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Todel's post in Fault code P0045 Audi A4 B9 2.0TDI Please help was marked as the answerUpdate:
I have replaced the boost pressure valve from the same Audi A4 B9 2.0 TDI. I have done a test drive for about ah hour and the fault has not appeared yet which leads me to believe that the issue has been fixed.
Thank you to all that helped.