 306221 ×2
  • Brick Round 2 x 2 with 'Octan' Print White Part 3941pr0004 Element 4112809 ×6

Plates Wedged 8 pieces

  • Wedge Plate 3 x 6 Cut Corners Green Part 2419 Element 241928 ×4
  • Wedge Plate 3 x 6 Cut Corners Red Part 2419 Element 241921 ×4

Tiles 8 pieces

  • Tile 1 x 2 with Groove Red Part 3069b Element 4178178 or 306921 ×2
  • Tile 1 x 1 with Groove Trans-Red Part 3070b Element 6581817 or 6254248 1 spare in the box ×2
  • Tile 1 x 2 with Groove White Part 3069b Element 6548264 or 306901 ×2
  • Tile 1 x 8 with Groove White Part 4162 Element 6552110 or 416201 ×2

Wheels and Tyres 8 pieces

  • Tyre 21 x 12 with Offset Tread Small Wide Black Part 6015 Element 601526 ×4
  • Wheel 11 x 12 with Hole Round for Wheels Holder Pin White Part 6014a Element 601401 ×4

Transportation - Land 7 pieces

  • Train Buffer Beam Black Part 4022 Element 4109853 or 402276 ×2
  • Wheel Holder, Train with Wheels [Complete Assembly] Black Part 2878c01 Element 4207401 or 74784 ×2
  • Steering Stand 1 x 2 with Black Steering Wheel Red Part 3829c01 Element 9552 ×1
  • Vehicle Base 4 x 5 with Wheel Arches, 2 x 2 Opening Red Part 4211 Element 4261132 or 421121 ×1
  • Wheel Arch, Mudguard 2 x 4 [Smooth] Red Part 3787 Element 4190510 or 378721 ×1

Tiles Special 6 pieces

  • Tile Special 1 x 1 with Clip and Straight Tips Black Part 2555 Element 255526 ×2
  • Tile Special 1 x 2 Grille with Bottom Groove Black Part 2412b Element 241226 ×2
  • Tile Special 1 x 2 Grille with Bottom Groove Green Part 2412b Element 4568993 or 4519978 ×2

Bricks 5 pieces

  • Brick 2 x 4 Black Part 3001 Element 300126 ×2
  • Brick 1 x 1 White Part 3005 Element 6552096 or 6548258 ×2
  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×1

Magnets and Holders 4 pieces

  • Magnet Cylindrical Black Part 73092 Element 73092 ×2
  • Train Coupling New Black Part 2920 Element 4299239 or 292076 ×2

Panels 4 pieces

  • Panel 1 x 2 x 1 [Square Corners] Black Part 4865a Element 486526 ×2
  • Panel 1 x 2 x 1 [Square Corners] White Part 4865a Element 486501 ×2

Bars, Ladders and Fences 3 pieces

  • Fence Lattice 1 x 4 x 2 Red Part 3185 Element 318521 ×2
  • Lever Small Base with Black Lever White Part 298c02 Element 73737 1 spare in the box ×1

String, Bands and Reels 3 pieces

  • String Reel 2 x 2 Winch Drum Black Part 2585 Element 4188195 or 4160809 ×1
  • String Reel 2 x 2 Winch Holder Black Part 2584 Element 6465125 or 6163507 ×1
  • Minifig Simple Hose Nozzle with 35L Black String Light Gray Part 16542 Element 6062211 ×1

Bricks Sloped 2 pieces

  • Brick Sloped 45° 2 x 2 with 3 Gauges and 3 Knobs Print Black Part 3039pr9970 Element 4251812 or 4163777 ×2

Hinges, Arms and Turntables 2 pieces

  • Hinge Vehicle Roof 4 x 4 White Part 4213 Element 4256454 or 421301 ×1
  • Hinge Vehicle Roof Holder 1 x 4 x 2 White Part 4214 Element 421401 ×1

Minifig Accessories 2 pieces

  • Tap 1 x 1 with Hole in Spout Black Part 4599a ×2

Windows and Doors 2 pieces

  • Door 1 x 3 x 1 Left White Part 3822 Element 4527637 or 4161547 ×1
  • Door 1 x 3 x 1 Right White Part 3821 Element 4537987 or 4527638 ×1

Bricks Special 1 piece

  • Brick Special 1 x 2 with Grille Black Part 2877 Element 287726 ×1

Stickers 1 piece

  • Sticker Sheet for Set 4537-1 [No Color/Any Color] Part 821430 ×1

Windscreens and Fuselage 1 piece

  • Windscreen 2 x 4 x 2 Trans-Light Blue Part 3823 Element 6581802 or 6253682 ×1

Minifigures 1 figure

  • Man, White Top with Large Octan Logo, Green Legs, Red Cap 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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