Removing and installing mechatronic unit - gearbox with 13 bolts on oil pan — AUDI

🧭 Before you start

Fits: Audi A6 C6 (4F, 2004–2011)

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• Wiring harness (B) with connector (C) must be disconnected from the mechatronic unit before removing the mechatronic unit. The wiring harness connector remains in the gearbox housing.
• If the tab (arrow) on the reverse side of the wiring harness breaks off, the wiring harness must be renewed.
• The wiring harness connector remains in the gearbox housing, so the attached harness cannot be removed.
• Loosen only the securing bolts indicated in the illustration (14 ... 1).If other bolts are loosened, this may affect the operation of the mechatronic unit or the mechatronic unit could come apart.
• Make sure that seal (B) is properly inserted and secured.

🔩 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.

📋 Procedure

1. Switch off ignition and take out ignition key.
2. Remove oil pan .
3. Remove ATF strainer .
4. ⚠ The gearbox control unit (mechatronic unit) can be damaged by electrostatic discharge.Before touching or removing the mechatronic unit, always discharge any static electricity by touching vehicle earth or other earthed object with your hand.DO NOT touch contacts in 16-pin connector with your hands, as static discharge can seriously damage the control unit and mechatronic unit. — Touch vehicle earth with your hand (without gloves) to discharge any static electricity. [Note: Wiring harness (B) with connector (C) must be disconnected from the mechatronic unit before removing the mechatronic unit. The wiring harness connector remains in the gearbox housing.] [Note: The following illustrations show the mechatronic unit removed from the gearbox. The wiring harness connector remains in the gearbox housing.]
5. Carefully detach wiring harness (A) from mechatronic unit (B). At the same time, detach tab (arrow) on reverse side of wiring harness from mechatronic unit. [Note: If the tab (arrow) on the reverse side of the wiring harness breaks off, the wiring harness must be renewed.]

6. Carefully detach connector (C) from socket (D) of mechatronic unit.
7. Carefully move wiring harness clear to one side. [Note: The wiring harness connector remains in the gearbox housing, so the attached harness cannot be removed.]
8. Unscrew securing bolts for mechatronic unit in reverse order (i.e. first bolt (14), then (13), ... etc. until (1)). [Note: Loosen only the securing bolts indicated in the illustration (14 ... 1).If other bolts are loosened, this may affect the operation of the mechatronic unit or the mechatronic unit could come apart.]
9. Detach mechatronic unit from gearbox.
10. Make sure that seal (B) is properly inserted and secured.
11. Install mechatronic unit without using force, and at the same time fit pin on gearbox selector lever (arrow) into slot on selector slide (A) (move selector slide backwards and forwards if necessary).
12. Tighten securing bolts (1) and (2) for mechatronic unit to 2 Nm. — 2 Nm (1.5 lb-ft)
13. Tighten securing bolts for mechatronic unit in specified order to specified torque (i.e. first bolt (1), then (2), ... etc. until (14)).
14. Clip wiring harness (B) onto mechatronic unit. To do so, first attach tab (arrow) on reverse side of wiring harness to mechatronic unit. [Note: If the tab on the reverse side of the wiring harness breaks off, the wiring harness must be renewed.]
15. Carefully insert connector (C) in connector socket on mechatronic unit.
16. Install ATF strainer .
17. Install oil pan .
18. Fill up with ATF .
19. Perform gearbox adaption .

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