I appreciate your reply.
I was not aware of the significance of the SCN code. Let me ask you a few questions then.
Some time ago, the NOx sensor on bank 1 failed. A local repair shop had it almost brand new when I discovered it. He probably just fixed the mistakes. The bank 2 NOx sensor was defective again after 500 miles, according to the error message. Using the same independent garage, I purchased a secondhand NOx sensor on eBay (it's possible the mechanic doesn't have star or didn't disclose it), and I had it replaced. At the 500-mile mark, I was met with the identical issue at bank 2. Today, a buddy and I planned to swap out our NOx sensors, but we discovered that the torque wrench wouldn't fit, necessitating the use of an offset lamda socket. But if it requires programming, then I could make the same mistake again if I switch out the sensor. Do you know how much a dealer would charge to put the software in for you?