The car was bought without papers so I had no idea when they were replaced. My car hasn't given me any problems or codes, but as a preventative maintenance I decided to replace them. It was pretty easy, but it took a long time. The reason for this is that I used a crow's foot (22mm) instead of an O2 sensor socket. If you decide to buy an O2 sensor socket, make sure it is thick as the socket can bend if the O2 sensor is stuck very hard. The O2 sensor is located on the passenger side of the car on the exhaust pipe. Nothing needs to be removed to get to them. You can see one next to the positive cable nut (see picture) and the other next to the secondary air pump, both along the motor. Disconnect the wires to the O2 sensors from the brackets on the engine. Then disconnect an O2 sensor. Remove and install one at a time so as not to mix up the wires. Use a pickaxe or similar tool to remove the wires from the O2 sensors. My O2 sensor is very tight. I used the PB Blaster to unclip both O2 sensors and let them sit for a day. I tried it the next day and it came off easily. The only problem with using the crow's foot is that you have to take it off every round. What makes this time consuming is that it causes the wire to try to return to its original position. My advice: rotate with the houndstooth, hold the O2 sensor with your free hand, and then pass the houndstooth over the O2 sensor and rotate. Repetition. Keep it up and it will eventually work itself out. Or you can just buy a good O2 sensor socket and remove it in less than 10 seconds. The new O2 sensor already comes with anti-seize threads, so you don't have to buy one. Leave the plastic caps on the threads until you are finished installing so you don't have to remove the anti-seize coating. You have to press while turning so that the sensor is screwed in.
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