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The 2003 Ford Taurus has just 2 o2 sensors placed on it. One is situated before the catalytic converter, and the other is after. In previous versions, there were 3 sensors but for this year, they reduced to 2. If you need to swap out one, a new sensor will cost anywhere from $15 to $25. If you require a set for your vehicle, it will be between $30 and $40. If you want a professional to handle the sensor replacement, expect to pay around $200 per sensor.
There are typically two oxygen sensors in modern cars - one located before the catalytic converter and one after it. Nowadays, the majority of cars come equipped with four oxygen sensors.
Wow, pretty soon we'll have a party of 8, haha! 😂