Removing the sensor is easy, except for disconnecting the electrical connector. The connector for both O2 sensors on either side is between the engine and the firewall, I have big arms and hands and it was a bear getting them up into that cramp area to disconnect the connectors. Perhaps smaller arms and hands it will be easier. I looked could not see any practical way of moving the complex wire harness around to get the connectors to a spot that has more access.
What I didn't try, cause I didn't think of it, might be to unbolt the connector twisting the wires around, you probably have enough length of wire to do it without damage, count the number of turns to remove the sensor. Pull the O2 sensor up past the spot between engine and firewall and hope the connector comes out in the engine bay with enough room to disconnect it. Reconnect the new O2 sensor, snake it down behind the engine to where it needs to go, then twist the sensor the number of turns it will take to bolt it down, to pre-twist the wire bundle enough that its straight after bolting the sensor in.
Oh, O2 sensors love to seize to the exhaust bung, I have broken wrenches trying to get them out. BUT, if you run the engine to get the exhaust hot, the heat will expand the bung and let the O2 sensor break free. Of course you can burn yourself on the hot exhaust, so after heating up the exhaust, just put a wrench on the sensor and break it free doing a half turn or more and then let the exhaust cool down before going to work.
And a final note, anti-seize and other chemicals will destroy the O2 sensor. I have had brand new O2 sensors go bad in a month, and sure enough when I pulled them, they were smeared with anti-seize. The threads will come coated in anti-seize with a cover on them to prevent it getting on the sensor. You have to be very careful installing the O2 sensors to make sure you don't get the anti-sieze on the sensor portion, nor do you get any chemicals on it, even greasy hands touching the sensor portion can damage the sensor. Wash your hands thoroughly before going to install the new sensor.
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