O2 sensor scanner question

Question by ronycough posted 7 months 3 weeks ago in Mercedes-Benz

On my MBII scanner when I run the o2 sensor test for bank 1 sensor 1 and bank 2 sensor 1, it says the vehical does not support. I'm new to mercedes, but I thought it has 4 sensors. 2008 S550. I'd appreciate any insights.