The role of the Mercedes-Benz oxygen sensor in regulating fuel emissions is very important 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 this ratio goes below or above normal values, the sensor relays information to the vehicle's engine control system for precise adjustment of the fuel mixture. 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 should be changed after 50,000 miles.
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