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 - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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