Removing and installing all-wheel drive control unit J492, final drive 02D, 0AV — AUDI
Removing and installing all-wheel drive control unit J492, final drive 02D, 0AV on Audi: 18 steps. What to remove, in what order, and what to check after.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi A3 (8P, 2003–2012), Audi TT Mk2 (8J, 2006–2014)
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- Lubricate seals with high performance oil for Haldex coupling before fitting.The seals for the valve have different internal diameters.
- When installed, the marking (arrow B) on the convex side of the dished spring (2) points to the top and to pressure sensor (1).
- The cover can only be fitted in one position.
- The valve can only be fitted in one position.
- The sender can only be fitted in one position.
📋 Procedure
- Switch off ignition.
- Unplug connectors (1) and (2) at top of control unit.
- Position drip tray under final drive.
- Remove bolts (arrows).
- Carefully detach control unit (A).
- Carefully take hold of coupling opening control valve N373(A) at metal housing (arrow) using pliers, and pull out.
- Remove pressure sensor (B).
- Remove seal for coupling opening control valve N373(arrow) from housing. [Note: Lubricate seals with high performance oil for Haldex coupling before fitting.The seals for the valve have different internal diameters.]
- First fit seal (1) onto coupling opening control valve N373.
- Then fit seals (2) and (3).
- Press centring lips (4x) of seal (4) into groove.
- Renew seal (arrow A) at pressure sensor. [Note: When installed, the marking (arrow B) on the convex side of the dished spring (2) points to the top and to pressure sensor (1).]
- Fit dished spring (2) with convex side first onto pressure sensor (1).
- Fit new cover (2) onto control unit (1). [Note: The cover can only be fitted in one position.]
- Insert coupling opening control valve N373(3) in control unit (1). [Note: The valve can only be fitted in one position.]
- Fit oil pressure and oil temperature sender G437(4) with dished spring into control unit (1). [Note: The sender can only be fitted in one position.]
- Carefully fit control unit (A) and tighten bolts (arrows) to torque .
- Check oil level in Haldex coupling .
Other AUDI procedures
- Removing and installing toothed belt – Audi · 56 torque figures
- Removing engine – Audi A8 D3 · 41 torque figures
- Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing camshaft timing chain · 29 torque figures
Who makes these pages, and how
TorqFix was built by a mechanic — after a 2,700 km drive with five roadside repairs that no diagnostic tool could explain.
The figures on this page come from manufacturer workshop documentation and are shown as they are. The page is assembled automatically from that data — it is not written by an AI. The AI works in the chat, where it answers for your specific car. It writes nothing here.
Variants of the same model differ. Cross-check torque against the factory manual for your engine before final tightening.
Seen a figure that does not match your manual? Write to us — we correct it and note when. support@torqfix.com
The story behind TorqFix →Workshop data on this page last updated 20 Sep 2026.