My 2004 xc-90 keeps throwing the P0154 code - (O2 sensor?). Are the Oxygen sensors easy to replace? How many are on this volvo and how would I know which one (the code says something about bank2 or something like that). Thanks!

 

I also have a 2004 xc90 (t6) I have been getting this code as well. It is O2 sensor bank 2, sensor 1. I have been getting conflicting information as to which sensor it is. Does anyone know definatively which one it is? Is replacing that one likely to fix my problem?

Thanks