Checking activated charcoal filter system for leaks: VW Phaeton (AYT, BAN, BAP, BDN, …)
Step-by-step checking activated charcoal filter system for leaks for the VW Phaeton: 24 steps. What to remove, in what order, and what to check after.
Workshop procedure for VW — the exact step sequence and torque figures, straight from real workshop data.
🧭 Before you start
Fits: VW Phaeton (3D)
- Special tools named: V.A.G 1318/12, V.A.G 1318/13, V.A.G 1318/17
- Renewed: activated charcoal filter
Don't miss
- Operate hand vacuum pumpV.A.G 1390 several times. Vacuum must not build up.
- Operate hand vacuum pumpV.A.G 1390 several times. A vacuum must build up.
📋 Procedure
- Pull breather hose (1) (to solenoid valve) off breather line (2) (from activated charcoal filter).
- Connect vacuum testerV.A.G 1368 at connection (A) to breather line of activated charcoal filter using adapters V.A.G 1318/12, V.A.G 1318/13 and V.A.G 1318/17.
- Connect hand vacuum pumpV.A.G 1390 to connection (B).
- Set vacuum tester to position "“A/B”".
- Operate hand vacuum pumpV.A.G 1390 several times. Vacuum must not build up.
- Disconnect breather line (1) (to solenoid valve in engine compartment) on activated charcoal filter.
- Connect adapterV.A.G 1318/17 to line leading to solenoid valve and seal it.
- Operate hand vacuum pumpV.A.G 1390 several times. A vacuum must build up.
- Check breather lines and couplings for interruptions or separated couplings .
- Check breather line to wheel housing.
- Check pressure retention valve .
- Disconnect breather line (3) (to solenoid valve in engine compartment) on fuel filter.
- Operate hand vacuum pumpV.A.G 1390 several times. Vacuum must not build up.
- Check breather line for blockage.
- Reconnect breather line on fuel filter.
- Disconnect breather line (1) (to solenoid valve in engine compartment) on activated charcoal filter.
- Operate hand vacuum pumpV.A.G 1390 several times. Vacuum must not build up.
- Check breather line for blockage.
- Reconnect breather line (1) (to solenoid valve in engine compartment) on activated charcoal filter.
- Separate breather line (2) (to expansion tank in wheel housing) at activated charcoal filter.
- Connect adapterV.A.G 1318/17 to line from activated charcoal filter and seal it.
- Operate hand vacuum pumpV.A.G 1390 several times. Vacuum must not build up.
- Check breather (arrow) on activated charcoal filter (1) for damage or soiling.
- Renew activated charcoal filter.
Other VW procedures
- Checking fuel pump non-return valves – VW Touareg I
- Checking fuel pressure regulator and holding pressure – VW
- Checking oil pressure
- Removing and installing ignition coils with output stage · 1 torque figures
- Preparing cylinder head gasket for fitting cover · 2 torque figures
- 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.