Work procedure

WARNING: This page is about a different car, the 2006 Audi A4, 2005 Audi A4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.

Switch ignition off.
Remove rubber seal for plenum chamber cover.
Remove plenum chamber cover -1- toward front (arrows).

Fig 1: Removing Plenum Chamber Cover

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Courtesy of AUDI OF AMERICA, INC.

Pry off both covers -3- using a screwdriver.
Loosen hex-nuts -4- by several turns.
Loosen wiper arm -2- from wiper axle by lightly tilting.
Remove hex nuts completely and remove wiper arms.
Disconnect securing clips -1- and remove cowl grill -5-.

Fig 2: Prying Off Covers, Removing Hex Nuts, Wiper Arms, Disconnecting Securing Clips & Removing Cowl Grill

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Courtesy of AUDI OF AMERICA, INC.

Remove cover for E-box, plenum chamber (arrows).

Fig 3: Removing Cover For E-Box, Plenum Chamber

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Courtesy of AUDI OF AMERICA, INC.

Using a screwdriver, pry off retaining bracket (arrows).

Fig 4: Prying Off Retaining Bracket

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Courtesy of AUDI OF AMERICA, INC.

Disengage connector catches (arrows) and disconnect harness connectors -1- and -2- from Engine Control Module (ECM).
NOTE: Adaptation values are erased when connector is disconnected from the Engine Control Module (ECM), DTC memory content remains intact.

Fig 5: Disconnecting Harness Connectors From Engine Control Module

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Courtesy of AUDI OF AMERICA, INC.

Connect e.g. VAG1598/31 test box to connectors of wiring harness. Connect Ground (GND) clip of test box (not visible in illustration) to Ground (GND). Relevant test procedures note whether Engine Control Module (ECM) should also be connected to the test box.
CAUTION: To avoid damaging electronic components, set measuring range before connecting test leads and observe all test requirements.

Fig 6: Connecting VAG1598/31 Test Box To Connectors Of Wiring Harness

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Courtesy of AUDI OF AMERICA, INC.