Note. For repair procedures not covered in this article, see ENGINE OVERHAUL PROCEDURES article in GENERAL INFORMATION.
Engine can be identified by code and serial number stamped on right side of engine block, in front of right (passenger side) cylinder head. See ENGINE IDENTIFICATION CODES and (Scheme 1). Engine code is also identified on vehicle data label.
| Engine | Code | |
|---|---|---|
| Audi | ||
| A4 & A6 | AHA & ATQ | |
ENGINE IDENTIFICATION CODES