3.2L Porsche O2 Sensor input circuit

When hacking BOSCH's DME, we can get some schematics on the net. After comparing them to my own 3.2L DME, I judged them to be quite reliable. The figure on the left is an extract of the input part of the O2 sensor from the circuit diagram.
 However, this was created with a different thought circuit than mine and is not easy to understand. So I rewrote the schematic in line with my thoughts. I have excluded the parts related to hysteresis and the pull-up resistor at the output.
There is a slight error in the calculated value, but it is a better choice than throwing everything out there without knowing.

  If I were to design an input circuit for an O2 sensor, I would prepare one comparator. But the BOSCH engineers prepared two comparators.
Each of the two comparators has a different threshold. The lower one is 0.44V and the higher one is 0.49V. If the input voltage is lower than 0.44V, the mixture is considered to be too lean. If the input voltage is higher than 0.49V, the mixture is considered to be too rich. What happens if the input voltage is higher than 0.44V and lower than 0.49V?
 The engineers at BOSCH offer a "do nothing" option for this input state. However, for an inexpensive O2 sensor, there is no intermediate voltage output.
So, is the "do nothing" option utilized in such a state? This is when the O2 sensor is removed and the DME input pin 24 is open. In this case, the input pins of the two comparators will have a voltage of 0.465V, which is the middle of the above threshold level, applied to them. And it will continue to do so, if there is no noise or other disturbance.