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what are they and how do i fix em?

if ox sensor is bad where is it located.

then how do i get check engine light off?
 

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P1443 Evaporative Emission Control System Control Valve

P0136 02 Sensor Circuit Malfunction Bank 1 Sensor 2

PO141 02 Sensor Hdeater Circuit Malfunction Bank 1 Sensor 2

The 02 sensor codes are for the post catalytic converter sensor. It is located in the exhaust pipe underneath the car. The number 1 sensor is up under the hood near the catalytic converter. After the problems have been repaired the check engine light will go off after a while or you can disconnect the battery for a few seconds and that will turn it off.
 
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