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Check Engine Light on Due to Failed Catalytic Converter on Mercedes-Benz C320 4MATIC

Problem Description and Possible Solution

Catalytic converter failure is common and may cause a Check Engine Light to illuminate.

Problem Data
RepairPal Verified
Average mileage: 116,555 (111,111–122,000)
3 model years affected: 2003, 2004, 2005
5 people reported this problem
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Catalytic converter