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Thanks for the reply, but I got bored after work before your suggestion and went ahead and swapped the connections on top of fuel rail for bank 1 and 2 pre cat sensors. Started the car and checked the AFR using the Cobb AP. The problem followed the faulty sensor. So bank 2 sensor 1 is definitely bad.
Just ordered the bosch 17098 replacement since it's much cheaper than the 17102 that is used for bank 2. It looks like the only difference is that the 17098 is 200mm longer than the one I need to replace.
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