01650 error code

Hello all 

have had engine light come on and coil light sporadically flash on the dash on my Octavia VRS TDI CR 

plugged in a scanner and it’s coming up with 01650 cylinder 2 glow circuit active / static. 
 

clear the fault but it comes straight back again. 
 

any one have any ideas what needs to be done to fix ? Any advice would be greatly appreciated. 
 

sure it’s not as simple as a new set of glow plugs with the luck I have and be something mega money. 
 

the other fault codes cleared and didn’t come back so possible they are old codes 😊
 

many thanks 

Darren