TorqFix

Removing and installing four-wheel drive control unit J492, rear final drive "“02D/0AV”" — VW

Removing and installing four-wheel drive control unit J492, rear final drive "“02D/0AV”" on VW: 18 steps.

Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.

18 steps

🧭 Before you start

Fits: VW Golf V / Jetta (1K, 2003–2009); platform code AJ5

Don't miss

  • Valve seals have different inner diameters.Lubricate seals with high-performance oil for Haldex coupling before installing.
  • Marking (arrow B) on convex side of dished washer (2) faces upwards and towards pressure sensor in installation position (1).
  • The cover fits in only one position.
  • The valve fits only in one position.
  • The sender fits in only one position.

📋 Procedure

  1. Switch off ignition.
  2. Separate connectors (1) and (2) of control unit on top.
  3. Place drip tray under rear final drive.
  4. Remove bolts (arrows).
  5. Carefully remove control unit (A).
VW? Steps differ between engine variants — check this job against your exact car before you commit to it. Check my car — free →
  1. Carefully grasp coupling opening control valve N373(A) on metal housing (arrow) using pliers and pull out.
  2. Pull out pressure sensor (B).
  3. Remove seal for coupling opening control valve N373(arrow) from housing. [Note: Valve seals have different inner diameters.Lubricate seals with high-performance oil for Haldex coupling before installing.]
  4. First fit seal (1) onto coupling opening control valve N373.
  5. Then seals (2) and (3).
  6. Press centring lips (Qty. 4) of seal (3) into groove.
  7. Renew seal (arrow A) on pressure sensor. [Note: Marking (arrow B) on convex side of dished washer (2) faces upwards and towards pressure sensor in installation position (1).]
  8. Put dished washer (2) pressure sensor (1) with convex side facing sensor.
  9. Set new cover (2) on control unit (1). [Note: The cover fits in only one position.]
  10. Insert coupling opening control valve N373(3) into control unit (1). [Note: The valve fits only in one position.]
  11. Insert oil pressure and oil temperature sender G437(4) into control unit (1). [Note: The sender fits in only one position.]
  12. Carefully set control unit (A) in place and tighten bolts (arrows) to specified torque .
  13. Check oil level in Haldex coupling .

Other VW procedures

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

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Workshop data on this page last updated 20 Sep 2026.