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First, do not work alone and put your vehicle in park, set the parking brake. Remove the negative battery cable. Get a floor jack and raise the driver's side of the car. Place jack stands under the car for safety. You can also leave the jack raised under the car for extra safety. Spray some lubricant (PB Blaster or WD40 or Liquid Wrench) on the Oxygen sensor where it screws into the catalytic converter. This will aid in the removal process. Unplug the wiring connector to the Oxygen sensor under the car. Get a 7/8" box end wrench and slip it over the cable to the O2 sensor and try to remove it by turning counter-clockwise. If it is still stuck, spray some more PB Blaster. If it is still stuck try using a small propane torch to heat up the area around the catalytic converter where the Oxygen sensor screws in. The heat should help loosen it up now. Unscrew the old O2 sensor and install the new unit. Be sure to check if the new O2 sensor has anti-seize compound on the threads already. If not, buy some at the auto parts store (nickle based anti-seize compound). Screw in your new O2 sensor and connect the wiring harness plug. Reconnect the battery cable. You may have a check engine light or other light for a short while. Just drive your car for about 30 miles to reset the engine computer, it should clear itself.
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