P0056 Error code

Hi Guys

Need some help and advise.
My Sport Supercharged recently come up with an error code P0056. I have spoken with a mechanic and he said it might not be the O2 sensor it could be something else. I would like to know if this is common? What else can cause this problem? And if i continue to drive with this error code will it cause any further damage to the engine etc?
Thanks

@Slammer try posting in this section just click on the link.

https://www.landyzone.co.uk/forum/range-rover.10/

@brianp38dse thanks