Gearbox removal & installation: Audi 1.2 (CBZB)

🧭 Before you start

Fits: Audi A3 (8P, 2003–2012)

• Timing position: the crankshaft or camshaft is set and locked during this job
• Special tools named: T10416/1, T10416, T10416/2, T10416/3, locking pin

Don't miss

• Collect drained coolant in a clean container for re-use or disposal.
• Disregard (item 2).
• Disregard (item 1).
• The bolts (bottom arrows) are removed at a later stage.Disregard (item 1).
• Remove bolts (arrows) and place clutch slave cylinder to one side. Do not open pipes.

🔧 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.

📐 43 workshop diagrams for CBZB

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

📋 Procedure

1. ⚠ 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 on coolant expansion tank.
2. Remove both front wheels.
3. Remove noise insulation 50.
4. Remove front left and front right wheel housing liners (front section) 66.
5. Unplug electrical connector (1) at radiator outlet coolant temperature sender G83. [Note: Collect drained coolant in a clean container for re-use or disposal.]

6. Place drip tray for workshop hoistVAS 6208 beneath engine.
7. Lift retaining clip (3), disconnect coolant hose (bottom left) from radiator and drain off coolant. [Note: Disregard (item 2).]
8. Lift retaining clips (1) and (2) and disconnect coolant hoses (bottom right) from radiator. Drain remaining coolant.
9. Move coolant hose clear (arrow).
10. Pull cover (1) off air duct (release clips on sides (arrows)).
11. Unclip air duct at the bottom by releasing clips (arrows).
12. Release hose clip (1) and detach air hose from turbocharger.
13. Disconnect vacuum hose (2).
14. Unscrew bolt (3) and remove air cleaner housing.
15. Remove battery Electrical system27.
16. Remove bolts (arrows) and take out battery tray (1).
17. Release hose clip (arrow) and disconnect coolant hose (bottom) from coolant expansion tank.
18. Release hose clip (1) and detach coolant hose (top) from coolant expansion tank.
19. Disconnect vacuum hose (2) from activated charcoal filter and move hose clear.
20. Disconnect fuel supply line (2) (pull release ring).
21. ⚠ The fuel system is pressurised.Risk of injury as fuel may spray out.Wear safety goggles.Wear protective gloves.Release pressure (wrap clean cloth around connection and open connection carefully). — Seal off open pipes/lines and connections with clean plugs from engine bung setVAS 6122. [Note: Disregard (item 1).]
22. Press release tab at bottom of bracket and unhook bracket (arrow) from timing chain cover (top) with coolant hoses still attached.
23. Lift retaining clips (1) and (2) and disconnect coolant hoses from heat exchanger for heater.
24. Unplug electrical connector (1).
25. Detach vacuum line (2) from brake servo.
26. Lift retaining clip (arrow) and disconnect coolant hose (top left) from radiator.
27. Remove bolts (top arrows) for radiator cowl.
28. Move coolant hose (2) clear. [Note: The bolts (bottom arrows) are removed at a later stage.Disregard (item 1).]
29. Unclip securing clip (1) for gear selector cable.
30. Detach cable end-piece from gearbox selector lever. [Note: Disregard (item 2).]
31. Pull locking device forwards as far as stop (arrow 1) and lock by turning anti-clockwise (arrow 2).
32. Then press relay lever towards front (arrow 3).
33. Remove bolts (arrows), detach cable support bracket from gearbox and place to one side.
34. Remove bolts (arrows) and place clutch slave cylinder to one side. Do not open pipes.
35. ⚠ Avoid damage to clutch slave cylinder.Do not operate clutch pedal with slave cylinder removed. — Use removal lever80 - 200 to prise selector lever cable (2) off gearbox selector lever.
36. Detach circlip (1) for selector lever cable.
37. ⚠ Risk of damage to selector lever cable.Do not press the selector lever cable rearwards out of the cable support bracket. The selector lever cable is guided out of the cable support bracket at a later stage when lowering the engine/gearbox assembly. — Remove wiper arms Electrical system92.
38. Unclip washer jets (arrow).
39. Push washer jets through assembly opening back into plenum chamber, leaving hoses connected.
40. Remove seal (1).
41. ⚠ Risk of damage to plenum chamber cover.To avoid cracking the plenum chamber cover (2) during removal, apply a small amount of soap solution to the joint between the windscreen and the plenum chamber cover and pull the plenum chamber cover vertically up out of the windscreen surround, starting from the edge of the windscreen. — Pull off plenum chamber cover (2) [Note: Use removal lever80 - 200 to lever out the wiring clips when performing the next work steps.]
42. Move clear engine wiring harness at rear of plenum chamber partition panel.
43. Remove bolts (arrows) and detach plenum chamber partition panel.
44. Remove engine control unit 24.
45. Unplug electrical connector (1) for engine wiring harness. [Note: Disregard (item 2).]
46. Release wiring protector for engine wiring harness (arrow) and lift protector off.
47. Open retainers for wiring duct (arrows). [Note: Disregard (item 1).]
48. Move clear and unplug electrical connector (1).
49. Open retainer (2) of wiring duct (arrow).
50. Remove wiring harness for engine control unit from wiring duct and place on engine.
51. Unplug electrical connector (arrow) at longitudinal member (bottom left). [Note: For illustration purposes, the installation position is shown from below.]
52. Slide the two clips in the direction of the (arrows) and remove cover from electronics box in engine compartment.
53. Remove nut (arrow), detach "“B+”" wire from electronics box in engine compartment and move wire clear.
54. Unscrew bolts (arrows) at engine mounting approx. 2 turns.
55. Loosen bolts (arrows 1) at gearbox mounting approx. 2 turns. [Note: Disregard (arrows 2).]
56. Loosen bolts (arrows) at gearbox mounting (1) approx. 2 turns.
57. Remove nut (1) and detach earth wire. [Note: On some versions the earth wire may be attached to the engine mounting.]
58. Remove nut (3), detach electrical wiring and move clear.
59. Unplug electrical connector (2) and move clear.
60. Unplug electrical connector (2) for Lambda probe G39.

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