The Oxygen Sensor affects the Toyota Sequoia since it is important in monitoring the unburned oxygen levels within the engine exhaust in order to pass feedback to the engine control computer. This sensor produces a voltage signal in proportion to the richness or leanness of the mixture and thereby helps the computer alter the fuel injector timing in order to achieve optimum combustion efficiency and minimum emissions. The Toyota Sequoia production models use zirconium dioxide, oxygen sensors and may come with both an upstream and a downstream sensor. The upstream sensor is used for real time changes and the downstream sensor is used mainly to assess the working of the catalytic converter. Later designs could also have wide-band air/fuel ratio sensors which provide a wider spanning and more accurate information than the oxygen sensors. Both of them have issues of contamination and degradation with time, which may affect their performance and increase the rate of emissions if not well checked.
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