The upstream 02 sensor is usually located shortly after the exhaust manifold, before the converter. That is the one that controls how the car runs. The downstream sensor, after the converter tells the computer if the converter is doing it's job or not. It does not affect performance, but you might have to live with a check engine light being on. There are probably 2 of each on a V6.
you have 2 O2 sensors, an upstream O2 sensors located in front of the catalytic converter and the downstream is behind it either on the exaust manifold or the exaust manifold pipe
There are 2 oxygen sensors on a 2004 Ford Taurus. The oxygen sensors check for the amount of going into the converter.?æ
The 1992 Ford Taurus has two oxygen (O2) sensors. Both O2 sensors are located upstream of the catalytic converter with one on each exhaust bank.
Taurus the bull is located in Alpha Tauri, Aldebaran
You need to change the downstream sensor that is after the Catalytic Converter
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That code indicates a fault in the 'downstream heated O2 sensor' , bank 2.That code indicates a fault in the 'downstream heated O2 sensor' , bank 2.
Trouble code P0411 means: Secondary Air Injection Incorrect Upstream Flow Detected
the sensors are located on the upstream and down stream of the exhaust system..one under the car behind the catalytic converter and one just in front at the top of the exhaust system comming out of the engine block.