What is a window sticker?

A window sticker — officially the "Monroney label" — is the printed sheet the factory attaches to the window of every new vehicle. It has been federally required on new cars in the United States since the Monroney Act of 1958, and decades later it remains the single most authoritative summary of how a particular vehicle left the assembly line.

It lays out the standard equipment, the optional equipment and packages the original buyer selected, the EPA fuel-economy ratings, the warranty terms, the percentage of U.S./Canadian parts content, and the full price breakdown — base MSRP, each individual option, the destination charge, and the grand total. That original data is exactly what lets you confirm, years later, how a used vehicle was really configured.

Window sticker vs. build sheet

The two documents describe the same factory configuration in different ways. A window sticker is written for the buyer: plain equipment descriptions, fuel-economy ratings, warranty details, and a price breakdown right down to the destination charge.

A build sheet is the factory's own assembly record — the complete list of option codes a vehicle was built with, without pricing. WindowStickerVin.com returns the window sticker whenever one is on file, and automatically falls back to the build sheet when it isn't, so you always come away with the underlying factory data either way. For a deeper comparison, see our guide on window sticker vs. build sheet.

Why check your window sticker or build sheet?

Whether you're buying a used car, selling one, arranging insurance, or just settling a curiosity, the factory record is the most reliable way to confirm exactly how a vehicle was equipped the day it was built — far more dependable than a listing description or a faded memory.

It lets you verify the trim level, the engine and drivetrain, the option packages, and individual features, and it makes it easy to tell factory-installed equipment apart from anything a dealer or previous owner added afterward. For buyers especially, it's a quick way to make sure a seller's claims actually match how the vehicle left the line.

How reliable is 27X when checking factory equipment?

Packages & Towing · 2012 Chrysler 300 · 385 views · 7 replies

27X — Customer Preferred Package 27X. This code identifies a factory option package or special-edition equipment group. Browse Sales Code codes →

Derek L. Jun 5, 2026 · California

My 2012 Chrysler 300 shows 27X: “Customer Preferred Package 27X. This code identifies a factory option package or special-edition equipment group” The vehicle has had previous owners, so I am trying to separate factory equipment from later modifications. Is this code enough to confirm how it left the factory?

4 likes

7 replies

Nicole M. Jun 5, 2026

I would start by checking the original build sheet and then compare the physical equipment on the vehicle. A sales or option code confirms the factory record, but it does not prove that every original component is still installed.

3 likes

Mike N. Jun 6, 2026

I would avoid buying retrofit parts until the connectors and module support are confirmed. Returning electronic or VIN-programmed components can be difficult.

2 likes

Jeff C. Jun 11, 2026

Some codes are reused across several brands, but that does not always mean the parts are identical. Model, trim, drivetrain, and production date can all matter.

3 likes

Brooke P. Jun 11, 2026

A window sticker is helpful for customer-facing option names, while the build sheet is usually more detailed. If they disagree, the vehicle-specific dealer equipment list can help connect the sales name to 27X.

3 likes

Nick E. Jun 12, 2026

My experience has been positive, but the benefit depends on how the vehicle is used. I would treat 27X as confirmation of the configuration, then evaluate whether that equipment matters for your driving.

3 likes

Amanda E. Jun 16, 2026

The safest interpretation is the one tied to the exact VIN, model year, platform, and market. In general, 27X matches “Customer Preferred Package 27X. This code identifies a factory option package or special-edition equipment group” but the included hardware can vary between applications.

3 likes

Alex W. Jun 18, 2026

Some codes are reused across several brands, but that does not always mean the parts are identical. Model, trim, drivetrain, and production date can all matter.

0 likes

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