Checking compression pressure: Audi A6 C6 (AWM, AWT, BVJ)

🧭 Before you start

Fits: Audi A6 C6 (4F, 2004–2011)

Don't miss

• The larger connector (2) remains connected.
• Disregard (item 5).
• Using the compression tester Operating instructions.

🔧 Engine codes this applies to

📋 Procedure

1. Switch off ignition.
2. Remove engine control unit J62324.
3. Pull retaining tab (arrow) to unplug only the smaller connector (1) from engine control unit. [Note: The larger connector (2) remains connected.]
4. Remove bolts (arrows).
5. Remove air ducts (1 and 2).

6. Move clear fuel line at air cleaner housing and at air pipe and line leading to activated charcoal filter.
7. Unplug electrical connector (1) at air mass meter G70.
8. Detach vacuum line (3) leading to air intake hose.
9. Disconnect hose (2) for crankcase breather system from air hose by pressing release tabs.
10. Remove air intake hose with air mass meter G70. To do so, release hose clip (4) and clamps (arrows).
11. ⚠ Risk of violating emission legislation applying to USA models.Do NOT open hose connection (2). — Move air intake hose clear to one side (crankcase breather hose (2) remains connected). To do so, release hose clip (4) and clamps (arrows). [Note: Disregard (item 5).]
12. Loosen clamps (arrows) and detach top section of air cleaner housing.
13. Unbolt coolant expansion tank (arrow) and disconnect electrical connector for coolant shortage indicator switch F66 at bottom of coolant expansion tank.
14. Lay aside coolant expansion tank with coolant hoses (1, 2, 3) connected.
15. Pull dipstick (1) out of guide tube.
16. Remove bolts (2 and 3).
17. Unplug electrical connectors at ignition coils.
18. Push wiring harness to one side.
19. Remove bolts (1 and 2).
20. Unplug electrical connectors at ignition coils.
21. Push wiring harness to one side.
22. Pull all ignition coils out with puller T40039.
23. Remove spark plugs with spark plug socket and extension3122 B.
24. Test the compression pressure with the compression testerV.A.G 1763. [Note: Using the compression tester Operating instructions.]
25. Have a 2nd mechanic press down the accelerator pedal completely and simultaneously operate the starter until the pressure no longer increases on the tester display.
26. Install spark plugs 405.
27. Install engine control unit J62324.
28. Erase any entries in event memory , Guided Functions, Interrogate event memory, then Generate readiness code.

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