They make special sockets and wrenches to get the old O2 sensors out, but (if possible), I unhook the wires from the harness, cut the wires off of the old O2 sensor and put a close-ended wrench over it. I then use a torch to get the old O2 very hot. Usually, the old one then comes out even if you have to use a lot of persuasion. The last one I did on a '97 Ford F250 fought me the whole way, squeaking and complaining, but the female threads remained in good shape while the threads on the old O2 sensor looked terrible. Your good replacement O2 sensors already have the thread coating on them and if you use a name-brand replacement, hopefully you'll never have to worry about that one again.
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Today's Featured Article - Restoration Story: Fordson Major - by Anthony West. George bought his Fordson Major from a an implement sale about 18 years ago for £200.00 (UK). There is no known history regarding its origins or what service it had done, but the following work was undertaken alone to bring it up to show standard. From the engine number, it was found that this Major was produced late 1946. It was almost complete but had various parts that would definitely need replacing.
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