A anthony q New member Joined Nov 5, 2010 Messages 1 Reaction score 0 Points 0 Nov 5, 2010 #1 I keep getting p0420 low threshold bank 1 error code, mechanic suggested changing bank 1 O2 sensor that did not fix it, he then suggested Shell gasoline and Sea Foam fuel treatment for a few weeks that did not fix it, what do I try next?
I keep getting p0420 low threshold bank 1 error code, mechanic suggested changing bank 1 O2 sensor that did not fix it, he then suggested Shell gasoline and Sea Foam fuel treatment for a few weeks that did not fix it, what do I try next?
