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It seems, that my interface supports only this protocol, but freediag can't find any interface. Is there any way to scan my car with freediag?
KWP 1281 seems to be the official designation of the "vw"/"VAG" protocol. This is presumably a protocol carried over an ISO9141 link, and there is some code for this in freediag but I'm sorry to report it's quite broken and incomplete. Someone knowledgable about the protocol could possibly send manual requests after establishing a connection.