Replacing an o2 sensor?

[RagZmAn]

Is this a complicated procedure?
Would any one be able to give me an idea of what is involved and required?

Thanks

...
will update later my other thread about the eobd issue.

[Nickj]

If it's the same as car engines I've had then it's swap out the parts (then retune the ignition map to match the new bit if you find it's not running as well as it was). Depends the tolerances of the part your replacing.