Please refer to Catalyst Temperature PIDs (mode 01 pids 3C, 3D, 3E, 3F) for the following questions - https://en.wikipedia.org/wiki/OBD-II_PIDs#Mode_01
Q1. Is there a thumb rule that the catalyst temperature at bank 1 will always be greater than or equal to bank 2 catalyst temperature?
Q2. What is the catalyst temperature range that can be considered normal for petrol and diesel cars? I googled it, but different websites had different ranges.