The MEMS 1.9 ecm, does not control the heater circuit directly, it operates a relay in the Engine Management Relay Module, which is the black unit attached to the ECM bracket, behind the ECM. The heater circuit of the lambda or sensor heated oxygen (HO2S) is supplied voltage from the relay via a blue with red trace wire to the sensor plug and earthed via a black wire to a body Earth point.
The relay is switched by earthing the relay coil via a black with green trace. The relay live feed is from the engine control relay also situated in Engine Management Relay Module on a brown wire fed from fuse 2 in the under bonnet fuse box.
Check for voltage on the blue and red wire, with a multi meter, should be 12v.
I was getting the same static readings 0.44 v, sensor not ok, tried three different sensors.
The other two wires on the sensor are the signal wires from the sensor to the ECM, light green and grey (slate) and grey (slate), although I think that you would require the use of an oscilloscope to read the output on these.
Even swapped ECM s but no difference.
I gave up in the end and converted my F to MEMS 3, as I had already fitted 135 cams, alloy manifold and blue injectors.
I hope this helps.
If someone works out what the actual problem is I would be interested to know !