Now 2 months after fitting the cable and clamps I have error codes PO131 and PO132 (02 sensor high voltage and O2 sensor low voltage). On the diag tool the sensor 1 voltage jumps around from .15V to .85V and sensor 2 from 0 to .85V. (note the EML warning light was off at the time of those readings). I am assuming the cheap sensors or the cat fitted by the insurance company have failed? Looks like I will have to take off the clamps and cable! I suppose maybe the cable damaged the sensor wiring but I thought I was careful about that.
Your voltages sound normal for a warmed up cat, but it's only a rough test through OBD.
It's odd to get both P0131 and P0132, sounds more like an intermittent wiring issue than a sensor. Check that the pre-cat sensor connector is fully seated, or has not been heat damaged by touching the cable or clamps, etc. Any damage allowing water ingress may give those codes.
Do the codes reset and return, or are they permanent?