how to?
How to WHAT?? Change them?? They are kind of like spark plugs. But sometimes extra effort is needed to remove them…Try not to damage the wire or connector…
Don’t just change them without knowing why though. “It’s probably an oxygen sensor” is something of a very common thing said among those who don’t know very much. Its not that O2 sensors don’t go bad - they do. But there are lots of perfectly good O2 sensors in the dump. A lot of the people who sent them there end up here saying things like “I replaced my O2 sensors, why is my check engine light still on?”