i have a ford crown vic 2001

Question

oxygen sensor 2 bank 2 catlityc replaced but p0156 comes on

Answer 1

P0156 -02 sensor circuit malfunction (bank 2 sensor 2)

For this code to appear the ECM sends a current to turn the heater circuit on and off and measure current going through the 02 sensor.If the current is not a specified value the heater circuit of the 02 sensor is at fault, The connection to the Bank 2 sensor 2 ,oxygen sensor should be through inspected for proper contact, The heater voltage circuit of the 02 sensor in question should also be made, if it is not at its specified value, the ECM may need replacement