Hi, everyone.. This is my 2nd post here, new to the forum.. I have had my blazer now for 2 years now and just now the check engine light came on, so I checked it out.. The code P0155 " H02S Heater Performance Bank 2 Sensor 1" Is this my O2 sensor that went bad?

 

Diagnose the issue.

P0155 - Heated Oxygen Sensor Heater Circuit (bank 2, sensor 1)

 

Thanks for the info.... Are there any pics, or info on the exact location of the sensor since I think there are three of them under there?

 

I believe bank two is the one for cylinders 2, 4, and 6. Sensor 1 would be the first one that is closest to the beginning of the exhaust manifold.

 

Bank 2 is the passenger side of the engine. The B2S1 sensor is the one closest to the exhaust manifold as tazz stated.

 

Ok, I think I have everything that I need to know now.. I appreciate your help guys!

 

So you guys think I should just change the sensor anyway as my first step? I mean the truck does have 120.000mls on it. I think it would be time to freshen that sensor up anyway..