Removing and installing injector for reducing agent N474 - vehicles with engine codes CTBA and CTBC — AUDI
Removing and installing injector for reducing agent N474 - vehicles with engine codes CTBA and CTBC on Audi: 10 steps, engines CDUD, CGQB, CPNB, CTBA.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi Q5 (8R, 2008–2017)
- Renewed: retaining clip
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- Hold a clean cloth under the separating point to catch escaping reducing agent.
- Renew retaining clip and gasket.
📐 1 workshop diagram for CDUD
Real factory drawings for this job — timing marks, bolt locations and routing. Locked in the free view.
📋 Procedure
- ⚠ Reducing agent can cause skin irritation.Observe safety measures when handling reducing agent .Wear safety goggles. — Remove engine cover panel .
- Remove body brace Running gear, axles, steering40Suspension strut, upper links; Removing and installing body brace.
- Take electrical connector (arrow) out of bracket, unplug it and move it clear. [Note: Hold a clean cloth under the separating point to catch escaping reducing agent.]
- Press release tabs (arrows) and disconnect metering line (1) from injector for reducing agent N474.
- Fold up heat insulation sleeves on coolant hoses.
- Clamp off coolant hoses (2) with hose clamps 3094 and detach.
- Release retaining clip (1) and detach injector for reducing agent N474. [Note: Renew retaining clip and gasket.]
- Install body brace Running gear, axles, steering40Suspension strut, upper links; Removing and installing body brace.
- Install engine cover panel .
- Adapt learnt value after draining reducing agent or renewing components .
Ask TorqFix about your Audi CDUD — it answers with the exact sequence for that engine and the workshop drawing for each step. First question is free after a 20-second sign-up, no card.
Ask about your Audi CDUD — free → or sign up free to see the drawingsOther AUDI procedures
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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 →Workshop data on this page last updated 20 Sep 2026.