Maverick 2.3 150hp rattled about loose ceramic in exhaust system

Moin, my father’s Maverick has recently made rattling noises when starting up and at low speed. The Ford workshop in which the car was always maintained probably noticed loose ceramics in the exhaust system, more precisely I don’t know. A repair is expensive (>1000€?) and expensive because parts can not be ordered cheaply. Is it perhaps useful to visit a free workshop or simply continue driving? Thanks in advance