Work sequence

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, and 2003 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Plenum Chamber Cover & Removing Rubber Seal

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Remove rubber seal from plenum chamber cover in direction of - arrow -.
Pull plenum chamber cover - 1 - toward front and remove.

Fig 2: Unbolting Cover Of Electronics Box In Plenum Chamber

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Unbolt cover of electronics box in plenum chamber.
Start output Diagnostic Test Mode and actuate Secondary Air Injection (AIR) pump relay J299.

Fig 3: Location Of Secondary Air Injection (AIR) Pump Relay J299

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Secondary AIR pump relay - 2 - (in 3-way relay carrier of electronics box at left side of plenum chamber, position 2) must pick up and Secondary AIR pump motor V101 must run intermittently.

A - If relay does not pick up:

Check power supply of secondary AIR pump relay.
Check actuation of secondary AIR pump relay.

B - If relay picks up, but secondary AIR pump motor does not run:

Check power supply for secondary AIR pump motor.