If it’s a high pitched squeak, especially at low speeds I had the same problem. Mine was primarily on the left side, but also some on the right. There are many a post here about the front suspension on the S70 having problems, mainly with the brushings on the front controller arms and the engine mounting brushing.

For some reason these rubber parts squeak like hell. There is a kit the Volvo dealer will use to replace the brushings, especially the engine mount and controller arms.

JH