The oxygen sensors are a 4 wire sensor located by the catalyst under your car. If you follow your exhaust manifold down to the exhaust pipe you will see the sensor sticking right out of the exhaust. If your code reads bank 1 sensor 1 its the sensor before the catalyst and bank 1 sensor 2 is after the catalyst.
Fig. HO2S1 location "2" on 3.8L
Fig. HO2S2 location "4" on 3.8L
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