Removing engine - vehicles with biturbo engine: Audi A6/A7 C7 (CDUC, CDUD, CGQB, CKVB, …)

🧭 Before you start

Fits: Audi A6/A7 C7 (4G, 2011–2018)

• Opens: refrigerant (A/C)
• Special tools named: VAS 6131/11, VAS 6131/13, VAS 6131/10

Don't miss

• Collect drained coolant in a clean container for re-use or disposal.
• Disregard (item 1).
• Disregard (items 1, 2).
• Danger of damage to refrigerant lines and hoses.Do NOT stretch, kink or bend refrigerant lines and hoses. — Remove bolt (2), disconnect refrigerant line from air conditioner compressor and move to one side.
• Disregard (items 1, 3).

🔧 Engine codes this applies to

🔩 Torque settings

Values can differ between engine variants — check the code stamped on your block.

ℹ️ Always cross-check the exact figure against your vehicle's factory manual before final tightening — a wrong torque can damage the engine. These values are extracted from workshop data and may not cover every variant or revision.

📐 1 workshop diagram for CDUC

Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.

📋 Procedure

1. ⚠ Make sure the vehicle cannot tip over when the engine is removed.Secure the vehicle, to do so, the luggage compartment must be empty.The fuel system operates at extremely high pressure. This can cause injury.The fuel pressure in the high-pressure section of the injection system must be reduced to a residual pressure prior to opening the system. — Set front wheels to straight-ahead position.
2. ⚠ Electronic components are susceptible to damage.Observe notes on procedure for disconnecting the battery. — Switch off ignition.
3. Disconnect earth wire from battery terminal Electrical system27Battery; Disconnecting and connecting battery.
4. Remove engine cover panel (arrows).
5. Discharge refrigerant system Air conditioner with refrigerant R134a.

6. Remove lock carrier cover General body repairs, exterior63Bumper (front); Removing and installing attachments.
7. ⚠ Hot steam/hot coolant can escape - risk of scalding.The cooling system is under pressure when the engine is hot.To allow pressure to dissipate, cover filler cap on coolant expansion tank with cloth and open carefully. — Open filler cap (arrow) on coolant expansion tank.
8. Remove both front wheels Running gear, axles, steering44Wheels, tyres.
9. Remove wheel housing liners (front left and front right) General body repairs, exterior66Wheel housing liners; Removing and installing wheel housing liner (front).
10. Remove wheel spoilers (front left and front right) General body repairs, exterior66Wheel housing liners; Removing and installing wheel housing liner (front).
11. Remove noise insulation panels General body repairs, exterior66Noise insulation; Removing and installing noise insulation.
12. Remove air intake grille (right-side) General body repairs, exterior63Bumper (front); Removing and installing attachments.
13. If fitted, release fasteners (arrows) and detach cover (1) (right-side). [Note: Collect drained coolant in a clean container for re-use or disposal.]
14. Place drip tray for workshop hoistVAS 6208 beneath engine.
15. Remove drain plug (1) and drain off coolant.
16. Lift retaining clip (2) and disconnect coolant hose from radiator.
17. Release hose clip (arrow), disconnect coolant hose from coolant pipe (bottom left) and drain off coolant.
18. Lift retaining clip (arrow), disconnect coolant hose (rear right) and drain off coolant.
19. Remove plenum chamber cover General body repairs, exterior50Bulkhead; Removing and installing plenum chamber cover.
20. Remove bolts (arrows) and detach air duct (1).
21. Remove bolts (arrows) and detach air duct (2). [Note: Disregard (item 1).]
22. Release hose clips (arrows) and remove air pipe (1).
23. Unplug electrical connector (2) at air mass meter G70 and move clear.
24. Lift off air cleaner housing (1).
25. ⚠ Take care to keep components clean.Observe rules for cleanliness when working on the fuel supply system . — Release hose clips and detach fuel hoses:
26. Lift retaining clip (1) and disconnect coolant hose.
27. Release hose clip (2) and detach vacuum hose.
28. Release hose clip (arrow) and disconnect coolant hose from coolant pipe (front).
29. Release hose clip (3) and detach air hose. [Note: Disregard (items 1, 2).]
30. Disconnect vacuum hose (arrow).
31. Lift retaining clip (2) and disconnect coolant line.
32. Remove bolts (1) and move refrigerant lines clear.
33. ⚠ Danger of damage to refrigerant lines and hoses.Do NOT stretch, kink or bend refrigerant lines and hoses. — Remove bolt (2), disconnect refrigerant line from air conditioner compressor and move to one side.
34. Seal off open lines and connections with clean plugs from engine bung setVAS 6122. [Note: Disregard (items 1, 3).]
35. Unplug electrical connector (2) for charge pressure sender G31/intake air temperature sender G42 and move clear electrical wiring. [Note: Disregard (item 1).]
36. Unscrew NOx sender G295(arrow) and move clear to left side.
37. Remove body brace Running gear, axles, steering40Suspension strut, upper links; Removing and installing body brace.
38. Release retainer (arrow A) and open cover (arrow B).
39. Remove nuts (2, 3 and 4) and move electrical wiring clear.
40. Detach electrical connector (1) from bracket and unplug.
41. Remove nuts (2 and 3) and move electrical wiring clear.
42. Detach electrical connector (1) from bracket and unplug.
43. Remove bolts (arrows) and detach terminal 30 wiring junction 2TV22 from plenum chamber partition panel.
44. Unplug electrical connectors (arrows) from catalytic converter heater control unit 1J1021 and move electrical wiring harness clear.
45. Press foam wedge (1) to one side.
46. Remove bolts (arrows).
47. Unscrew nut (2) on longitudinal member (right-side) and move earth cables clear.
48. Release catch (arrow) to open wiring duct (1) and move electrical wiring harness clear.
49. Unscrew bolts (arrows) and pull filler neck (1) out of washer fluid reservoir and through opening in body to right side.
50. Remove cap nut (2) and move earth wiring clear.
51. Release fastener (arrow), detach engine control unit J623(item 1) from bracket and swivel it to one side.
52. Remove bolts (arrows) and detach cover (1) for electronics box in plenum chamber.
53. Unplug electrical connectors (1) and unscrew nut (2) for electrical wiring.
54. Release catches (arrows) and detach relay carrier with fuse holder (3).
55. Disengage engine wiring harness at electronics box in plenum chamber and move clear.
56. Release catches (arrows A) and lift off wiring protector (1)(arrow B).
57. Place wiring harness on engine and secure engine control unit J623 to prevent it from dropping.
58. Unplug electrical connectors (1, 2) for radiator fan (push retainer to the rear (arrow) and press down release catch).
59. Move clear electrical wiring harness. [Note: Disregard (item 3).]
60. Release hose clip (arrow) and detach air hose from air pipe.

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