One of the key parts of your emissions control system is the oxygen sensor.  If your Hyundai was built after 1980, you've got an oxygen sensor in it.  The oxygen sensor is an intricate part of your emissions control system.  Your Hyundai oxygen sensor is a sensor that transmits important information to the engine management computer.  It helps to keep your emissions low and you engine running efficiently.  In every vehicle, there is a ratio of air and fuel that is perfect for the running of your engine.  The oxygen sensor helps your vehicle maintain this balance by sending data to the engine management computer.  Oxygen sensors can tell if there is too much oxygen (a lean mixture) or too little oxygen (a rich mixture).  Once the information reaches the engine's computer, it can adjust the fuel level so that the ratio has regained its balance.  You can find your next oxygen sensor by searching our online catalog.