So you replaced a bad oxygen sensor on your Mitsubishi recently, but your vehicle still seems to be running poorly. It could be that your bad sensor caused a failure in your Mitsubishi catalytic converter. When an oxygen sensor goes bad, it causes your fuel system to dump additional gasoline into the cylinders. When the engine can't burn the excess gas, it ends up in the Mitsubishi catalytic converter where it begins to burn. The Mitsubishi catalytic converter heats up to extraordinary temperatures, and the ceramics inside the Mitsubishi catalytic converter break down. How much damage you've done to your Mitsubishi catalytic converter depends on how long you drove with a bad oxygen sensor. But in most cases, when a Mitsubishi catalytic converter sustains damage, it has to be replaced. That doesn't mean you're out a thousand bucks, though: You can buy a premium-quality, fully-DOT legal Mitsubishi catalytic converter right here and get your car running right again. Every Mitsubishi catalytic converter we sell is engineered for the correct flow and with all the proper hangers and brackets you need for easy installation. Don't believe a muffler shop or dealership that says you have to use their Mitsubishi catalytic converter. It's simply not true. You can save money and get the right Mitsubishi catalytic converter right here with the click of a mouse.