E77 LY7 CL Fault

hi all
i have brought brand new o2 sensors because i thought my o2,s were no good.

i have tested both rear o2 and yes i know they only do the cats but the issue is as soon as i get a p141 error code, that's a rear o2 heater issue i then get a CL Fault and the car starts to run sluggish

im have tested both rear heater resistance and its 0.8ohms when cold.

rear o2 heaters work for about 10m and then the computer gets the code

cats temp go upto 800C

tune and log attached