Though an open-ended wrench can sometimes be used, it is often best to purchase or rent an oxygen sensor socket set. Replacing an oxygen sensor is typically a simple DIY task, and the sensor can often simply be unplugged and unscrewed from the sensor port in the exhaust pipe. If you notice these issues, but your Check Engine light test is inconclusive, further diagnosis or a professional service center may be necessary to make your repair. Increased emissions or a failed emissions test.Other symptoms of a failing oxygen sensor include: If you believe your O2 sensors may be causing your Check Engine light, visit your local O’Reilly Auto Parts for free Check Engine light testing. The most common sign of a failing or damaged oxygen sensor is the Check Engine light appearing on the dash if the engine computer detects high or low concentrations of unburned hydrocarbon or fuel in the exhaust, either ahead or behind the catalytic converter. Fuel ratio information from the oxygen sensors is interpreted by the computer to determine what adjustments are necessary for peak performance and efficiency. Most vehicles have at least two O2 sensors: one or more upstream sensors located ahead of the converter, and at least one downstream sensor found behind the converter. This helps ensure that your vehicle is running as efficiently as possible, and minimizes emissions of unburned fuel that could damage the catalytic converter. Oxygen sensors, often also called O2 sensors, lambda sensors, or air-fuel ratio sensors, measure the oxygen concentration in your exhaust, communicating this information to the engine control module (ECM) to adjust the fuel mixture.
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