The 2004 Ford Taurus' O2 sensors ought to be tracked down close to the firewall before the exhaust system and close to the radiator after the feline. From under the vehicle find the exhaust down pipes that ultimately "y" into one gathering. The Taurus' O2 sensors are situated on the downpipes which each are introduced with exhaust systems. The sensors structure a significant connection in a vehicle's discharge and start frameworks by checking how much unburnt oxygen leaving the exhaust pipes. While working,they help to keep up with ideal efficiency and terminating. At the point when a sensor begins to fall flat or become d***y,readings will be compromised,making the vehicle run as well "rich" or as well "lean" and can bring about unpleasant standing by,diminished gas mileage and mIS Fires.