Free 1991 Buick Roadmaster VIN Decoder

How to decode a 1991 Buick Roadmaster VIN

Characters 1-3 of a 1991 Buick Roadmaster VIN

A World Manufacturer Identifier (WMI) is the initial sequence of characters in the Vehicle Identification Number (VIN), consisting of three characters that uniquely identify the manufacturer of the vehicle. For the 1991 Buick Roadmaster, the WMI “1G4” signifies that the vehicle was produced by General Motors LLC, based in Warren, Michigan, United States. This part of the VIN is crucial for identifying the car’s manufacturing origin, the entity responsible for its production, and its vehicle type, which in this case, is specified as a passenger car. The WMI is a global standard used by the auto industry to classify vehicles, ensuring a unique identification for every vehicle produced around the world.

List of WMI Codes for a 1991 Buick Roadmaster

WMI: 1G4

• Model Years Covered: 1991-1996
• Example VIN: 1G4BR83E1MW404671
• Manufacturer Name: General Motors LLC
• Vehicle Type: Passenger Car
• City: Warren
• State or Province: Michigan
• Country: United States

Characters 4-8 are the Vehicle Descriptor Section (VDS) of a 1991 Buick Roadmaster VIN

These characters correspond to components like:

• Engine type
• Transmission
• Model or trim
• Body style
• Gross vehicle weight range

Below find the known vehicle descriptor codes for a 1991 Buick Roadmaster:

Auto manufacturers have some discretion to decide how they want to code this section, but its contents and decoded results are generally consistent.

Character 9 is the “check digit” in a 1991 Buick Roadmaster VIN.

Based on a formula developed by the US Department of Transportation, it helps reduce fraud by ensuring the validity of the VIN.

10th Character in the 1991 Buick Roadmaster VIN — Year Code

11th Character in the 1991 Buick Roadmaster VIN — Plant Code(s)

Known 1991 Buick Roadmaster Assembly Factory VIN Code(s)

VIN Characters 12 - 17 of a 1991 Buick Roadmaster

The final 6 characters in a 1991 Buick Roadmaster’s 17-digit VIN are its serial number, which will be unique to every vehicle.

Check your Buick Roadmaster’s VIN below:

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What info can a 1991 Buick Roadmaster VIN reveal?

• Model Year: The VIN can reveal the vehicle’s model year, such as 1991, providing insights into the potential age and design era of the vehicle.
• Engine Specifications: Details about the engine, including its configuration possibly as V-Shaped, displacement in terms of CC (around 5000), CI (approximately 305.11872047366), and liters (approximately 5.0), as well as the number of cylinders (approximately 8) and the manufacturer (CPC), offer extensive knowledge about the vehicle’s powerplant.
• Fuel Type and Efficiency: The primary fuel type, in this case, Gasoline, alongside specifics like the throttle body fuel injection system, may shed light on the vehicle’s fuel usage and potential efficiency.
• Safety Features: Information regarding safety features, such as the possible presence of driver seat only front airbags and the type of seat belt (Manual), could be gleaned, highlighting the vehicle’s safety provisions.
• Body Class and Size: The body class is identified as a Wagon with 4 doors, and the trim as Estate Wagon, which can help users understand the vehicle’s size, utility, and style.
• Manufacturing Details: The assembly location, including the plant city (Ypsilanti Twp), state (Michigan), country (United States), and the plant company name (Willow Run Assembly), offers a glimpse into the vehicle’s production background.
• Vehicle Identification Details: Using a sample VIN (1G4BR83E1MW404671), one can decode vehicle-specific information such as the model (Roadmaster), which helps in verifying the authenticity and details of the vehicle.

Sample VIN Decode Report for a 1991 Buick Roadmaster

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