Toyota Oxygen Sensors

Written by Jeremy Horelick
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Toyota oxygen sensors are included in all models manufactured in recent years as well as many from the '80s and '90s. Their goal is to help you reduce your emissions and improve your fuel efficiency by regulating the amount of air allowed to enter your Toyota's engine. Blends with 14.7 parts air to one part fuel are widely said to be "perfect," even though this standard can change.

Too much oxygen intake can result in nitrogen-oxide emissions that are not only harmful to the environment, but potentially detrimental to your Toyota. Conversely, too much fuel in the mixture is also ecologically threatening, as it often remains unburned and can end up in the atmosphere and, by extension, our ground water. Perfect mixtures, however, burn in equal parts and pose no real threat to the environment--hence the importance of a sound and reliable oxygen sensor.

The Specifics of Toyota Oxygen Sensors

Oxygen sensors are a wonder of modern engineering and design. Their role is to gauge just how much fuel is present in the mixture relative to air, then emit a signal whose voltage can be measured by the car's internal computer. A high reading (roughly a volt) indicates a rich mixture, while a low rating (.1 or .2 volts) signals a lean one.

Once your Toyota car or truck recognizes the abundance or dearth of oxygen, it lets the intake manifold know that less or more air is necessary. Whichever way the mixture tilts is a factor in the sensor's subsequent reading, which may reverse the first command until that perfect balance is once again struck. Hence, the oxygen sensor is always on the prowl for surpluses and deficiencies and constantly correcting for both.


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