I had bosch sensors in there right before i swapped in the new ones from British Atlantic. They did the exact same thing. They were throwing the same codes. The dude at AB said the sensors have worked good in other vehicles. They have not had any problems with them. They looked exactly like the stock ones I originally replaced.
i heard both plugs snap in and connect. the connections are clean at the plugs.
I replaced the original O2 sensors, they were not throwing any fault codes, but had 127K miles on them. I put new injectors and O2 sensors in at the same time.
I can see on my Torque app, the voltages are changing between .1 and .8 Volts.
I do not have CATS, but they have been gone for over 30K miles and I have never seen any codes thrown before.