Screwed into the exhaust downpipe of your Legend or Integra sits one of the most important parts of your fuel injection system: The Acura oxygen sensor. Without the Acura oxygen sensor, your engine has no idea how well it's running. What do we mean? The Acura O2 sensor is a feedback device, since it measures the exhaust gasses and reports back to the computer. The computer is trying to maintain a specific air/fuel ratio in the engine, and the Acura oxygen sensor tells it how well it's doing its job. Sounds simple enough, right? Well, it's not a hard job, but the Acura oxygen sensor has to work in some pretty harsh conditions. After all, exhaust isn't the most pleasant thing to be stuck in, and the Acura oxygen sensor is right there with its probe in the heat of it all. So it's no wonder that Acura oxygen sensor failure, while not common, isn't rare either. And that's why we can supply you with a new Acura oxygen sensor at a reasonable price. Beware of shops that try to charge you several hundred dollars to replace your Acura oxygen sensor. An Acura oxygen sensor doesn't usually cost that much, and the labor to install it isn't terribly difficult. So buy your new Acura oxygen sensor here and save yourself a ton of green.