The sensors in your Civic or Accord, like your Honda oxygen sensor, do exactly what their name suggests: They sense variables in the environment. In the case of your Honda oxygen sensor, it detects the amount of oxygen available in the exhaust gas. The Honda oxygen sensor relays this information back to the vehicle's computer so it can make adjustments as necessary to your fuel/air mixture. If it sounds simple, that's because it is. With the modern Honda oxygen sensor being as reliable and proven as it is, chances are you'll go tens of thousands of miles without any trouble. But your Honda O2 sensor will fail someday, just because of the corrosive environment in which it works. When you need a new Honda oxygen sensor, you have several options. But if you want to save money on your Honda oxygen sensor, you only have one option: Buy your new Honda oxygen sensor from us. The Honda oxygen sensor comes in several varieties, but we have them all here in stock and ready to ship. So just select the Honda model you need a Honda oxygen sensor for, and we'll make sure the right one gets to you.