Where is the engine number located on an old Audi A6 V6?
2 Answers
The engine number of an old A6 is generally located on the lower left side of the engine. Sometimes, it can also be found on the side of the cylinder block near the flywheel, typically consisting of a combination of 7 to 8 digits and letters. In addition to the above method, the engine number can also be checked through the following 4 ways: The vehicle's driving license contains the engine number, usually located on the second-to-last line; The motor vehicle registration certificate will state the engine number; The purchase invoice will indicate the engine number; The vehicle purchase tax payment certificate will state the engine number. It is important to note that the engine number is not the same as the engine model. The engine model refers to the specifications and size of the engine within the manufacturer's range, and engine models can be the same. The engine number, however, refers to the production number of the engine. Each engine can only have one engine number, and the number for each engine is unique.
When working on my old Audi A6 V6, locating the engine number was no trouble for me. It's typically found on the engine block itself, specifically on the front or side surface of the cylinder block. Open the hood, crouch down, and carefully inspect the middle area of the V6 engine—there should be a metal plate or directly stamped serial number. When I searched for it myself, I used my phone's flashlight for better visibility since older cars tend to accumulate dust; cleaning the area first makes it easier to spot. The exact position may vary slightly by model year, but it's generally in that area. Why is this number important? For tasks like maintenance or used car transactions, it helps match original factory data and avoid counterfeit parts. I also recommend checking when the engine is cold to prevent burns, and while you're at it, inspect for any wiring wear. Online forums like the Audi veteran owners' community have detailed photo guides, which are quite handy, but nothing beats verifying it yourself. Overall, it might take some effort to spot, but it's definitely worth doing.
