Pre- Cat o2 Sensors.......Everything I've searched came up pre-cat o2 sensors,i need some explantion of codes
Fuel Control (Bank 1 Sensor 1)
andP0170 Fuel Trim Malfunction (Bank 1)
need help on understanding so can be fixed
when one fails the other one follows shortly this happen to me on my vw jetta i changed one and a month mater the othe one went out on me if its bank one sensor one then its the one that comes from the engine to the muffler/catso my car has 2 o2 sensors?
anywya to test them?