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.

Checking

42077 Rally Car

1,005 pieces in 153 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.

Every bag and the box. Shake out each bag, check its corners and seams, and look inside the empty box.
Inside what you have built. Small pieces lodge inside tubes, under plates and between studs. Turn the model over and look.
The last few steps. Compare each recent step with its parts callout. A piece used in the wrong place earlier leaves you one short later.
Look-alike colors. Compare each color with the step's parts callout, especially White against Trans-Clear.
The spare pieces. This set comes with 12 spare pieces, marked on each row of the checklist. One may be the piece you need.
The floor and your building area. Check under furniture, the chair and the edges of your building surface.

Piece checklist

Technic Bushes 20 pieces

Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 1 spare in the box ×8
Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Yellow Part 32123b Element 6271167 or 3212324 1 spare in the box ×12

Technic Gears 11 pieces

Technic Gear 12 Tooth Double Bevel Black Part 32270 Element 4177431 ×2
Technic Gear 20 Tooth Double Bevel with Axle Hole Type 1 [+ Opening] Black Part 18575 Element 6346535 or 6093977 ×2
Technic Gear Rack 1 x 7 with Axle and Pin Holes Black Part 87761 Element 6327430 or 4562009 ×1
Technic Gear Differential with Inner Tabs and Closed Center, 28 Bevel Teeth [Beveled Edge] Dark Bluish Gray Part 62821b Element 4562210 or 4525184 ×1
Technic Gear 12 Tooth Bevel Tan Part 6589 Element 4565452 or 4514556 ×4
Technic Gear 20 Tooth Bevel Tan Part 32198 Element 6031962 or 4514557 ×1

Wheels and Tyres 10 pieces

Tyre 68.8 x 36 ZR Black Part 44771 Element 6062225 or 4614801 ×4
Wheel 31 x 15 Technic, 7 Pin Holes Red Part 60208 Element 6132385 ×2
Wheel 56 x 34 Technic Racing Medium with 6 Pin Holes Red Part 15038 Element 6276853 or 6149984 ×4

Bricks Round and Cones 8 pieces

Brick Round 1 x 1 diameter Tube with 90 Degree Elbow (2 x 2 x 1) and Axle Holes (Crossholes) at each end Red Part 25214 Element 6176298 ×4
Brick Round 2 x 2 Dome Top, Hollow Stud Red Part 30367c Element 4216657 ×1
Brick Round 2 x 2 with Axle Hole Red Part 3941 Element 614321 or 394121 ×3

Plates Round Curved and Dishes 8 pieces

Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Black Part 4032a Element 403226 ×4
Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Trans-Clear Part 2654 Element 6581772 or 6163901 ×4

Technic Beams Special 7 pieces

Technic Beam Frame 5 x 7 with 3 x 5 Opening Thick Black Part 64179 Element 6016154 ×4
Technic Beam 3 x 5 Thick [90° Offset Centre Beam Holes] Light Bluish Gray Part 14720 Element 6055519 ×1
Technic Beam 5 x 11 with 3 x 5 Opening Frame Thick Light Bluish Gray Part 64178 Element 4540797 ×2

Tubes and Hoses 7 pieces

Hose, Ribbed 7mm D. 11L / 8.8cm Flat Silver Part 78c11 Element 4617492 ×2
Axle Hose, Soft 19L White Part 32235 Element 6102484 or 4182888 ×3
Axle Hose, Soft 7L White Part 32580 Element 6212046 ×2

Plates Special 6 pieces

Plate Special 2 x 2 with 2 Pin Holes Black Part 2817 Element 281726 ×2
Plate Special 1 x 2 with Pin Hole Underneath Red Part 18677 Element 6168634 or 6109459 ×4

Technic Bricks 6 pieces

Technic Brick 1 x 2 [2 Pin Holes] Black Part 32000 Element 3200026 ×4
Technic Pin Connector Block 1 x 5 x 3 Light Bluish Gray Part 32333 Element 6271360 or 4205761 ×2

Bricks Curved 4 pieces

Brick Curved 3 x 1 No Studs Red Part 50950 Element 4251162 ×2
Brick Curved 2 x 2 with Lip, No Studs Trans-Clear Part 30602 Element 6507871 or 6166113 ×2

Bricks Sloped 4 pieces

Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Red Part 54200 Element 5074621 or 4504379 1 spare in the box ×2
Brick Sloped 18° 2 x 1 x 2/3 with 4 Slots / Grate White Part 61409 Element 6552142 or 6023804 ×2

Plates 4 pieces

Plate 1 x 2 Trans-Clear Part 3023 Element 6514001 or 6240204 ×4

Technic Special 4 pieces

Technic Link 1 x 16 Red Part 2637 Element 6212053 or 4106933 ×4

Tiles 4 pieces

Tile 1 x 2 with Groove Trans-Clear Part 3069b Element 6514223 or 6251294 ×2
Tile 1 x 2 with Groove Trans-Red Part 3069b Element 6514220 or 6251290 ×2

Tiles Round and Curved 4 pieces

Tile Round 1 x 1 Trans-Orange Part 98138 Element 6514197 or 6274747 1 spare in the box ×4

Transportation - Sea and Air 2 pieces

Jet Engine Fan with 10 Blades and Technic Pin Dark Bluish Gray Part 46667 Element 6313484 or 6100596 ×2

Minifig Accessories 1 piece

Tap 1 x 1 without Hole in Spout Light Bluish Gray Part 4599b Element 4211503 1 spare in the box ×1

Stickers 1 piece

Sticker Sheet for Set 42077-1 [No Color/Any Color] Part 37158 Element 6215547 ×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.

LEGO Missing Piece Checker

42077 Rally Car

Before you call it missing

Your missing list

Piece checklist

Technic Pins 414 pieces

Technic Beams 161 pieces

Technic Connectors 147 pieces

Technic Axles 74 pieces

Technic Panels 49 pieces