Removing and installing injector for reducing agent N474 — AUDI
Removing and installing injector for reducing agent N474 on Audi: 15 steps, engines BJJ, BJK, BJL, BJM.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Caddy IV (SA, 2015–2020)
- Renewed: seals
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- Place a cloth underneath separating point to catch any escaping reducing agent.
- Renew seals.Secure all hose connections with the hose clips corresponding to original equipment Electronic Parts Catalogue (ETKA).
🔧 Engine codes this applies to
📐 16 workshop diagrams for BJJ
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
- Disconnect connector of injector for reducing agent N474 on plenum chamber bulkhead.
- Lay wiring harness to side. [Note: Place a cloth underneath separating point to catch any escaping reducing agent.]
- Detach coolant hoses with clamps up to 25 mm 3094.
- Loosen clamps (3).
- Pull off coolant hoses.
- Loosen clip (1).
- Remove injector for reducing agent N474.
- Release reducing agent line (2).
- Press together securing clip of line (1) in (direction of arrow 1), as shown in illustration, to pull off line.
- Pull off delivery line in (direction of arrow 2) without tools and without jerking.
- Seal off all open lines and connections with clean plugs from engine bung set VAS 6122. [Note: Renew seals. Secure all hose connections with the hose clips corresponding to original equipment Electronic Parts Catalogue.]
- Connect (see the separate procedure).
- Switch ignition on.
- Adapt SCR system learnt values , 01 - Systems capable of self-diagnosis, 01 - Diesel direction injection and preglow system EDC 17, 01 - Engine electronics functions, 01 - Adapting SCR system learnt values.
- Follow further instructions displayed on (see the separate procedure).
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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 → · How these pages are made →Workshop data on this page last updated 20 Sep 2026.