100,000 milesClick to see full answer. Consequently, how often does a catalytic converter need to be replaced?The catalytic converter, which converts harmful emissions into harmless gas, often lasts 10 years or longer and should be replaced only when needed. It can become clogged, physically damaged, or contaminated by oil or engine coolant.Likewise, how long does the average catalytic converter last? The truth is, on modern vehicles, the catalytic converter should last the life of the car or truck, given an “average” life of about 100,000 miles (160,934 kilometers). Also asked, what are the symptoms of a bad catalytic converter? Among the symptoms of a bad catalytic converter are: Sluggish engine performance. Reduced acceleration. Dark exhaust smoke. The smell of sulfur or rotten eggs from the exhaust. Excessive heat under the vehicle. What is the average cost to replace a catalytic converter?On average, expect to pay anywhere between $500 and $2,200 to replace a catalytic converter in newer cars. Parts alone will cost $400 to $2,000. Labor costs will set you back $75 to $150 for the estimated one hour of labor needed for replacement.