A6 is one of the great cars by the German car manufacturer Audi. Here is a table of codes for all the engines so far used in the A6, knowing the engine code really helps when you are looking to buy a replacement engine for your A6.
| Audi A6 Engine Size | Audi A6 Engine Code | Fuel Type | Years |
| 1.8Litre | ADR | Petrol | (94-97) |
| 1.8Litre | AEB | Petrol | (97-05) |
| 1.8Litre | AJL | Petrol | (97-05) |
| 1.8Litre | AJP | Petrol | (97-05) |
| 1.8Litre | ANB | Petrol | (97-05) |
| 1.8Litre | APU | Petrol | (97-05) |
| 1.8Litre | AQE | Petrol | (97-05) |
| 1.8Litre | ARH | Petrol | (97-05) |
| 1.8Litre | AWT | Petrol | (97-05) |
| 2.0Litre | AAE | Petrol | (94-97) |
| 2.0Litre | ABK | Petrol | (94-97) |
| 2.0Litre | ACE | Petrol | (94-97) |
| 2.0Litre | ALT | Petrol | (97-05) |
| 2.0Litre | BPJ | Petrol TFSI | (05-11) |
| 2.0Litre | BYK | Petrol TFSI | (05-11) |
| 2.3Litre | AAR | Petrol | (94-97) |
| 2.4Litre | AGA/AJG | Petrol | (97-05) |
| 2.4 Litre | ARJ | Petrol | (97-05) |
| 2.4 Litre | ARN | Petrol | (97-05) |
| 2.4 Litre | ASM | Petrol | (97-05) |
| 2.4 Litre | BDV | Petrol | (97-05) |
| 2.4 Litre | BDW | Petrol | (05-11) |
| 2.6 Litre | ABC | Petrol | (94-97) |
| 2.7 Litre | AJK | Petrol | (97-05) |
| 2.8 Litre | AAH | Petrol | (94-97) |
| 2.8 Litre | ACK | Petrol | (94-97) |
| 2.8 Litre | ACK | Petrol | (97-05) |
| 2.8 Litre | AGE | Petrol | (97-05) |
| 2.8 Litre | ALG | Petrol | (97-05) |
| 2.8 Litre | AMX | Petrol | (97-05) |
| 2.8 Litre | APR | Petrol | (97-05) |
| 2.8 Litre | AQD | Petrol | (97-05) |
| 2.8 Litre | ATX | Petrol | (97-05) |
| 2.8 Litre | BDX | PetrolFSI | (05-11) |
| 2.8 Litre | CCDA | PetrolFSI | (05-11) |
| 2.8 Litre | CCEA | PetrolFSI | (05-11) |
| 3.0 Litre | ASN | Petrol | (97-05) |
| 3.0 Litre | BBJ | Petrol | (05-11) |
| 3.0 Litre | BBJ | Petrol | (97-05) |
| 3.0 Litre | CAJA | PetrolTFSI | (05-11) |
| 3.2 Litre | AUK | PetrolFSI | (05-11) |
| 3.2 Litre | BKH | PetrolFSI | (05-11) |
| 3.2 Litre | CALA | PetrolFSI | (05-11) |
