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I have an engine management light on in this 2007 1.4 Note

The fault code reader says P0031 A/F SEN1 HTR (B1)|H02S1 HTR (B1)

I have checked the fuse behind the headlight a rather poor design of fuse box, but the 02 sensor fuse is intact, replaced the pre cat 02 sensor although the old one seemed to be ok when tested with a multimeter. Still the fault remains.

Does anyone have an ECU pinout diagram to check the the continuity of the wires back to the ecu incase there is a wiring issue? Any other reasons why this code might remain. Im assuming sensor B1 is the pre cat 02 sensor as any other internet search points to it.
 

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Have you checked the wiring to the sensor for fraying or loose connections ?
Did you clear the error after replacing the sensor ?
Also did you check the voltage to the sensor, it should be the same as the voltage of the battery.
The sensor has a heater incorporated in it, is this element getting power ?
I've also heard that one O2 sensor malfunction can manifest as an error in the second one and vice versa, if above checks are ok maybe consider changing the other sensor.
 
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