Removing and installing secondary air inlet valve N112 — VW
Removing and installing secondary air inlet valve N112 on VW: 11 steps, engines CAWB, CBFA, CCTA, CCZA.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Golf VII Variant (BA), VW Golf VII (5G, 2012–2020), VW Sharan II / SEAT Alhambra (7N, 2010–), VW Passat B8 (3G, 2014–)
🔧 Engine codes this applies to
📋 Procedure
- Remove air filter housing .
- Remove battery tray Electrical system27Battery; Removing and installing battery tray.
- Move electrical wiring harnesses (1, 2) clear at air pipe.
- Loosen screw-type clip (3).
- Unscrew bolts (arrows), and remove air pipe.
- Pull connector (3) off sender 1 for secondary air pressure G609(1), and unclip sender.
- Release both retaining tabs (arrow) of sender 1 for secondary air pressure G609, and pull sender 1 for secondary air pressure G609(1) off connecting wire (2).
- Pull connector (3) off secondary air inlet valve N112(2).
- Pull off connecting pipe (1). To do this, press retaining ring together on both sides.
- Unscrew bolts (arrows) from secondary air inlet valve N112(1).
- Unscrew bolts (arrows), and remove secondary air inlet valve N112(1).
Other VW procedures
- Separating gearbox from engine and assembling
- Removing and installing air mass meter – VW Jetta VI · 1 torque figures
- Removing and installing tensioner for poly V-belt (Golf, Eos, Scirocco)
- Removing and installing pistons – Audi A3
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- 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.