Malfunction indicator or rattling noise heard originating from engine compartment or from under vehicle may indicate reduced catalytic converter efficiency – a basis for failing the state’s smog check program resulting in re-registration denial. MB has extended the emissions warranty from 8 years / 80,000 miles to 10 years / unlimited mileage for MY04 SL600 (230), and MY01-04 CL600 (215) & S600 (220). If for some reason you have not yet received a notification letter, PM your email address and I will forward documentation.