1999 Ford Mustang 200 with engine code P1405

Question

check engine light on . . . P1405 code comes up, no DTC definition on file, had auto zone "read" it and this is what they came up with - nothing.

Answer 1

P1405 DPF EGR sensor circuit low voltage detected

This is for the DPF sensor which the EGR uses,

 

The DPF is for the EGR system, here  is one for a typical Ford Mustang,

Answer 2

P1405 FORD Code - DPF EGR Sensor Circuit High Voltage Detected
Read more: https://www.autocodes.com/p1405_ford.html