2012 Toyota Tundra 5.7L here. Not an original Toyota sensor but does the job. I replaced all four O2 sensors with KAX brand sensors. The top sensors work great. Lower sensors - no. You will drop PO141. I bought all four along with a mass air flow sensor and PCV valve to address PO171 and PO174. Aside from the return of the bottom sensors, I'm happy. The truck runs smoother than before.
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