9 people reported this problem
Check Engine Light on Due to Failed Catalytic Converter on Mercedes-Benz C240 4MATIC
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Catalytic converter went out at 22000 miles. Sounded like BBs rolling around under the car.
2005 Mercedes-Benz C240 4MATIC 54,000 mi, Visitor
Check Engine Light
2003 Mercedes-Benz C240 4MATIC 61,000 mi, Visitor
just fixed it and luckily it is still within warranty.