1988 190E 2.3 - Cat Converter blown
My 1988 190E 2.3 failed it's emmissions test recently. It passed after replacing Airflow meter & Cat Converter. After 2 months, the new Cat converter blew (makes a rattling sound). I assume the inside has melted.
What would cause a Cat Converter to blow like this? Where should I start to look?
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190E 2.3, 1988
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