I have a Ford Fusion. I am looking at the sensor on top of the exhaust with a collar, and I cannot see how to undo it. I put the image in to show what I'm dealing with.
I don't see a way to fit a socket onto it.
How do I remove this lambda sensor?
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It should look something like the following picture. The flats for the wrench are at the bottom so you may not be able to see them depending on the location. They also might be covered by a heat shield.
You use something like the tools pictured below to get it off.
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In addition to Bob's sock puppet's O2 socket and crow's foot suggestion, I'd like to add that O2 sensors are usually size 22 mm.
In a pinch, a 22 mm spanner/wrench with enough leverage will also do the job. It helps to soak the threads in rust solvent prior to removal.
