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A catalytic converter can be ruined by a engine that is missing and dumping raw fuel into the converter.
A catalytic converter may last the life of the car. There is no set time to replace it.
80k miles
A bad catalytic converter and stopped up muffler will slow down the car. The catalytic converter is under warranty up to 84,000 miles, if defective. If you ran over a speed bump and damaged it, you have to replace it. You can buy a lower catalytic converter for $120 from advance auto parts.
Converter warranties seem to be 8 years or 80,000 miles.
They are built to last the life of the vehicle if the vehicle/engine is maintained properly. What destroys a catalytic converter is an engine that is not running right and is ignored.
If the car has high miles, try checking the catalytic converter. If it is clogged it will cause the vehicle to lose power.
8 years or 80,000 miles.
bad torque converter .
Normally 8 years, 80,000 miles.
8 years or 80,000 miles.
8 years or 80,000 miles whichever comes first.