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Hard starting, loss of power, poor fuel mileage are symptoms of a clogged converter.
A Catalytic Converter can fail if it becomes clogged or poisoned but there is no way of knowing when it is clogged. Replace your Catalytic Converter when it starts to malfunction.
if we are talking about clogged catalytic converter; 1. Lost of power 2. Engine warm up fast 3. press gas pedal, but engine runs low RPM it depends on the % clogged
The answer is yes, it can.
No, if it is clogged it must be replaced.
Yes, it most certainly can if the converter is clogged.
It is not advisable.
Replace it
Yes it is possible.
They can become clogged or they can burn out.
Yes
Yes, you can do serious damage to the engine if the converter is clogged.