Your vehicle has 4 o2 sensors.One on each bank and one in front of the converter and one behind the converter.If you have dual converters then there will be one in front of the converter and one in the rear.The ones on the drivers side are the left bank and the ones on the right are the right bank.Hope this helps.Good luck.
4 one on each side of the y pipe one in the y pipe in front of the catayltic convertor and one behind the cat
2 in front and 2 in rear of cadilic conerter
No3 in front of the cat bank sensor 1 one side of the Y pipe bank 2 sensor 1 the other side of the Y pipe the closest one of these two to the front of the truck is bank 1 senser 1. Then you have bank 1 sensor 2 witch is in the Ypipe in front of the cat . Then you have bank 1 sensor3 witch is in the pipe that comes from the back of the cat after the exhust gas has passed through the cat but before the muffler this is the final test of the exhust before it goes out the tail pipe
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