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The Oxygen Sensor in Dodge Ram 1500 vehicles is a vital part of exhaust emissions regulation since it measures the concentrations of unburned oxygen in the exhaust that are useful in maintaining the correct air-fuel mixture. It produces a voltage signal out of the oxygen level so that the engine control computer changes the fuel injector pulse width. It operates in a feedback "closed loop" system which increases the performances of the catalytic converter. It is quite common with Dodge Ram 1500 models to feature zirconium dioxide oxygen sensor, these can range from the narrow- band and the wide-band oxygen sensors. Narrow-band sensors give signals in terms of rich/lean and wide-band sensors gives signals with a wide range of air-fuel mixture. In the long-run, these sensors are affected by contamination hence emitting more fuel and reducing the efficiency of the engine. Oxygen Sensor as one of the crucial components in the Dodge Ram 1500 trucks need close monitoring and consistent maintenance for the machine to function efficiently.