Removing and installing tank for reduction agent — VW

🔧 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.

📐 18 workshop diagrams for CATA

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

📋 Procedure

1. ⚠ The reduction agent can irritate skin, eyes and respiratory organs.After skin contact with this agent, wash immediately with plenty of water.If necessary seek advice from a doctor. — Empty tank for reduction agent.
2. Remove silencer .
3. Remove heat shield for silencer.
4. Detach anti-roll bar for real axle and swing it downwards. Running gear, axles, steering42.
5. Position engine and gearbox jackV.A.G 1383 A under reduction agent tank.

6. Unscrew securing nuts (arrows) and support reduction agent tank in installation position with engine and gearbox jackV.A.G 1383 A.
7. Carefully lower reduction agent tank until upper part of insulation can be removed.
8. ⚠ Protect separated electrical connections against wetting from reduction agent by suitable means, e.g. plastic bag and cable ties. Electrical connections may be damaged due to the high penetration ability along with subsequent crystallisation of the reduction agent. — Disconnect connector (B).
9. First press securing clip for line connection on injector for reduction agent N474 together in direction of (arrow 1.) as shown, and pull off delivery line (A) in direction of (arrow 2.) without tools and without »jerking«.
10. ⚠ Immediately seal all openings and unions using suitable plugs to stop ingress of dirt. The smallest particle of dirt can cause extensive damage to the system. — Pull connector (arrow) off evaluation unit for reduction agent tank G698, located on left side of reduction agent tank.
11. Disconnect connector (1) on right side of reduction agent tank.
12. Pull connectors (arrows) off control unit for reduction agent heater J891.
13. Unclip protective tube (A) and lines from reduction agent tank.
14. Remove lines from protective tube (A).
15. Pull connections (arrows) off pump for reduction agent V437.
16. Remove complete wiring harness from reduction agent tank.
17. Remove reduction agent tank downwards.
18. Carefully raise tank for reduction agent using engine and gearbox jackV.A.G 1383 A until electrical wiring and supply line can be reconnected.
19. Fit upper part of insulation on reduction agent tank. [Note: Ensure all components are installed on tank for reduction agent, the upper insulation is fitting exactly and that no lines are squeezed.]
20. Carefully raise tank for reduction agent further using engine and gearbox jackV.A.G 1383 A until securing nuts can be started.
21. Tighten securing nuts. Specified torque: 20 Nm — 20 Nm (15 lb-ft)
22. Fill tank for reduction agent .

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