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Hi there: There is a sensor located before a emission device called a catalytic
converter that is located on both sides. The sensors in the back of the
engine are called O2 sensor 1 bank one, (sensor before the catalytic
converter) and O2 sensor 2 bank one (located after the converter).
On the front of the engine, going down you have two as well for there is
a converter on both sides. first one coming from the engine is O2
sensor 1 bank 2 and then your failed one after the converter, O2 sensor 2
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I had exactly the same problem .Mine was corrected with replacing the O2 sensors .The sensors cost less than $30 each but cost about 20 mins labor per sensor .So if you got an honest mechanic the total cost will be around $130 .
There are only V6 endeavors in the US, are you certain you do not have a 3.8L V6?
Bank 1 refers to the side of the engine that contains cylinder number 1. This is the side of the engine nearest the firewall. Sensor 1 refers to the first sensor off the manifold, or closest to the engine. This also is the O2 sensor that is located before the catalytic converter in the manifold. Sensor 2 is located after the catalytic converter, further down below the car.