Heres the scenario: bank 2 o2 sensor went pop. It stayed like that for some time, 2 months approx until I could get it replaced. Now when I pulled out the plugs, I found that bank 2 plugs where creamy colour and bank 1 plugs differed in colour.
My question is, has the non functional sensor caused the plugs to change colour and should it affect running order? The car isn’t driving as smoothly and having checked my fuel trim values, bank 2 readings are at around +3%. And bank 1 readings are close to 0%. Would I be right in thinking that the increased percentage in bank 2 is due to the plugs?
325 o1 manual