Removing and installing reduction agent delivery line: VW Passat CC / Passat B6 (CATA, CBAC, CNRB, CVVA, …)

🧭 Before you start

Fits: VW Passat CC (357, 2008–2012), VW Passat B6 (3C, 2005–2010)

🔧 Engine codes this applies to

📋 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. — Remove left underbody panel.
2. Remove heat shield above rear axle.
3. Open clips of delivery line, open upper part in direction of (arrow) for this.
4. ⚠ 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. — Unclip wiring connection from retainer above rear axle and disconnect electrical connector (B) of delivery line.
5. First press securing clip for line connection together in direction of (arrow 1.) as shown, and pull off delivery line in direction of (arrow 2.) without tools and without »jerking«.

6. ⚠ 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. — 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 in direction of (arrow 2.) without tools and without »jerking«.
7. Carefully release delivery line, pull it out of remaining clips and remove it.
8. ⚠ The delivery line is pre-formed and is equipped with a heater element over the complete length. Ensure the line is not kinked, twisted or stretched. Otherwise, the heater element and thereby the supply line will be damaged. — Guide delivery line carefully behind brake lines and wiring harness for electromechanical parking brake (arrows) above rear axle.
9. Remove sealing plugs and connect delivery line to injector for reduction agent N474.
10. Press delivery line into respective clips, working from front to rear.
11. Close securing clips.
12. Remove blanking plugs.
13. Connect wire (B) and supply line (A) above rear axle. Secure both in their brackets on the body.
14. Reinstall heat shield above rear axle.
15. Reinstall underbody panel on driver's side.

Other VW procedures

• Removing and installing mounting plate for oil cooler, pressure control valve and oil filter housing · 1 torque figures
• Checking return flow rate of injectors (piezo injectors) with engine running.
• Removing and installing lower part of right intake manifold
• Removing and installing reduction agent supply line – VW CATA
• Removing and installing coolant pipe (top right) – Audi A8 D3
• Removing engine · 41 torque figures
• Removing and installing camshaft – VW Golf Cabriolet · 47 torque figures
• Adjusting valve timing – VW Passat B5 · 83 torque figures
• Removing and installing camshafts – VW Passat B6 · 39 torque figures
• Removing and installing coolant pump · 53 torque figures