How to Read VW & Audi Chassis Codes (Mk7, 8V, 8Y, B9, C8 and more)

VW and Audi owners run into a wall of letters and numbers when shopping for parts: Mk7, 8V, 8Y, B9, C8. These are chassis codes, and learning to read them is the single fastest way to make sure you buy parts that actually fit. This guide decodes the system so you can identify your car with confidence.

Why chassis codes matter for buying parts

Model names alone are not specific enough. An Audi S3 has existed across multiple generations that share a name but differ in hardware. A chassis code pins down the exact generation, which determines fitment for intakes, intercoolers, suspension and more. When a parts listing says it fits an 8Y but not an 8V, the chassis code is doing the important work.

Volkswagen: the Mk system

Volkswagen enthusiasts usually use Mk (mark) numbers for the Golf family. The relevant modern generations are:

• Mk7 - the Golf, GTI and Golf R generation built on the MQB platform. Browse GTI Mk7 parts and Golf R Mk7 parts.
• Mk7.5 - the facelifted Mk7 with updated styling and electronics, covered by collections such as Golf R Mk7.5 parts.
• Mk8 - the current Golf generation on MQB Evo. See GTI Mk8 parts.

Note that VW also uses internal type numbers, but for everyday parts shopping the Mk number and model year are what most owners rely on.

Audi: letter-and-number codes

Audi uses a code that combines a letter and a number to identify a generation. The letter often tracks the platform family and the number tracks the iteration. Common examples include:

• 8V - the A3, S3 and RS3 generation that shares MQB roots with the Mk7 Golf. See Audi S3 8V and Audi RS3 8V.
• 8Y - the newer A3, S3 and RS3 generation. See Audi S3 8Y and Audi RS3 8Y.
• B9 - the A4, S4, A5 and S5 generation, part of Audi's long-running B series of compact executive cars.
• C8 - the A6, S6, A7 and S7 generation, part of the C series of larger executive cars.

A quick reference table

Use this as a starting point, then confirm with your model year:

• Mk7 / Mk7.5 - VW Golf, GTI, Golf R (roughly 2013 to 2020).
• Mk8 - VW Golf, GTI, Golf R (2020 onward).
• 8V - Audi A3, S3, RS3 (roughly 2013 to 2020).
• 8Y - Audi A3, S3, RS3 (2020 onward).
• B9 - Audi A4, S4, A5, S5 (2016 onward).
• C8 - Audi A6, S6, A7, S7 (2018 onward).

How to find your chassis code

If you are unsure, there are a few reliable ways to confirm your generation:

• Check the model year against the ranges above, since generations change at known points.
• Look up your VIN with a decoder, which reveals the platform and model details.
• Compare your facelift status, as a Mk7.5 and a pre-facelift Mk7 differ in detail.

Putting it to use

Once you know your code, shopping becomes simple. Match the chassis code, the model year and the engine generation together, then start from your exact model rather than a generic listing. You can browse everything in the Audi A3 8V and Audi A3 8Y collections, or explore the full VW and Audi ranges and filter to your car.

Summary

Chassis codes like Mk7, 8V, 8Y, B9 and C8 are the key to correct fitment. Learn the code for your car, confirm it with your model year and VIN, and you will buy the right parts the first time.