Removing and installing injector for reduction agent N474 — AUDI

🧭 Before you start

Fits: platform codes 2EA, 2FC

🔧 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.

📐 25 workshop diagrams for CKTB

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

📋 Procedure

1. ⚠ Immediately seal all open lines and connections using suitable plugs to prevent ingress of dirt. The smallest particle of dirt can cause extensive damage to the system.Protect disconnected connectors against wetting from reducing agent by suitable means, e.g. a plastic bag and cable ties. Electrical connections may be damaged due to the high penetration ability along with subsequent crystallisation of the reducing agent. — Push hydraulic connection of delivery line (1) as far as stop onto injector for reducing agent N474(4); then press securing clips (arrow), and pull off connection. Seal open connections to prevent ingress of dirt.
2. Release and disconnect connector (2).
3. Remove clamp (3), and remove injector for reducing agent N474(4).
4. Connect injector for reducing agent N474(4) with new sealing washer to SCR catalytic converter observing lugs (electrical connector (2) faces upwards).
5. Place new securing clamp (3) over connection, and press it until it engages. The injector for reducing agent N474 is then fixed in position.
6. Start securing clamp bolt (3), and tighten it to 5 Nm . — 5 Nm (3.7 lb-ft)
7. First, fit and engage connector (2).
8. Then, fit and engage hydraulic connector of delivery line (1).

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