P0051 CHEVROLET – HO2S Heater Control Circuit Low Bank 2 Sensor 1

 

P0051: DIY Repairing Video Tutorial

https://youtu.be/bZ_a_l1SuqM

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

 

P0051 CHEVROLET Possible Symptoms

  Engine Light ON (or Service Engine Soon Warning Light)  

P0051 CHEVROLET Possible Causes

  Faulty Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1,Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 harness is open shorted,Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 circuit poor electrical connection,Heated Oxygen Sensor (H2OS) Bank 2 Sensor 1 fuse,Faulty Engine Control Module (ECM)  

P0051 CHEVROLET Description

  The Heated Oxygen (HO2S) bank 2 sensor 1 is threaded into the exhaust manifold. The sensor is equipped with a heater element to decrease the amount of time required to enter closed loop fuel control. The Engine Control Module (ECM) controls the heater by pulsing circuit 551 to ground. When the heater is commanded Off (circuit not grounded), the voltage level at the ECM should be high (ignition voltage). When the heater is commanded On (circuit grounded), the voltage level at the ECM should be low. The ECM heater feedback circuit uses a pull-up voltage (1.6-3.6 volts), which allows the ECM to individually differentiate between an open, short to ground or short to voltage.