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Not hard if its easily accessible. Some are easier to reach then others. You will need a special socket tool that goes over the wire so you don't damage it. Most auto parts stores carry them. Go with a OEM replacement rather then a universal that way you can plug the wires right in instead of splicing the wires.
Really varies by car model. Most older cars have only one, for example on a Toyota 3S-FE engine, the O2 sensor is right up front on the exhaust manifold, really easy. Some newer cars have several, some ahead of the cat, some behind, a lot of V-8s have 2 sets.
Yeah, definitely make sure you use O2 safe anti-seize, but get some and use it.
In many cases a special socket really helps in doing the job.
My car has four O2 sensors and I never needed a special wrench to remove them. You can use a flare wrench if you want. If you're replacing it, you can probably just cut the wire, since the new one comes with a wire and the plug is at the other end.
I have 4 in my 96 Caprice...what a pain in the ass to replace using jackstands...uuuughhh. One will be easy, and you will be all happy, then the other can take several attempts over the course of a week or FOUR, until you finally take it in the a shop and have them loosen it with their lift and air tools.
Luckily I was having exhaust work done and they did it for FREE.
My car has four O2 sensors and I never needed a special wrench to remove them. You can use a flare wrench if you want. If you're replacing it, you can probably just cut the wire, since the new one comes with a wire and the plug is at the other end.
Try using a line wrench on an O2 sensor that has been in a car for 150,000 miles in the rust belt.
I have an oxygen sensor wrench that goes in my air hammer for that very reason. ANd also, not all oxygen sensors are accessible to the point where you can get a wrench on them.
Hyundai Tiburon comes to mind. That engine is so shoehorned in there that you cant fit a wrench anywhere.
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