P0132 Help Needed

Nissan Micra k12 1.2 Petrol 2007 eml light on code P0132 O2 sensor Circuit high voltage bank 1 sensor 1 rough idle hesitation upon Acceleration reset Eml few miles later Eml back on with same symptoms,Changed front O2 sensor but Eml and symptoms back again after only a few miles,should I replace the back post cat sensor aswel or any suggestions scanner showing both sensors voltage stable at 1.275 volts with eml on please help
 
Update changed spark plugs and gave the car a full service but still same issue with EML coming back on after a few miles rough idle and hesitation on pick up with OBD2 on it reads sometimes both sensors 1.275v and sometimes both are within range under 1v and sometimes the post cat sensor is reading high 1.275 and the pre cat is within range under 1v fault code is still P0132 O2 sensor Circuit high voltage bank 1 sensor 1 looking online I keep seeing that its normally the No 2 sensor (downstream)that needs replacing even though the fault is showing sensor 1( upstream) Please some advise would e really appreciated Thanks
 
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