You repair a clogged catalytic converter by replacing it.
A catalytic converter works by having unburned gasoline or some other substance touch a metallic catalyst such as platinum or rhodium. When the catalytic metal becomes covered over with garbage it stops working. When it stops converting the garbage to carbon dioxide and water, the small holes in it then become clogged. Then it will not let exhaust gasses pass though.
No way exists to clean out a catalytic converter. They can only be taken apart and the substance used as raw material to create a new metallic catalyst.
You can drive fast and blow the dirt off!
No, there is no repair if it it clogged. Replace it.
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.
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.
Yes it is possible.
Replace it
They can become clogged or they can burn out.
Yes
Yes, you can do serious damage to the engine if the converter is clogged.
Loss of power, and a converter that gets red hot.