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Hi all,


First time posting so excuse any error I may make. I have a 2012 Toyota Yaris that just started to display a check engine note. I used a scanner it came up as a P0137 Oxygen Sensor Circuit Bank 1 Senor 2. Going to attempt this myself as the dealer want $400 plus taxes, any guidance on what one it is or a diagram would be greatly appreciated.


Thanks
 

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puddleglum2
2000 Toyota Echo
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73 Posts
Bank 1 sensor 2 is the post cat sensor. It could be a bad sensor, wiring to the sensor, or it could be indicating a problem with the cat. Its main purpose is to monitor cat efficiency. If it's never been on before, I'd try clearing the code and see how long it takes to come back. The post cat sensor is the least important one and shouldn't affect how the engine runs.
 
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