Oxygen sensors are a regular maintenance item, and should be replaced every 30,000 miles. If you have factory exhaust manifolds, then the single wire sensor is adequate.
A heated oxygen sensor will heat itself, allowing a more reliable sensor reading than a single wire sensor. Headers usually place the oxygen sensor further down the exhaust stream, where exhaust temperatures are cooler. If you have headers installed, it is a good idea to use a heated oxygen sensor (3 wire) instead of the usual single wire sensor. The sensor will not read properly until exhaust gas temperature reaches approximately 600 degrees Farenheit. Exhaust gas temperature will affect the oxygen sensor reading as well. Keep in mind however that oxygen sensors (except wideband oxygen sensors), are not very accurate below or above. This is normal, and an indication that the sensor is in working properly. Since the sensor is essentially just a switching device, it will be fluctuating alot between lean and rich. An ideal mixture (also known as a Stoichiometric mixture) of 14.7:1 is represented by. The signal sent to the ecm by the ecm varies between 0.0 and 1.0 volts. Depending on how much oxygen is in the exhaust, the ecm can determine whether or not the air/fuel mixture is rich or lean.
Oxygen Sensor: Responsible for determining the amount of oxygen in the exhaust manifold.
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