Check Engine Light on Due to Failed Catalytic Converter on Mercedes-Benz C240

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

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Average mileage: 109,389 (47,000–140,000)
5 model years affected: 2001, 2002, 2003, 2004, more2005
13 people reported this problem
2 people shared problem details
Engine light on. Computer NO OPERATING PROBLEMS. Engine occasionally shakes or is rough in operation.
p0300, p 0306, p0305 dtc's Catalytic converter rattled under load
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My car when I drive it over 85 MPH the check Engine light comes up for Engine mis fire, why is that happening?
The engine may develop a stalling and/or no start condition due to a failed crankshaft position...
light had come on before, put higher octane gas, went off, changed plugs, went on long trip with lower octane gas with booster, now using nothing but 93 octane gas.

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