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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.

Mars Exploration Rover

Checking

7471 Mars Exploration Rover

865 pieces in 111 part and color combinations.

LEGO counts 870 pieces. This inventory comes from a separate parts catalog and lists 865; the two do not always count the same elements, so their totals differ. 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

Technic Connectors 204 pieces

  • Technic Axle Connector Ridged [with x Hole x Orientation] Black Part 6538b Element 4113805 or 4107083 ×4
  • Technic Axle Connector with Axle Hole Black Part 32039 Element 4107081 or 3203926 ×1
  • Technic Axle and Pin Connector Angled #1 Black Part 32013 Element 6284699 or 4107085 ×2
  • Technic Axle and Pin Connector Angled #2 - 180° Black Part 32034 Element 6271869 or 4107783 ×1
  • Technic Axle and Pin Connector Perpendicular Black Part 6536 Element 6261371 or 4173668 ×4
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Black Part 32184 Element 6276951 or 4121667 ×4
  • Technic Axle Connector Ridged [with x Hole x Orientation] Dark Gray Part 6538b Element 4141426 ×2
  • Technic Axle Connector with Axle Hole Dark Gray Part 32039 Element 4141420 ×1
  • Technic Axle and Pin Connector Angled #1 Dark Gray Part 32013 Element 4140503 ×10
  • Technic Axle and Pin Connector Angled #2 - 180° Dark Gray Part 32034 Element 4207756 ×12
  • Technic Axle and Pin Connector Angled #4 - 135° Dark Gray Part 32192 Element 4142293 ×2
  • Technic Axle and Pin Connector Angled #6 - 90° Dark Gray Part 32014 Element 4141424 ×2
  • Technic Axle and Pin Connector Perpendicular Dark Gray Part 6536 Element 4173659 or 4141206 ×8
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Dark Gray Part 42003 Element 4175439 ×6
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Dark Gray Part 32184 Element 4163707 or 4124028 ×4
  • Technic Axle Connector Ridged [with x Hole x Orientation] Light Gray Part 6538b Element 4113804 or 4100408 ×10
  • Technic Axle Connector with Axle Hole Light Gray Part 32039 Element 4106469 ×15
  • Technic Axle and Pin Connector Angled #1 Light Gray Part 32013 Element 4106376 ×22
  • Technic Axle and Pin Connector Angled #2 - 180° Light Gray Part 32034 Element 4107830 ×24
  • Technic Axle and Pin Connector Angled #6 - 90° Light Gray Part 32014 Element 4143353 or 4106377 ×5
  • Technic Axle and Pin Connector Perpendicular Light Gray Part 6536 Element 4173667 or 653602 ×32
  • Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Light Gray Part 42003 Element 4175440 ×12
  • Technic Axle and Pin Connector Perpendicular 3L with Centre Pin Hole Light Gray Part 32184 Element 4124443 ×16
  • Technic Axle and Pin Connector Perpendicular Double Split Light Gray Part 41678 Element 4208067 or 4163534 ×4
  • Technic Pin Connector Round [No Slot] Light Gray Part 75535 Element 4141506 ×1

Technic Axles 179 pieces

  • Technic Axle 10 Black Part 3737 Element 373726 ×1
  • Technic Axle 12 Black Part 3708 Element 370826 ×1
  • Technic Axle 2 Notched Black Part 32062 Element 4109810 or 3206226 ×49
  • Technic Axle 4 Black Part 3705 Element 370526 ×13
  • Technic Axle 5.5 with Stop [Flat Short End] Black Part 32209 Element 4124045 ×12
  • Technic Axle 6 Black Part 3706 Element 370626 ×19
  • Technic Axle 8 Black Part 3707 Element 370726 ×5
  • Technic Axle 3 with Stud Dark Gray Part 6587 Element 4113884 or 658727 ×5
  • Technic Axle 3 Light Gray Part 4519 Element 4186007 ×48
  • Technic Axle 5 Light Gray Part 32073 Element 4141482 ×14
  • Technic Axle 7 Light Gray Part 44294 Element 4183835 ×12

Technic Pins 159 pieces

  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Black Part 6558 Element 655826 ×24
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×30
  • Technic Pin with Friction Ridges Lengthwise and Towball - Square Pin Hole Black Part 6628b ×1
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×45
  • Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 ×7
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Dark Gray Part 32054 Element 4141437 ×2
  • Technic Axle Towball Light Gray Part 2736 Element 273602 ×4
  • Technic Pin Double with Axle Hole Light Gray Part 32138 Element 4207743 ×2
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Light Gray Part 32054 Element 4195303 ×2
  • Technic Pin Long without Friction Ridges - Single Slot Light Gray Part 32556a Element 4154753 ×5
  • Technic Pin without Friction Ridges Lengthwise Light Gray Part 3673 Element 4184166 or 367302 1 spare in the box ×2
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×35

Technic Beams 114 pieces

  • Technic Beam 1 x 15 Thick Dark Gray Part 32278 Element 4142292 ×1
  • Technic Beam 1 x 2 Thin Dark Gray Part 41677 Element 4207748 ×8
  • Technic Beam 1 x 3 Thick Dark Gray Part 32523 Element 4154759 ×2
  • Technic Beam 1 x 7 Thick Dark Gray Part 32524 Element 4154760 ×7
  • Technic Beam 1 x 9 Thick Dark Gray Part 40490 Element 4156340 ×2
  • Technic Beam 3 x 5 L-Shape Thick Dark Gray Part 32526 Element 4155459 ×6
  • Technic Beam Triangle Thin [Type I] Dark Gray Part 2905 Element 4142544 or 4124042 ×8
  • Technic Beam 1 x 15 Thick Light Gray Part 32278 Element 4172457 ×2
  • Technic Beam 1 x 2 Thick Light Gray Part 43857 Element 4195272 ×4
  • Technic Beam 1 x 2 Thin Light Gray Part 41677 Element 4162783 ×17
  • Technic Beam 1 x 3 Thin Light Gray Part 6632 Element 4107825 ×20
  • Technic Beam 1 x 4 Thin Light Gray Part 32449 Element 4141603 ×20
  • Technic Beam 1 x 9 Thick Light Gray Part 40490 Element 4195406 ×7
  • Technic Beam 2 x 4 L-Shape Thick Light Gray Part 32140 Element 4121620 ×6
  • Technic Beam 3 x 3 L-Shape Thin Light Gray Part 32056 Element 4111941 ×2
  • Technic Beam 3 x 5 L-Shape Thick Light Gray Part 32526 Element 4154958 ×2

Technic Bushes 81 pieces

  • Technic Bush Light Gray Part 3713 Element 4125313 or 659002 1 spare in the box ×34
  • Technic Bush 1/2 Smooth with Axle Hole Reduced Light Gray Part 32123a 1 spare in the box ×16
  • Technic Bush 1/2 Smooth with Axle Hole Reduced Tan Part 32123a Element 4206210 2 spares in the box ×31

Technic Gears 22 pieces

  • Technic Gear 12 Tooth Bevel Light Gray Part 6589 Element 658902 ×3
  • Technic Gear 12 Tooth Double Bevel Light Gray Part 32270 Element 4141454 or 4125322 ×6
  • Technic Gear 20 Tooth Double Bevel with Axle Hole Type 2 [X Opening] Light Gray Part 32269 Element 4141455 ×2
  • Technic Gear 8 Tooth Light Gray Part 3647 Element 364702 1 spare in the box ×3
  • Technic Worm Gear Light Gray Part 4716 Element 471602 ×1
  • Technic Gear 20 Tooth Double Bevel with Axle Hole Type 2 [X Opening] White Part 32269 Element 4205111 ×1
  • Technic Knob Wheel White Part 32072 Element 4114203 ×6

Plates Round Curved and Dishes 16 pieces

  • Dish 4 x 4 Inverted [Radar] Black Part 3960 Element 396026 ×1
  • Plate Round 1 x 1 with Solid Stud Black Part 6141 Element 614126 1 spare in the box ×2
  • Dish 6 x 6 Inverted (Radar) with Hollow Studs Light Gray Part 44375a Element 4182294 ×1
  • Plate Round 1 x 1 with Solid Stud Light Gray Part 6141 Element 614102 1 spare in the box ×6
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Light Gray Part 4032a Element 403202 ×2
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Tan Part 4032a Element 4140562 or 403205 ×3
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Tan Part 2654 Element 4278422 or 4140561 ×1

Technic Steering, Suspension and Engine 16 pieces

  • Technic Link 1 x 9 Black Part 32293 Element 6244698 or 4141300 ×2
  • Technic Steering Knuckle Arm with Ball Joint Light Gray Part 6572 Element 4154763 or 657202 ×4
  • Technic Universal Joint 4L [Complete Assembly] Light Gray Part 9244 Element 9244 ×8
  • Technic Shock Absorber 10L, Damped, Soft Spring Trans-Clear Part 76320c02 ×2

Bricks Round and Cones 12 pieces

  • Cone 1 x 1 [No Top Groove] Light Gray Part 4589 Element 458902 ×1
  • Brick Round 2 x 2 with Axle Hole White Part 3941 Element 6601920 or 614351 ×11

Wheels and Tyres 12 pieces

  • Tyre 56 x 30 R Balloon Black Part 32180 Element 4119020 ×6
  • Wheel 49.6 x 28 VR (36.8 x 26) with Axle Hole Light Gray Part 6595 Element 4179484 or 4163403 ×6

Technic Special 11 pieces

  • Technic Cam Black Part 6575 Element 4143187 ×2
  • Technic Flex Cable End - Ball Connection with Cage Black Part 6644 Element 664426 ×4
  • Technic Plate 1 x 5 with Smooth Ends, 4 Studs and Centre Axle Hole Black Part 32124 Element 6280168 or 4114689 ×1
  • Technic Cam Dark Gray Part 6575 Element 4157379 ×2
  • Technic Flex Cable 12L Very Light Gray Part flex08c12 Element 4212321 ×2

String, Bands and Reels 9 pieces

  • Rubber Band Small 13mm (Square Cross Section) Black Part 71509 Element 4141606 or 4107153 ×4
  • Rubber Belt Small [15mm ID] [Round Cross Section] White Part 85543 Element 6699001 or 4580665 ×4
  • Rubber Band 15mm [Square Cross Section] Yellow Part 23229 Element 4125669 or 4124335 3 spares in the box ×1

Bricks 8 pieces

  • Brick 1 x 2 x 2 with Inside Axle Holder Tan Part 3245b ×8

Tubes and Hoses 8 pieces

  • Hose Rigid 3mm D. 10L / 8.0cm Dark Gray Part 75c10 Element 4173690 ×2
  • Hose, Ribbed 7mm D. 2L / 1.6cm Pearl Light Gray Part 78c02 Element 4495192 or 4275384 ×2
  • Hose, Ribbed 7mm D. 3L / 2.4cm Pearl Light Gray Part 78c03 Element 4495199 or 4275333 ×1
  • Hose, Ribbed 7mm D. 5L / 4.0cm Pearl Light Gray Part 78c05 Element 4495201 or 4275382 ×2
  • Hose Rigid 3mm D. 4L / 3.2cm White Part 75c04 Element 4119018 1 spare in the box ×1

Non-System Parts 7 pieces

  • Mars Rover Solar Panel, Front Panel Trans-Dark Blue Part 47521a ×2
  • Mars Rover Solar Panel, Middle Panel Trans-Dark Blue Part 47521c ×2
  • Mars Rover Solar Panel, Rear Panel Trans-Dark Blue Part 47521d ×1
  • Mars Rover Solar Panel, Side Panel Trans-Dark Blue Part 47521b ×2

Technic Bricks 4 pieces

  • Technic Brick 1 x 16 [15 Pin Holes] Tan Part 3703 Element 4206923 or 4133508 ×4

Bricks Sloped 1 piece

  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Light Gray Part 3660 Element 366002 ×1

Gear Parts 1 piece

  • Fact Book, Mars Exploration Rover [No Color/Any Color] Part 7471bk01 ×1

Plates Special 1 piece

  • Bracket 2 x 2 - 2 x 2 Light Gray Part 3956 Element 395602 ×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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