Oxygen Sensor

Put the PScan on my MGF - no error codes showing - but the Oxygen Sensor returns seem strange:
Oxygen sensor status = Okay
Oxygen sensor duty cycle = Invalid value
Oxygen sensor frequency = Invalid value
Oxygen sensor voltage = 0.15V

I have checked that there is electrical continuity between the 2 x white wires but not between any other pairs.

Wondering if the above indicates a failed sensor or moew likely a wiring/ECU fault?

a normally operating oxygen sensor will switch between about 0.2V and 0.9V.  A sensor that isn't connected normally results in the ECU showing (from memory) a constant 0.45V.
If your sensor is constantly at 0.15V (so pretty near 0.2V) it sounds like it's connected, but either the sensor is faulty, or the ECU is not capable of controlling the fuel quantity for some reason, which seems unlikely if it's actually running.
Also genuine MG Rover sensors were earthed differently to generic sensors so if someone has changed the sensor and fitted the wrong one then that can be a factor as well.

That bit on the earthing is interesting. A few years ago I did some work on O2 stoic values, I collect several different sensors from cars at my pet scrappy, finding problems with certain types, all Bosch devices were consistent, others were problematic. I would be happier using a used Bosch item than a new replacement.
As my car sailed through its MOT test yesterday morning, my choice was vindicated.
I bought three of the used Bosch units & returned the rest as “tested & good” the rest were chucked.
M