Went to Bosch who told me that these sensors are often faulty and give incorrect info re fuel mix causing your car to use more.....
Just filled up and my new usage is 7.7 l/100k !!! Exactly what the experts tell me it should be.
Now when the sensor was "working" my consumption was 9/8 ish and is now 7.7 with faulty sensor??
Bosch told me to leave it alone and maybe refit new one only if engine light comes on?
Your thoughts?