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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.

Checking

42157 John Deere 948L-II Skidder

1,492 pieces in 202 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. 6 parts in this set come in two colors that are easy to mix up; they are listed below.
The spare pieces. This set comes with 19 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.

Look-alike colors in this set

These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.

Technic Axle Connector Smooth [with x Hole + Orientation] Black ×10 Dark Bluish Gray ×3 Black is darker than Dark Bluish Gray.
Technic Axle and Pin Connector Perpendicular Double Split [Reinforced] Black ×2 Dark Bluish Gray ×5 Black is darker than Dark Bluish Gray.
Technic Beam 1 x 2 Thick with Pin Hole and Axle Hole Black ×10 Dark Bluish Gray ×10 Black is darker than Dark Bluish Gray.
Technic Beam 3 x 5 L-Shape Thick Black ×6 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
Technic Connector Beam 3 x 3 Black ×4 Dark Bluish Gray ×2 Black is darker than Dark Bluish Gray.
Technic Pin Connector Round 1L [Beam] Black ×4 Dark Bluish Gray ×9 Black is darker than Dark Bluish Gray.

Piece checklist

Blue 184 pieces

Hose, Pneumatic 4mm D. 20L / 16cm Blue Part 5102c20 Element 6449538 ×1
Hose, Pneumatic 4mm D. 3L / 2.4cm Blue Part 5102c03 Element 6449507 or 6118945 ×2
Hose, Pneumatic 4mm D. 6L / 4.8cm Blue Part 5102c06 Element 6503701 or 6449522 ×2
Pneumatic Pump Large (11L) with 1 x 3 Liftarm Blue Part 26288 Element 6353193 or 6152004 ×1
Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×63
Technic Pin Long with Friction Ridges Lengthwise, 1 Center Slot Blue Part 42924 Element 6299413 ×115

Red 75 pieces

Technic Axle 2 Notched Red Part 32062 Element 4142865 ×47
Technic Axle 6 Red Part 3706 Element 6130002 or 4191526 ×2
Technic Axle Pin 3L with Friction Ridges Lengthwise and 1L Axle Red Part 11214 Element 6209519 ×22
Technic Axle and Pin Connector Perpendicular 3L with 2 Pin Holes Red Part 42003 Element 6273712 or 4175442 ×2
Technic Pin Connector Hub with 2 Pins with Friction Ridges Lengthwise [Small Squared Pin Holes] Red Part 44874 Element 6323573 ×2

Tan 37 pieces

Technic Axle 4 with Centre Stop Tan Part 99008 Element 4666999 ×4
Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×3
Technic Gear 12 Tooth Bevel Tan Part 6589 Element 4565452 or 4514556 ×12
Technic Gear 20 Tooth Bevel Tan Part 32198 Element 6031962 or 4514557 ×2
Technic Pin 3/4 Tan Part 32002 Element 6663097 or 6013938 2 spares in the box ×12
Technic Pin Long without Friction Ridges, with Anti-Roll Notch Tan Part 39888 Element 6321305 ×4

Reddish Brown 13 pieces

Technic Axle 3 with Stop Reddish Brown Part 24316 Element 6135494 ×5
Technic Axle 5 with Stop Reddish Brown Part 15462 Element 6159763 ×8

White 8 pieces

Pneumatic T-Piece (T Bar) [New Style] White Part 4697b Element 6615553 or 6289866 1 spare in the box ×6
Technic Driving Ring Connector White Part 18948 Element 6276052 or 6100932 ×2

Trans-Clear 6 pieces

Tile 1 x 1 with Groove Trans-Clear Part 3070b Element 6581822 or 6254254 1 spare in the box ×6

Bright Green 4 pieces

Hose Rigid 3mm D. 10L / 8.0cm Bright Green Part 75c10 Element 6439698 ×2
Hose Rigid 3mm D. 6L / 4.8cm Bright Green Part 75c06 Element 6451143 or 6439553 1 spare in the box ×2

Dark Tan 2 pieces

Technic Axle 3 with Stud Dark Tan Part 6587 Element 6031821 or 6013821 ×2

Dark Azure 1 piece

Technic Gear 20 Tooth with Axle Hole [+ Opening] Dark Azure Part 69779 Element 6396480 ×1

Flat Silver 1 piece

Propeller 8 Blade 5 Diameter Flat Silver Part 41530 Element 6325297 or 6289758 ×1

Orange 1 piece

Technic Axle and Pin Connector Angled #2 - 180° Orange Part 32034 Element 6271874 or 6135092 ×1

[No Color/Any Color] 1 piece

Sticker Sheet for Set 42157-1 [No Color/Any Color] Part 10101059 Element 6415924 ×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

42157 John Deere 948L-II Skidder

Before you call it missing

Look-alike colors in this set

Your missing list

Piece checklist

Black 549 pieces