If you've fried your catalytic converter, but you're not sure why, we'll give you a big hint: Test your Nissan oxygen sensor. When you find out your Nissan oxygen sensor is faulty, order a new Nissan oxygen sensor from us. We're not magicians, and we're not mindreaders, but the Nissan oxygen sensor plays a large part in many catalytic converter failures. And since the converter isn't cheap, it will save you money in the long run if you ensure your Nissan oxygen sensor is working correctly when you install a new cat. So why would the friendly little Nissan oxygen sensor do something as devious as nuking your catalytic converter? Well, unfortunately the Nissan oxygen sensor has a tendency to get saturated by all the exhaust it sniffs. And when the Nissan O2 sensor goes loopy, the engine runs rich, just to be careful. All that extra gasoline, which goes unreported by your Nissan oxygen sensor, ends up your converter, and a meltdown is the end result. Pay attention to the lights on your dash and the smells in your exhaust, and you should catch a faulty Nissan oxygen sensor before it's too late. Just order your new Nissan oxygen sensor from us, screw it in, and you're on your way. If you didn't catch it in time...well, we have Nissan catalytic converters for sale too!