Upper O2 sensor replaced but did not fix the problem - Toyota Yaris Forums - Ultimate Yaris Enthusiast Site

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Upper O2 sensor replaced but did not fix the problem

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04-05-2013, 08:59 PM	#1
Hard_Yaris Drives: 07 Yaris Join Date: Dec 2009 Location: Edmonton Alberta Posts: 109	Upper O2 sensor replaced but did not fix the problem OK... HELP please.. I am still getting the po420 code after replacing the sensor closest to the motor. Right away I noticed the increase in performance... then i tripped the code again... Do I have to replace the second sensor as well...? My car is at 160,000Km. original exhaust... What should I do to fix the code?

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