Removing and installing non-return valve, TDI engine: Audi A1
Step-by-step removing and installing non-return valve, TDI engine for the Audi A1: 11 steps. What to remove, in what order, and what to check after.
Workshop procedure for AUDI — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: Audi A1 (8X, 2010–2018)
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- For easier assembly, moisten the connections of the non-return valve and vacuum hose slightly with water; do not use oil.
📋 Procedure
- Remove engine cover panel 10Engine cover panel; Removing and installing engine cover panel.
- Version for cold climates: Unplug electrical connector (2).
- Press release tabs and disconnect crankcase breather hose (1).
- Disconnect vacuum hose (arrow).
- Release hose clip (4) and disconnect air intake pipe from air cleaner housing.
- Unscrew bolt (3), pivot air intake pipe towards rear and remove.
- Disconnect vacuum hose (2) from brake servo and disconnect hose at connection (1).
- Take off vacuum hose with non-return valve.
- ⚠ Take care not to damage the vacuum hose. The vacuum hose must be renewed if it is damaged. — Locate vacuum hose with non-return valve in installation position and attach connections. [Note: For easier assembly, moisten the connections of the non-return valve and vacuum hose slightly with water; do not use oil.]
- Install air intake pipe 21Charge air system; Exploded view - hose connections for charge air system.
- Install engine cover panel 10Engine cover panel; Removing and installing engine cover panel.
Other AUDI procedures
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- Removing engine – Audi A8 D3 · 41 torque figures
- Removing camshaft timing chain from camshafts – Audi A6/A7 C7 · 38 torque figures
- Installing engine – Audi A8 D4 · 36 torque figures
- Removing and installing camshaft timing chain · 29 torque figures
- Measuring radial clearance of camshafts – Audi Q7 · 2 torque figures
- Removing and installing convenience system central control unit · 2 torque figures
- Renewing oil seal together with sleeve (one-piece sleeve and oil seal for flange shaft (right-side))
- Renewing stub shaft oil seal (right-side) - up to gearbox manufacturing date 31 10 4
- Removing and installing tensioner for poly V-belt – Audi A3 · 1 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.