Removing and installing reducing agent supply line: VW 2.0 TDI (CFFA, CFFB, CFFD, CFGB, …)

🧭 Before you start

Fits: VW Passat CC (357, 2008–2012), VW Passat B7 saloon (362, 2010–2014), VW Passat B7 Variant (365, 2010–2014)

🔧 Engine codes this applies to

📋 Procedure

1. ⚠ The reducing agent can irritate skin, eyes and respiratory organs.After skin contact with this agent, wash immediately with plenty of water.If necessary, call a doctor. — Remove left underbody cladding.
2. Remove heat shield above rear axle.
3. Open delivery line clips while moving upper part in (direction of arrow).
4. ⚠ Protect separated electrical connections against wetting with a reducing 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 reducing agent. — Unclip connections from retainer above rear axle and unplug 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 connections 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 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 expose delivery line, pull out of remaining clips and remove.
8. ⚠ The supply 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 plug and connect delivery line to injector for reducing agent N474.
10. Press delivery line into its clips from front to rear.
11. Close securing clips.
12. Remove plug.
13. Connect wires (B) and supply line (A) above rear axle. Secure in retainer on body.
14. Re-install heat shield above rear axle.
15. Re-install underbody cladding on driver side.

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