Checking activated charcoal filter system breather: VW Touareg I 6.0 (BJN)

🧭 Before you start

Disconnect the white breather line, remove the rear right wheel housing liner and the charcoal filter, and separate the breather line in the wheel housing. Connect the vacuum tester in the A/B position and the hand vacuum pump, then plug the line, union and hose in turn and pump several times, noting whether vacuum builds. Clear blockages, renew a kinked or blocked line or filter as the results dictate, and finish by checking the pressure retention valve.

Fits: VW Touareg I (7L, 2002–2010)

• Renewed: if blocked or kinked, activated charcoal filter

Don't miss

• Set the vacuum tester to the A/B position and leave it there for the second series of checks.
• Open path: vacuum must not build. Sealed path: vacuum must build. A wrong result points to the fault.
• Renew the breather line if it is blocked or kinked rather than clearing it.
• Renew the charcoal filter if the test shows it blocked, then check the pressure retention valve.

Written for this job from the workshop steps below · TorqFix editorial.

🔧 Engine codes this applies to

📋 Procedure

1. Disconnect white breather line (arrow) in engine compartment.
2. Remove rear right wheel housing liner: General body repairs, exterior66Removing and installing wheel housing liner.
3. Remove activated charcoal filter.
4. Separate breather line (1) (to activated charcoal filter) in wheel housing.
5. Set vacuum testerV.A.G 1368 to -A/B- position.

6. Connect vacuum testerV.A.G 1368 connection (A) to breather line (1).
7. Connect hand vacuum pump with accessoriesV.A.G 1390 to connection (B).
8. Operate hand vacuum pump with accessoriesV.A.G 1390 several times. Vacuum must not build up.
9. Check breather line for obstruction and renew if blocked or kinked.
10. Seal white breather line to activated charcoal filter (arrow) with a plug from engine bung setVAS 6122.
11. Operate hand vacuum pump with accessoriesV.A.G 1390 several times. A vacuum must build up.
12. Check breather line to wheel housing for interruption.
13. Connect vacuum testerV.A.G 1368 connection (A) to breather line (1).
14. Connect hand vacuum pump with accessoriesV.A.G 1390 to connection (B).
15. Leave vacuum testerV.A.G 1368 in -A/B- position.
16. Seal union (2) with suitable plug from engine bung setVAS 6122.
17. Operate hand vacuum pump with accessoriesV.A.G 1390 several times. Vacuum must not build up.
18. Now, seal hose (3) with suitable plug from engine bung setVAS 6122, and open union (2).
19. Operate hand vacuum pumpV.A.G 1390 several times. Vacuum must not build up.
20. Rectify blockage in corresponding connections and renew activated charcoal filter if blocked.
21. Now, seal union -2- and hose (3) with suitable plug from engine bung setVAS 6122.
22. Operate hand vacuum pumpV.A.G 1390 several times. A vacuum must build up.
23. Renew activated charcoal filter.
24. Check pressure retention valve .

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