It mounts in the rear manifold at back of motor just after the 3 cylinders piping converges into the single outlet - there will be a silver cover on it and a wire (usually black that comes to a connector about 6 " away. You can use a wrench (about 1" size) or a specific tool to remove it. Do this with engine cold or the threads will risk being damaged. The new sensor comes with special beaded lubricant for thethreads on the O2 sensor. Be sure to use it BUT be careful not to get any on the sensor itself. The job can be bit aggravating but not too terribly difficult.
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