P0142 – O2 Sensor Circuit Malfunction Bank 1 Sensor 3

 

P0142: DIY Repairing Video Tutorial

https://youtu.be/LSRz0wxsgBI

Check out nonda Auto DIY Center for more engine error code repairing videos.
https://www.youtube.com/playlist?list=PL-Lyko0O0oxHe1AGvzwAz-wokJPXAtW97

 

P0142 Possible Symptoms

  Engine Light ON (or Service Engine Soon Warning Light),High Fuel Consumption,Excessive Smoke from Exhaust  

P0142 Possible Causes

  Faulty Heated Oxygen Sensor Bank 1 Sensor 3,Heated Oxygen Sensor Bank 1 Sensor 3 harness is open or shorted,Heated Oxygen Sensor Bank 1 Sensor 3 circuit poor electrical connection  

P0142 Description

  The rear heated oxygen sensor (or sensor 3 for some vehicles), after three way catalyst (manifold), monitors the oxygen level in the exhaust gas on each bank. Even if switching characteristics of the heated oxygen sensor 1 are shifted, the air-fuel ratio is controlled to stoichiometric, by the signal from the heated oxygen sensor 3. This sensor is made of ceramic zirconia. The zirconia generates voltage from approximately 1V in richer conditions to 0V in leaner conditions. Under normal conditions the heated oxygen sensor 3 is not used for engine control operation.