Code - Toyota Yaris Forums

Tony's backyard · 11-13-2015, 09:34 PM

Hi,I'm new to this four pardon me if I make a mistake. I just want to ask question regarding code P0420 it say bank 1 which sensor this refer to? It is before cat or after. Thank you very much.

CTScott · 11-13-2015, 09:59 PM

0420 is Catalyst efficiency below threshold, which can be an issue with either sensor, or can be due to an exhaust leak or cracked manifold.

Tony's backyard · 11-13-2015, 10:16 PM

I check a possible leak,I don't see or hear a leak. If you say could be a sensor which sensor is that?

CTScott · 11-13-2015, 10:20 PM

Quote:

Originally Posted by Tony's backyard

I check a possible I don't see or hear a leak. If you say could be a sensor which sensor is that?

If you don't have an exhaust leak, then it is more likely a bad cat, than one of the two sensors.

11-13-2015, 09:34 PM	#1
Tony's backyard Drives: 2007 Toyota Yaris Join Date: Nov 2015 Location: Winnipeg,Manitoba, Canada Posts: 8	Code Hi,I'm new to this four pardon me if I make a mistake. I just want to ask question regarding code P0420 it say bank 1 which sensor this refer to? It is before cat or after. Thank you very much.

11-13-2015, 09:59 PM	#2
CTScott ULTIMATE View User's Garage Drives: 09 5dr LB, 2x 08 3dr LB Join Date: Oct 2008 Location: USA, CT Posts: 13,460	0420 is Catalyst efficiency below threshold, which can be an issue with either sensor, or can be due to an exhaust leak or cracked manifold. __________________

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11-13-2015, 10:16 PM	#3
Tony's backyard Drives: 2007 Toyota Yaris Join Date: Nov 2015 Location: Winnipeg,Manitoba, Canada Posts: 8	I check a possible leak,I don't see or hear a leak. If you say could be a sensor which sensor is that?