Checking charge air system for leaks: Audi A4 B9 (AXB, AXC, AXD, AXE, …)

🧭 Before you start

Fits: Audi A4 B9 (8W, 2015–)

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• Disregard (item 1).
• Risk of damage to flexible joints in front silencer.Do NOT bend the flexible joints in the front silencer more than 10°. — Lower front silencer (2) slightly and secure it with a cable tie (1), as shown.
• Make sure knob is pulled out before turning pressure control valve (2).
• If there is water in sight glass, remove drain plug (6) and drain water.
• Risk of damage if pressure is set too high.The pressure must not exceed 0.5 bar. — Adjust pressure to 0.5 bar via pressure control valve (2).

🔧 Engine codes this applies to

📋 Procedure

1. Remove engine cover panel Servicing 4-cylinder engine, 2.0 ltr. 4-valve TFSI10Engine cover panel; Removing and installing engine cover panel.
2. Remove lock carrier cover General body repairs, exterior63Bumper (front); Removing and installing attachments.
3. Remove bolts (arrows) and detach air guide (2). [Note: Disregard (item 1).]
4. Loosen hose clips (arrows).
5. Disconnect vacuum hose (2) and remove air pipe (1).

6. Fit end sealV.A.G 1687/6 and adapterV.A.G 1687/13-2 on turbocharger.
7. Loosen clamp (front) (arrows) and push towards rear.
8. ⚠ Risk of damage to flexible joints in front silencer.Do NOT bend the flexible joints in the front silencer more than 10°. — Lower front silencer (2) slightly and secure it with a cable tie (1), as shown.
9. Seal off front silencer with adapterV.A.G 1687/3 and adapterV.A.G 1687/15.
10. Depending on hose diameter, insert adapter1687/10, 1687/11 or 1687/12 into air hose (1) and secure with hose clip.
11. Connect charge air system testerV.A.G 1687 as shown on illustration.
12. Unscrew pressure control valve (2) completely and close valves (3) and (4). [Note: Make sure knob is pulled out before turning pressure control valve (2).]
13. Using a commercially available connection piece, connect charge air system testerV.A.G 1687 to compressed air (1). [Note: If there is water in sight glass, remove drain plug (6) and drain water.]
14. Open valve (3).
15. ⚠ Risk of damage if pressure is set too high.The pressure must not exceed 0.5 bar. — Adjust pressure to 0.5 bar via pressure control valve (2).
16. Open valve (4) and wait until test system is pressurised. If necessary, adjust pressure to 0.5 bar again.
17. Check charge air system for audible leaks or leaks that can be felt with the hand; apply commercially available leak detecting spray or use ultrasonic testerV.A.G 1842. [Note: A small amount of air escapes through the valves and enters the engine. Therefore it is not possible to perform a pressure retention test.Operation of ultrasonic testerV.A.G 1842Operating instructions.Release pressure in test circuit by detaching coupling from adapter before removing adapter.Secure all hose connections with correct type of hose clips (as original equipment) Electronic parts catalogue.]
18. Install lock carrier cover General body repairs, exterior63Bumper (front); Removing and installing attachments.
19. Install engine cover panel Servicing 4-cylinder engine, 2.0 ltr. 4-valve TFSI10Engine cover panel; Removing and installing engine cover panel.

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