ELSA, the factory repair guide, lists the W12 as two banks. Which is correct, 2 banks of 6 in VR config. Left is passenger, right is driver on a RHD.
I guess you're reading a fault with VCDS. It may list a sensor number beginning with G. Or post the fault code.
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Matt
2004 A8 3.7q, 1998 A4 2.8q, 1994 Coupe 2.8q SORN,
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