The Volvo S80 Oxygen Sensor constantly sends back reports on the remaining oxygen in the exhaust to enable the engine computer to adjust the mix of fuel and air to produce cleaner power and top mileage. It is a threaded steel housing containing a zirconium dioxide core coated with platinum, which heats to operating temperature in a few seconds by use of an inbuilt heater, and the control module can enter closed loop nearly the moment the unit is started. Its quick changes of voltage of around 0.1 to 0.9 volts keep the catalytic converter active, and late wideband models transmit even richer data via current feedback, which provides the sedan with better throttle response and low emissions. Drivers are confident in the long-term durability of the part due to a responsive Oxygen Sensor, which helps stop running rich, fuel wastage, and the irritating check engine light. All S80s since 1998 have at least two sensors, an upstream sensor to monitor live mixture control and a downstream sensor to monitor converter health, which is why this feature protects the performance and environmental compliance of base inline-five trims, torquey D5 diesels, and the powerful 4.4-liter V8 flagship. Feeding the sensor directly into the complex control network of the car indirectly provides support for signature Volvo safety technologies, which are based on the predictability of engine output, another layer of assurance behind the wheel. The Volvo Oxygen Sensor has a distinct advantage over its competitors; it has quick warm-up, plating that is long-lasting and resistant to lead and silicon contamination, and it lasts thousands of heat cycles in tests, which leaves the owner with confidence in the product even many winters later. Its clear thread fit and simple plug-in also make it easy to replace on both generations of the S80, reinforcing the reputation of the sedan for refined and reliable Volvo performance.
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