I had trouble code p2195 change O2. Then trouble code p0135 popped up on a 2004 crown victoria. I changed the oxygen sensor twice. The code popped up again. Any suggestion on why?
That code may be the O2 heater fuse is open. To prevent a false reading before the engine warms up O2 sensors have a small heater that insures the Platinum wire inside will react to emission levels. The 4 wires on the sensor are +12 -12 +signal -signal the output signal is very low and varies between .3 volts to about . 9 volts and the car computer want's to see between .45 to .55 volts ( some computers will hold a tighter tolerance) .... Check the 12 volt fuses ... you may have a blown fuse
Ok thanks. Where us the location of the 12v fuse.