Usually, labor is $70+/hour, and once you are in they charge at least an hour, that's why I said is cheap. And those O2 sensor wires are kind of special, not easy to solder.
BTW: When I can, I help. If you didn't get the answers for your questions doesn't mean you can insult people.
This is a technical BMW forum. Let's keep it this way.
JOY = BMW