Any way to make a catalytic converter last longer?
Yes there are ways to make a catalytic last longer, and they are simply keep running unleaded fuel, do proper oil changes, fix check engine light problems in a timely manner, avoid immersion and striking them when hot, and your cats should live roughly the life of your car. Unfortunately Yes, you will have to purchase a new one, and this is why; catalytic converters since the early 90’s are a design that looks like a honeycomb, which only allows exhaust flow one way, called a monolith style. When those start making a rattling noise, that means that noisy catalyst has seporated or broken from it’s mounting points, and is a matter of time until it will physically turn sideways inside the housing and have the effect of a potato in the tailpipe on that perticular side (if it’s a dual exhaust), and will most likely occur before your next test. It also means that the efficiency of that cat is highly reduced, which would explain part of the reason why your car had a harder time passing emissi
