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Ok, I ordered a new sensor in the view of at least attempting to replace it myself. Still need to find a 22mm O2 sensor socket (any recommendations?). Does anyone know what is that black branching hose right on top of the downstream sensor in the attached photo? Would be good to get it out of the way...
That hose shouldn't be crimping the sensor lead like that.
For future reference, if you do not care about cutting the wire to the bad sensor (just be sure the sensor IS the actual problem, lol), then all you need is a ¾ inch breaker bar, an extension pipe for leverage, and a 22mm long socket, preferably an impact socket. It WILL break loose. Remember, those sensors are subjected to high heat constantly, so they expand and contract. They will be on tight and firm, but never seized. Oh, and the breaker bar has to be a good one with strong pivoting head.