Obd2 Audi s6 2007

When you use obd2 what does it specifically scan to get the vin from. Does it use the engine computers or only one of them or does it use a module on the car?

It’s usually the immobilizer system that holds all of the vin data. The dash / ECU / and not sure on the S6 but the central control module in some cars has vin data.

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