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Oxygen Sensor is one of the relevant and significant components in the Toyota Avalon vehicles used for the measurement of the air/fuel mixture in the engine exhaust for better performance and less emission. They instantly detect the left-over optimum unburned oxygen and proportionally compare that to the atmospheric level in order to create a voltage signal which in turn directs the engine control computer towards the right adjustment as a mixture. The ideal Avalon models have two oxygen sensors; the first one is before the catalytic converter, while the second one is after it. These sensors work at high temperatures and may oxidize or contaminate themselves, thereby making the engine emit large amounts of gases and burning fuel wastefully. They may include air/fuel ratio sensors which are newer in some Avalon vehicles, giving a broader range of measurements to get better readings. This paper will discuss and analyze the requirement of having properly functioning oxygen sensors and the regular maintenance needed for the Toyota Avalon.