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There are three O2 sensors. Bank 1 Bank 2 and a down stream one. Make sure your changing the right one. Get an O2 sensor socket. After your rx is cooled down, spray penetrating oil on the threads of the bad sensor, let it soak, go inside and have lunch. When your done eating unclip the harness of the bad sensor. Use your O2 socket and turn out the old sensor. Apply anti-sieze to the threads of the new sensor and install it. Plug it back in.

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