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.

NOTE:

The Wastegate bypass regulator valve N75 and its wiring are monitored by the engine control module.

Read DTC memory of engine control module.

If display shows a DTC relating to Wastegate bypass regulator valve N75 :

Disconnect hoses from valve; leave connector connected.

Fig 1: Connecting Test Hose To Valve Connection

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Connect test hose to valve connection marked with - arrow -.
Start Output Diagnostic Test Mode and actuate Wastegate bypass regulator valve N75.

Indicated on display

Output Diagnostic Test Mode →
Wastegate bypass regulator valve -N75

Valve must click...
..and must open and close (can be checked by blowing into test hose).

If valve does not click:

Check internal resistance of valve.

If valve does not open or close properly:

Replace Wastegate bypass regulator valve N75.