The role of the Audi oxygen sensor in regulating fuel emissions is vital for better engine performance and fuel economy. It monitors exhaust gas and deposits developed by the engine, thus providing data about the air-fuel ratio. Whenever the ratio is below or above normal, the sensor relays information to the engine control system for precise fuel mixture adjustment. Fluctuating idle speed and a sudden decrease in gas mileage are some telltale symptoms of a bad oxygen sensor. Heated sensors should be changed after 100,000 miles, while unheated sensors after 50,000 miles.
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