Bosch 4.9 LTCD

Hi all
Just to check...Can I take it that if one of my two Bosch sensors is reading a lambda of 10.0 that it needs replacement?
The other reads about 1.28 in free air. The reading follow the sensors are switched.
Just to check...Can I take it that if one of my two Bosch sensors is reading a lambda of 10.0 that it needs replacement?
The other reads about 1.28 in free air. The reading follow the sensors are switched.