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As stated above, if you had changed your O2, chances are your cat would have lasted longer...a slow/wonky O2 is Very hard on your cat.
The early MB O2 lights were crude @ best...are you sure the light even works???
All the catalytic converter manufactures want to see you changing O2's @ 30-40k. Also, if you install a new O2 and don't' install a new O2 your warranty is voided.
Jonathan
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