O2 sensors & Ecutek
 

I'm in the process of getting my white car going again whilst I finish sorting out the black one and I'm about to put the Ecutek back in after having removed the Haltech that was in it. During the Haltech install extractors were installed and so the factory O2 sensors were removed and a Bosch wideband O2 sensor was installed for the Haltech to use for self-tuning etc but was disconnected when the Haltech came out.

Will the Ecutek mind not having any of the factory narrow-band O2 sensors installed? I still have the wideband sensor installed but it's nowhere near where the factory ones would have been located.

wiring is different to start with for the wideband sensor compared to the OEM narrow band sensor

You'll need the OEM sensor back to run the ECU