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              | Years (US) and Model Name | 1992-1997 100 / A61992-1995 S4/S6
 | 
              1998-2004  A6 / Allroad / S6 / RS6 | 2005-2010 A6 / S6 / 
              RS6 |  
              | Platform Code | C4 | C5 | C6 / AU56X |  
              | Chassis Code (Check the 7th and 8th digits of the VIN Number) | 4A | 4B | 4F / FB |  
              | Model Years (non-US) | 1992-1996 | 1997-2004 | 2005+ |  
              | Interfaces |  |  |  |  
              | Which Interface to Buy? | HEX-USB+CAN 
              (USB) HEX-COM+CAN 
              (Serial)
 KII-USB (USB)
 Micro-CAN (Will not work!)
 | HEX-USB+CAN 
              (USB) HEX-COM+CAN 
              (Serial)
 KII-USB 
              (USB)
 Micro-CAN (Will not work!)
 | HEX-USB+CAN 
              (USB) HEX-COM+CAN 
              (Serial)
 
 KII-USB(Will 
              not work!)Micro-CAN (Will not work!)
 |  
              | Module ID & Name |  |  |  |  
              | 01Engine
 | Y (if capable of Rapid Data Transfer, a few non-US engines were not) | Y | 
              Y, (CAN) |  
              | 02Auto Trans
 | 
              Y (If equipped) | 
              Y (If equipped) | 
              Y, 
              (CAN, If equipped) |  
              | 03ABS Brakes
 | 
              Y (If equipped, as of 1994) | 
              Y | Y, (CAN) |  
              | 05Acc/Start Authorization
 | N | N | 
              Y, (CAN) |  
              | 06Seat Memory - Pass Side
 | N | N | 
              Y, 
              (CAN, If equipped) |  
              | 07Control Head
 | N | N | 
              Y, (CAN) |  
              | 08HVAC
 | Y | Y (2nd K-wire, from MY 2002+) | Y, (CAN) |  
              | 09Electrical Control
 | N | N | 
              Y, (CAN) |  
              | 0EMedia Player 1
 | N | N | 
              Y, 
              (CAN, If equipped) |  
              | 0F Digital Radio
 | N | N | Y, 
              (CAN, If equipped) |  
              | 11 Engine II
 | N | N | Y, 
              (CAN, If equipped) |  
              | 13 Auto Dist. Regulation
 | N | N | Y, 
              (CAN, If equipped) |  
              | 15Airbags
 | 
              Y (If equipped) | 
              Y | Y, (CAN) |  
              | 16Steering Wheel
 | 
              N | 
              Y (If equipped, 2nd K-wire, from MY 2002+) | Y, (CAN) |  
              | 17Instruments
 | Y (from 1994+) | Y | Y, (CAN) |  
              | 18 Aux. Heater
 | N | Y (If equipped, 2nd K-wire) | Y, 
              (CAN, If equipped) |  
              | 19CAN Gateway
 | 
              N | N | 
              Y, (CAN) |  
              | 1E Media Player 2
 | N | N | Y, 
              (CAN, If equipped) |  
              | 22All Wheel Drive
 | 
              N (purely mechanical) | 
              N (purely mechanical) | N (purely mechanical) |  
              | 25Immobilizer
 | 
              Y (If equipped, non-US starting mid-1990s) | 
              Y (If equipped, as of 2001 in US, integrated with cluster in 
              address 17) | Y (CAN, same as address 05)
 |  
              | 28HVAC, Rear
 | 
              N | N | 
              Y, (CAN) |  
              | 34Level Control
 | 
              N | Y (Allroad only, 2nd K-wire, from MY 2002+) | Y, 
              (CAN, If equipped) |  
              | 35Central Locks
 | 
              N | Y (2nd K-wire, from MY 2002+) | N |  
              | 36Driver's Seat
 | 
              N | 
              Y (If equipped, 2nd K-wire, from MY 2002+) | 
              Y, 
              (CAN, If equipped) |  
              | 37Navigation
 | 
              N | Y (If equipped, 2nd K-wire) | 
              Y, 
              (CAN, If equipped) |  
              | 3DSpecial Function
 | 
              N | N | 
              Y, 
              (CAN, If equipped) |  
              | 42Door Elect, Driver
 | 
              N | N | 
              Y, (CAN) |  
              | 45Interior Monitor
 | N | Y | N |  
              | 46Central Convenience
 | 
              N | N | 
              Y, (CAN) |  
              | 47Sound System
 | 
              N | N | 
              Y, 
              (CAN, If equipped) |  
              | 4FCentr. Electr. II
 | 
              N | N | 
              Y, (CAN) |  
              | 52Door Elect, Pass
 | 
              N | N | 
              Y, (CAN) |  
              | 53Parking Brake
 | 
              N | N | 
              Y, (CAN) |  
              | 55Headlight Range
 | 
              N | 
              Y (If equipped, 2nd K-wire, from MY 2002+) | 
              Y, 
              (CAN, If equipped) |  
              | 56Radio
 | 
              N | Y (2nd K-wire, from MY 2002+) | Y, (CAN) |  
              | 57TV Tuner
 | 
              N | Y (If equipped, 2nd K-wire) | 
              Y, 
              (CAN, If equipped) |  
              | 61Battery Regul.
 | 
              N | N | 
              Y, (CAN) |  
              | 62Door, Left Rear
 | 
              N | N | 
              Y, (CAN) |  
              | 65Tire Pressure Monitor
 | 
              N | Y (If equipped, 2nd K-wire) | 
              Y, 
              (CAN, If equipped) |  
              | 67Voice Control
 | 
              N | Y (If equipped, 2nd K-wire) | 
              Y, 
              (CAN, If equipped) |  
              | 69Trailer Controller
 | 
              N | N | 
              Y, 
              (CAN, If equipped) |  
              | 72Door, Right Rear
 | 
              N | N | 
              Y, (CAN) |  
              | 75Telematics
 | 
              N | 
              Y (If equipped, 2nd K-wire) | 
              Y, (CAN, If equipped) |  
              | 76Park Assist
 | 
              N | 
              Y (If equipped, 2nd K-wire) | 
              Y, (CAN, If equipped) |  
              | 77Telephone
 | 
              N | 
              Y (If equipped) | 
              Y, (CAN) |  
              |  |  |  |  |  
              | Diagnostic Port Location | In 
              fuse box under hood near firewall 
 -or-
 
 Between Front Seats
 | Under Dash 
              -or-
 Between Front Seats
 | Under Dash |  
              | Bentley CD Available? | Yes (US/Canadian models only) | Yes (US/Canadian models only) | Yes (US/Canadian models only) |  
              | Where can I find information on 
              this vehicle? | Try the
              AudiWorld forums. | See the
              
              C5/4B Wiki Page | See the
              
              C6/4F Wiki Page |  
              | Y = Control Module is capable of Rapid Data 
          Transfer (i.e. it "talks" to VAG-COM) N = Control Module (if it exists) is not capable of Rapid Data 
          Transfer
 KWP-2000 = Control Module communicates using the new
          KWP-2000 Protocol (Otherwise,
          KWP-1281)
 2nd K-wire = Control Module may exist on the 2nd K-wire (needs a
          Dual-K compatible interface)
 CAN = Uses Controller Area Network diagnostics, requires a
          CAN Interface
 
 
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