Renewing paper filter on vaporiser — AUDI
Renewing paper filter on vaporiser on Audi: 20 steps, engines BCA, BGU, BSE, BSF. 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: VW Caddy III (2K, 2004–2015); platform code 2C0
Don't miss
- Check seal in the filter housing for damage. This must be replaced if necessary.
- Note installation position of pin (2).The tappet must be inserted as shown in the picture.
- Do not damage seal of filter housing.
- When installing ensure gas mode high-pressure valve N372 is installed in correct position.
📋 Procedure
- Empty the gas line
- Remove air filter with air filter housing 24Assembly overview - air filter.
- Remove batteryA and battery tray Electrical system27Removing and installing battery.
- ⚠ There is a danger from escaping gas.The system is pressurised.Wear protective gloves and eye protection.Before opening the system place a cloth around the connection. Then release pressure by carefully loosening the connection. — Carefully undo the screwed connection (arrow) on gas line (1) at the gas inlet of the filter housing and wait until the residual gas has escaped.
- Then unscrew screwed connection on gas line (1) fully and lay the gas line to one side.
- Disconnect connector (2) on gas mode high-pressure valve N372(1).
- Undo the screwed connection (arrow) of the filter housing with the gas mode hight pressure valve N372. Remove filter housing.
- Using circlip pliers, remove circlip (arrow) from filter housing.
- Remove the filter housing cover(4) and remove the filter element (3).
- Check seal in the filter housing for damage. This must be replaced if necessary.
- Insert new paper filter(4). [Note: Note installation position of pin (2).The tappet must be inserted as shown in the picture.]
- Press the filter housing cover (4) up to the stop in the solenoid valve (1). Secure with circlip (5). [Note: Do not damage seal of filter housing.]
- Secure gas mode high pressure valve N372 to the vaporiser using the 19 mm insert tool T10455. [Note: When installing ensure gas mode high-pressure valve N372 is installed in correct position.]
- Connect the gas line (1) to the gas inlet (arrow) of the filter housing.
- Attach connector (2) to gas mode high-pressure valve N372(1).
- Install battery carrier.
- Install battery Electrical system27Disconnecting and reconnecting battery.
- Install air filter with air filter housing 24Assembly overview - air filter.
- Carry out a gas system test (GAP) once installation is complete 39.
- Read out event memory with vehicle diagnosis system, testing and information systemVAS 5051B or subsequent equipment. Repair any faults according to repair guidelines.
Other AUDI procedures
- Part I: assembly overview - toothed belt drive
- Assembly overview - parts of cooling system (radiator with two fans), body side
- Assembly overview - part I, belt drive
- Assembly overview - exhaust manifold with catalytic converter and add-on parts
- Removing and installing natural gas tanks 1 and 2
- Removing and installing toothed belt – Audi · 56 torque figures
- 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
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.