Downstream O2 Sensor - What a PITA!!!

[LeiZ]

Hi Gents,

What option do I have now? after 1) old O2 sensor nut (22mm) is stripped, and 2) it still doesn't budge like it's been welded on the pipe.

I admit it was using 7/8", which stripped the nuts. But the O2 Sensor socket is genuine from Advance Auto Parts, nice quality built, and I've used it to take out the other downstream sensor, which was quite smooth. So I really don't know what else I can do at this moment, although I know it won't affect any driving performance.

Comments or advice is greatly appreciated. Thank you!