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Downstream O2 sensors do nothing but keeping an eye on catalytic converters performance. So, that's why you didn't get any increase in performance. Although, it is curious that a car that is as old as 90 has downstream O2 sensors.
Toyota and Lexus Join Mille Miglia For The First Time
Slideshow: A five-car lineup spanning more than five decades of Toyota performance and engineering will tackle one of Italy's most celebrated automotive routes.