Hi, welcometomyturbodies
I think you might need to look at this faq assuming it's a pd engine. I'm not sure if it's the same but might have the info you need
http://www.myturbodiesel.com/1000q/multi/camshaft-inspection-replace-vw-tdi.htm
Or this one might be more relevent which is for the 2004-05 passat.
http://www.myturbodiesel.com/1000q/multi/PD-adjust-Idle-TDI.htm
I think you might need to look at this faq assuming it's a pd engine. I'm not sure if it's the same but might have the info you need
http://www.myturbodiesel.com/1000q/multi/camshaft-inspection-replace-vw-tdi.htm
Or this one might be more relevent which is for the 2004-05 passat.
http://www.myturbodiesel.com/1000q/multi/PD-adjust-Idle-TDI.htm