P0031 ho2 sensor code

[Sirspidey]

Hi all it’s been a while since I’ve had to post on here, but just wanted some advice.
So yesterday I had the dreaded CEL come on. Plugged in my reader today and I had the code p0031 ho2 Hester pow bank 1 come up. Had a quick look on internet and most say it’s the o2 sensor at fault, well kinda worked that out for myself. Now I just wanted an expert to confirm that my best cause of action is to replace the sensor or could it be something else??
The car runs fine, if anything maybe a slight hesitation when you blip the throttle and I have thought for a while the the car was ‘smelling’ of fuel.
Any thoughts please, before I order the part up.
Many thanks
Jeff

Edit also I’ll add I cleared the codes and started the car, cel disappeared for a moment then came straight back and had the same codes.
Thanks
 
 
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