P0420 error (Catalyst System Efficiency Below Threshold ) - Toyota Yaris Forums - Ultimate Yaris Enthusiast Site

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P0420 error (Catalyst System Efficiency Below Threshold )

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09-27-2017, 10:22 PM	#7
kiimboy Drives: 2009 Toyota Yaris Sedan Join Date: Sep 2017 Location: HI Posts: 6	Is the post cat one the downstream? Sorry, a car noob here lol

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