Removing and installing pump for reducing agent V437: VW Touareg II (CNRB, CVVA, CVWA)
Step-by-step removing and installing pump for reducing agent V437 for the VW Touareg II: 12 steps. What to remove, in what order, and what to check after.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Touareg II (7P, 2010–2018)
- Renewed: seals
📋 Procedure
- ⚠ 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 reduction agent tank .
- ⚠ 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 of the reduction agent along with subsequent crystallisation of the reduction agent. — Pull off ventilation line (arrow).
- Pull all electrical connections off pump for reducing agent V437.
- If necessary, remove reducing agent line from retainer and disconnect from pump as follows:
- First, press securing clip for line connection together in (direction of arrow 1) as shown, and pull off delivery line (A) in direction of (arrow 2) without tools and without »jerking«.
- Unscrew securing bolts (A) and pull pump for reducing agent V437 off upwards.
- Renew seals and .
- Install pump for reducing agent V437 from above in a straight line.
- Insert securing bolts (A) and tighten to specified torque .
- Connect wiring harness to pump for reducing agent V437.
- Connect delivery line to pump for reducing agent V437.
- Install reduction agent tank .
Other VW procedures
- Renewing valve stem seals with cylinder head removed – VW CDLJ
- Removing and installing radiator module – VW 3.0 TDI
- Removing and installing engine mountings and engine cross member
- Removing and installing catalytic converter – VW Polo 6C
- Checking return flow rate of injectors with engine running
- 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
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.