Manufacturer Part Number: 31489493AA. Volvo V40 Mk3 16-19 Facelift Stereo Amplifier. Vehicle/Model: Volvo V40 Mk3 16-19 Facelift. We would also require engineers/diagnosis reports with the issues noted and a clear photograph of our engine/gearbox fitted in the vehicle with our markings still on the engine/gearbox.