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Oxygen Sensor There are actually (4) O2 sensors on your truck. If you look inside the wheel wells behind the fender liner, right about where the frame is one O2 sensor, the other is underneath the truck about half way back in relation to the transmission. If you see where the exhaust joints together, you went about 6" too far.
When you start looking at the O2 sensors, they are normally numbered something like "Bank 1 Sensor 1" Bank 1 is on the passenger side; Bank 2 is on the driver's side. Sensor 1 is the upstream sensor (near the frame, between the block and the cat) and Sensor 2 is near the Y-pipe (downstream of the cat).
Normally it is the upstream sensors (sensor 1) that go first. They see the harshest conditions. You will need; Oxygen Sensor Socket Anti-Seized Penetrating Oil Sometimes it will take 15 minutes or take a few hours it depends on your luck�
If you are replacing an old O2 sensor with a new one you don't need a special socket. A 7/8" combination wrench will do just fine. Simply unplug the bad sensor from the vehicle harness and cut off the wires at the old sensor. Then slip the 7/8" box end of the combination wrench over the sensor and turn the sensor CCW to unthread it from the exhaust. The new sensor will have anti-seize applied to the threads right out of the box. Use the open end of the combination wrench to turn the new sensor in. Tighten as you would a spark plug. No need to over tighten.
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