Change camshaft adjustment wheel yourself What is required?

Hello, we just got a V40 Bj 07 / 2000 offered with which the camshaft adjustment wheel makes noise. My husband is a car mechanic at Opel and could even borrow special tools from a motor repairer here in town but we don’t know exactly what we need to replace. Timing belts is clear but Volvo confused me a bit on the phone yesterday. There they told me that the following parts had to be renewed: camshaft adjustment wheel & camshaft adjuster, a rather expensive senso and of course the timing belt. Who can bring some light into the dark here and possibly know the prices of the spare parts? Lg Nathalie