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quattroworld.com Forums: UrS C4, 200 20VT (3B) and S2/RS2 OBD1 Fault Code access port locations and info
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quattroworld.com Forums: OBD 2 port on a 98 C4 A6 (should be same as 96 and 97 A6 and 97 UrS6 (location but not OBD2)
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