is 2000s40 and a 2001s40 volvo inerchangeable
Yes, those parts are all interchangeable as far as I know.
i was told there is diferent phases of volvo,s and years you have to get numbers of eng trans so forth ? i dont know
There are two generations of the S40, 2000-2004 and 2004.5-2012. Pretty much anything you need is interchangeable among first generation or "phase I" S40s/V40s.
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