90000 service

You can buy good 49 state legal, not California legal, Catalytic Converters from a company called World Pac that will not re-set your Check Engine Light. Most Muffler shops will install a 'universal' catalytic converter that may re-set your check engine light. Mercedes has really demanding specs for their converters. Use our estimator link and select Service B which is a major service that is done every 30,00 miles https://repairpal.com/estimator/mercedes-benz/cl600