What tools do I need to remove the rear sensor . The one on top of the engine . I can't get to it . So dam hard
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The one on top of the engine is the upstream sensor. The downstream (or rear) sensor is located in the front exhaust pipe in the center, towards the passenger side. It's easy to remove with a 22mm wrench or a large adjustable wrench.
The upstream one is in a recess and would require a socket wrench.