Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
3.0L (A4 & A6 - Engine Code AVK)
Engine identification is visible first after preparations. Remove front engine cover (arrows). See Fig 1 . A sticker containing "engine code" and "production number" (arrow) is located on the housing for vacuum diaphragm for intake manifold adjustment. See Fig 2 .
If the sticker is not present and the "engine identification" is required, remove the rear engine cover (arrows). See Fig 3 . Engine codes are stamped on rear of cylinder block, left side. See Fig 4 .
If the sticker is not present and the "engine identification" and "production number" proceed as follows. Remove bolts (arrows) and remove vacuum diaphragm for intake manifold adjustment. See Fig 5 . Remove compression spring which is behind it and set off to the side the vacuum diaphragm with connected lines. The engine code ("engine code" and production number") are located at the front of cylinder head, on top. See Fig 6 .
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.