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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.

Vehicle: 1999 Ford Mustang 200

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P1405 DPF EGR sensor circuit low voltage detected

This is for the DPF sensor which the EGR uses,

Ford Mustang DPF EGR 

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

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

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