This research explores the use of hybrid waste rubber tyre-based polypropylene and coconut fibre composites for car door panel applications, aiming to balance noise absorption and mechanical strength. The composite was prepared using mixing and hot press-moulded machines, with coconut fibre content increasing tensile strength and elongation at break. The composite had the highest tensile strength of 5.25 MPa, but the tensile strength decreased with increasing coconut fibre content. Young's modulus increased by 62% but reduced elongation at break by 14.71%. The impendence tube test showed a higher sound transmission loss for this new composite compared to the current material.