| A6 C5 1.8 T quattroSaloon | 1997 – 2005 | 1.8L AJL | 180 hp (132 kW) | Petrol | All-wheel Drive |
| A6 C5 2.4Saloon | 1998 – 2005 | 2.4L ASM | 136 hp (100 kW) | Petrol | Front-Wheel Drive |
| A6 C5 2.4Saloon | 1998 – 2005 | 2.4L ALW | 136 hp (100 kW) | Petrol | Front-Wheel Drive |
| A6 C5 2.4Saloon | 1998 – 2005 | 2.4L ARN | 136 hp (100 kW) | Petrol | Front-Wheel Drive |
| A6 C5 Avant 2.4Estate | 1998 – 2005 | 2.4L ALW | 136 hp (100 kW) | Petrol | Front-Wheel Drive |
| A6 C5 Avant 2.4Estate | 1998 – 2005 | 2.4L ARN | 136 hp (100 kW) | Petrol | Front-Wheel Drive |
| A6 C5 Avant 2.4Estate | 1998 – 2005 | 2.4L ASM | 136 hp (100 kW) | Petrol | Front-Wheel Drive |
| A6 C5 3.7Saloon | 1999 – 2005 | 3.7L AQG | 260 hp (191 kW) | Petrol | Front-Wheel Drive |
| A6 C5 4.2 quattroSaloon | 1998 – 2005 | 4.2L AWN | 299 hp (220 kW) | Petrol | All-wheel Drive |
| A6 C5 4.2 quattroSaloon | 1998 – 2005 | 4.2L ARS | 299 hp (220 kW) | Petrol | All-wheel Drive |
| A6 C5 4.2 quattroSaloon | 1998 – 2005 | 4.2L ASG | 299 hp (220 kW) | Petrol | All-wheel Drive |
| A6 C5 4.2 quattroSaloon | 1998 – 2005 | 4.2L ART | 299 hp (220 kW) | Petrol | All-wheel Drive |
| A6 C5 Avant 1.8 T quattroEstate | 1997 – 2005 | 1.8L AJL | 180 hp (132 kW) | Petrol | All-wheel Drive |
| A6 C5 3.7 quattroSaloon | 1999 – 2005 | 3.7L AQG | 260 hp (191 kW) | Petrol | All-wheel Drive |
| A6 C5 Avant 3.7 quattroEstate | 1999 – 2005 | 3.7L AQG | 260 hp (191 kW) | Petrol | All-wheel Drive |
| A6 C5 Avant 3.7Estate | 1999 – 2005 | 3.7L AQG | 260 hp (191 kW) | Petrol | Front-Wheel Drive |
| A6 C5 Avant 4.2 quattroEstate | 1998 – 2005 | 4.2L ASG | 299 hp (220 kW) | Petrol | All-wheel Drive |
| A6 C5 Avant 4.2 quattroEstate | 1998 – 2005 | 4.2L ARS | 299 hp (220 kW) | Petrol | All-wheel Drive |
| A6 C5 1.8 TSaloon | 1997 – 2005 | 1.8L AJL | 180 hp (132 kW) | Petrol | Front-Wheel Drive |
| A6 C5 Avant 1.8 TEstate | 1999 – 2005 | 1.8L AJL | 180 hp (132 kW) | Petrol | Front-Wheel Drive |
| A6 C5 S6 quattroSaloon | 1999 – 2005 | 4.2L ANK | 340 hp (250 kW) | Petrol | All-wheel Drive |
| A6 C5 S6 quattroSaloon | 1999 – 2005 | 4.2L AQJ | 340 hp (250 kW) | Petrol | All-wheel Drive |
| A6 C5 Avant S6 quattroEstate | 1999 – 2005 | 4.2L ANK | 340 hp (250 kW) | Petrol | All-wheel Drive |
| A6 C5 Avant S6 quattroEstate | 1999 – 2005 | 4.2L AQJ | 340 hp (250 kW) | Petrol | All-wheel Drive |
| A6 C5 Avant S6 quattroEstate | 1999 – 2005 | 4.2L BBD | 340 hp (250 kW) | Petrol | All-wheel Drive |
| A6 C5 2.5 TDISaloon | 2000 – 2005 | 2.5L AKE | 180 hp (132 kW) | Diesel | Front-Wheel Drive |
| A6 C5 2.5 TDISaloon | 2000 – 2005 | 2.5L BAU | 180 hp (132 kW) | Diesel | Front-Wheel Drive |
| A6 C5 2.5 TDISaloon | 2000 – 2005 | 2.5L BDH | 180 hp (132 kW) | Diesel | Front-Wheel Drive |
| A6 C5 2.5 TDI quattroSaloon | 2000 – 2005 | 2.5L AKE | 180 hp (132 kW) | Diesel | All-wheel Drive |
| A6 C5 2.5 TDI quattroSaloon | 2000 – 2005 | 2.5L BAU | 180 hp (132 kW) | Diesel | All-wheel Drive |
| A6 C5 2.5 TDI quattroSaloon | 2000 – 2005 | 2.5L BDH | 180 hp (132 kW) | Diesel | All-wheel Drive |
| A6 C5 Avant 2.5 TDIEstate | 2000 – 2005 | 2.5L AKE | 180 hp (132 kW) | Diesel | Front-Wheel Drive |
| A6 C5 Avant 2.5 TDIEstate | 2000 – 2005 | 2.5L BAU | 180 hp (132 kW) | Diesel | Front-Wheel Drive |
| A6 C5 Avant 2.5 TDIEstate | 2000 – 2005 | 2.5L BDH | 180 hp (132 kW) | Diesel | Front-Wheel Drive |
| A6 C5 Avant 2.5 TDI quattroEstate | 2000 – 2005 | 2.5L AKE | 180 hp (132 kW) | Diesel | All-wheel Drive |
| A6 C5 Avant 2.5 TDI quattroEstate | 2000 – 2005 | 2.5L BAU | 180 hp (132 kW) | Diesel | All-wheel Drive |
| A6 C5 Avant 2.5 TDI quattroEstate | 2000 – 2005 | 2.5L BDH | 180 hp (132 kW) | Diesel | All-wheel Drive |
| ALLROAD C5 2.5 TDI quattroEstate | 2000 – 2005 | 2.5L AKE | 180 hp (132 kW) | Diesel | All-wheel Drive |
| ALLROAD C5 2.5 TDI quattroEstate | 2000 – 2005 | 2.5L BAU | 180 hp (132 kW) | Diesel | All-wheel Drive |
| ALLROAD C5 2.7 T quattroEstate | 2000 – 2005 | 2.7L ARE | 250 hp (184 kW) | Petrol | All-wheel Drive |
| ALLROAD C5 2.7 T quattroEstate | 2000 – 2005 | 2.7L BES | 250 hp (184 kW) | Petrol | All-wheel Drive |
| A6 C5 1.9 TDISaloon | 2000 – 2005 | 1.9L AJM | 115 hp (85 kW) | Diesel | Front-Wheel Drive |
| A6 C5 Avant 1.9 TDIEstate | 2000 – 2005 | 1.9L AJM | 115 hp (85 kW) | Diesel | Front-Wheel Drive |
| A6 C5 1.8Saloon | 1997 – 2005 | 1.8L AFY | 115 hp (85 kW) | Petrol | Front-Wheel Drive |
| A6 C5 2.8Saloon | 1997 – 2000 | 2.8L AGE | 180 hp (132 kW) | Petrol | Front-Wheel Drive |
| A6 C5 2.8Saloon | 1999 – 2005 | 2.8L ATX | 190 hp (140 kW) | Petrol | Front-Wheel Drive |
| A6 C5 Avant 1.8Estate | 1998 – 2005 | 1.8L AFY | 115 hp (85 kW) | Petrol | Front-Wheel Drive |
| A6 C5 Avant 2.8Estate | 1997 – 2000 | 2.8L AGE | 180 hp (132 kW) | Petrol | Front-Wheel Drive |
| A6 C5 Avant 2.8Estate | 1999 – 2005 | 2.8L ATX | 190 hp (140 kW) | Petrol | Front-Wheel Drive |
| A6 C5 2.4Saloon | 1997 – 2005 | 2.4L APC | 156 hp (115 kW) | Petrol | Front-Wheel Drive |
| A6 C5 Avant 2.4Estate | 1997 – 2005 | 2.4L APC | 156 hp (115 kW) | Petrol | Front-Wheel Drive |
| A6 C5 2.0Saloon | 2001 – 2005 | 2.0L ALT | 130 hp (96 kW) | Petrol | Front-Wheel Drive |
| A6 C5 3.0Saloon | 2001 – 2005 | 3.0L ASN | 220 hp (162 kW) | Petrol | Front-Wheel Drive |
| A6 C5 3.0 quattroSaloon | 2001 – 2005 | 3.0L ASN | 220 hp (162 kW) | Petrol | All-wheel Drive |
| A6 C5 2.4Saloon | 2001 – 2005 | 2.4L BDV | 170 hp (125 kW) | Petrol | Front-Wheel Drive |
| A6 C5 2.4 quattroSaloon | 2001 – 2005 | 2.4L BDV | 170 hp (125 kW) | Petrol | All-wheel Drive |
| A6 C5 2.5 TDISaloon | 2001 – 2005 | 2.5L AYM | 155 hp (114 kW) | Diesel | Front-Wheel Drive |
| A6 C5 2.7 T quattroSaloon | 2001 – 2005 | 2.7L ARE | 250 hp (184 kW) | Petrol | All-wheel Drive |
| A6 C5 2.7 T quattroSaloon | 2001 – 2005 | 2.7L BES | 250 hp (184 kW) | Petrol | All-wheel Drive |
| A6 C5 1.9 TDISaloon | 2001 – 2005 | 1.9L AWX | 130 hp (96 kW) | Diesel | Front-Wheel Drive |
| A6 C5 1.9 TDISaloon | 2001 – 2005 | 1.9L AVF | 130 hp (96 kW) | Diesel | Front-Wheel Drive |
| A6 C5 Avant 2.0Estate | 2001 – 2005 | 2.0L ALT | 130 hp (96 kW) | Petrol | Front-Wheel Drive |
| A6 C5 Avant 2.4Estate | 2001 – 2005 | 2.4L BDV | 170 hp (125 kW) | Petrol | Front-Wheel Drive |
| A6 C5 Avant 2.4 quattroEstate | 2001 – 2005 | 2.4L BDV | 170 hp (125 kW) | Petrol | All-wheel Drive |
| A6 C5 Avant 2.5 TDIEstate | 2001 – 2005 | 2.5L AYM | 155 hp (114 kW) | Diesel | Front-Wheel Drive |
| A6 C5 Avant 2.7 T quattroEstate | 2001 – 2005 | 2.7L ARE | 250 hp (184 kW) | Petrol | All-wheel Drive |
| A6 C5 Avant 2.7 T quattroEstate | 2001 – 2005 | 2.7L BES | 250 hp (184 kW) | Petrol | All-wheel Drive |
| A6 C5 Avant 3.0Estate | 2001 – 2005 | 3.0L ASN | 220 hp (162 kW) | Petrol | Front-Wheel Drive |
| A6 C5 Avant 3.0 quattroEstate | 2001 – 2005 | 3.0L ASN | 220 hp (162 kW) | Petrol | All-wheel Drive |
| A6 C5 Avant 1.9 TDIEstate | 2001 – 2005 | 1.9L AVF | 130 hp (96 kW) | Diesel | Front-Wheel Drive |
| A6 C5 Avant 1.9 TDIEstate | 2001 – 2005 | 1.9L AWX | 130 hp (96 kW) | Diesel | Front-Wheel Drive |
| A6 C5 RS6 quattroSaloon | 2002 – 2005 | 4.2L BCY | 450 hp (331 kW) | Petrol | All-wheel Drive |
| A6 C5 Avant RS6 quattroEstate | 2002 – 2005 | 4.2L BCY | 450 hp (331 kW) | Petrol | All-wheel Drive |
| A6 C5 2.4Saloon | 1997 – 2005 | 2.4L AMM | 163 hp (120 kW) | Petrol | Front-Wheel Drive |
| A6 C5 2.4Saloon | 1997 – 2005 | 2.4L AJG | 163 hp (120 kW) | Petrol | Front-Wheel Drive |
| A6 C5 2.4Saloon | 1997 – 2005 | 2.4L APZ | 163 hp (120 kW) | Petrol | Front-Wheel Drive |
| A6 C5 2.4 quattroSaloon | 1997 – 2005 | 2.4L APZ | 163 hp (120 kW) | Petrol | All-wheel Drive |
| A6 C5 2.4 quattroSaloon | 1997 – 2005 | 2.4L AJG | 163 hp (120 kW) | Petrol | All-wheel Drive |