I'll tell with some words what I did:
LSU that I use is BOSCH...7057, IC - BOSCH CJ125 , I made a demo board with the connection exactly the same as in the CJ125 description. I use pic mcu to control the bosch ic . there are 2 analog values to measure , measuring RI is needed to control the heater.
Did U make any board with bosch IC ? , and did U succeded with measuring AFR. Aaa now I have available one working LSU controller - WBO2.
I think to compare it with mine on working car , but .....it's harder than I think to make it work properly.
The other thing that I can't understand is how to transformate the measured value /voltage 0-5V/ to AFR/ 8.0 - 18.0/