Checking combination valves for secondary air system for proper operation and leakage - country-specific version 1 — AUDI

🧭 Before you start

Fits: Audi A5 (8T, 2007–2016), Audi A5 Cabriolet (8F), Audi A4 B8 (8K, 2007–2015)

Don't miss

• Disregard (item 1).
• Blow lightly into test hose with your mouth (do not use compressed air).
• Blow more firmly (i.e. with greater pressure) into test hose with your mouth (do not use compressed air).

🔧 Engine codes this applies to

📋 Procedure

1. Remove plenum chamber partition panel General body repairs, exterior50Bulkhead; Exploded view - bulkhead.
2. Move fuel line (1) and line (2) (leading to activated charcoal filter) clear at air pipe.
3. Disconnect vacuum hose (3) from connection on air pipe.
4. Remove air pipe. To do so, release hose clip (4) and clamps (arrows).
5. Remove bolts (2) and press secondary air hoses to side. [Note: Disregard (item 1).]

6. Connect suitable hose (arrow) to combination valve for secondary air, as shown in illustration.
7. Blow lightly into test hose with your mouth (do not use compressed air).
8. Blow more firmly (i.e. with greater pressure) into test hose with your mouth (do not use compressed air).
9. Renew combination valve for secondary air system if you cannot determine the switching point: (left-side) , (right-side) [Note: Hose connections and air pipes and hoses must be free of oil and grease before assembly.Secure all hose connections with the correct type of hose clips (same as original equipment) Electronic parts catalogue.To ensure that the air hoses can be properly secured at their connections, spray rust remover onto the worm thread of used hose clips before installing.]
10. Install plenum chamber partition panel General body repairs, exterior50Bulkhead; Exploded view - bulkhead.

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