I know the best people to answer this is on this board.........

Running a NB O2 on LH side an a WBO2 on RH side and I get diffrent values from them. I have checked for leaks and have changed headgaskets 2times and completly rebuilt the engine with new block and a diffrent cam, same results... Swapped side on the injectors, swapped injector drivers between the sides ( I have 2 running 749 p/H mode) nothing helps so I thinks its the sensor fooling me.....

But if I stand at
idle and activate BLM ist going down to 104 and WB= 15.5
Idle with BLM locked WB is 14.7

Have checked this with swapped drivers between the sida, results the same...

And if I drive say 50mph BLM locked
AFR= 14.7 and O2mV 20-100mV and I get a code 44..........

Why is WB AFR 14.7 at idle rich according to NBO2( BLM 104) and when I drive WB AFR 14.7 is very lean?

Its a heated AFS-74 sensor, not too old either........