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The upstream and the downstream sensors are both really easy. Upstream is on top of the exchaust manifold and downstream after the catalytic converter. You need a wrench and hands. The ratchet or wrench should be of the open type, like a crowfoot. Careful removing the clips for the harness, which are close to the sensor itself. The plastic gets brittle. You DEPRESS the tab to release the lock on the connector. You do not pry it loose. You have the manual?
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See my car's mod & maintenance thread and my electric bicycle's thread for ongoing projects. I will rebuild Black and Green over decades as parts die, until it becomes a different car of roughly the same shape and color. My minimum fuel economy goal is 55 mpg while averaging posted speed limits. I generally top 60 mpg. See also my Honda manual transmission specs thread.
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