I got the engine code P0403 on my 2003 Ford Escape XLT 3.0L V6

Question

recently left car with friend while out to sea, alternator was changed . upon me returning i start car and drive a way check engine light comes on. use code reader and codes are for both 02 sensors downstream, i replace, turn light off , light comes back on . same codes, upon removing passenger tire inspecting alternator and wiring i notice o2 sensor wires melted. fix the wires turn off light , drive light comes back on, use scanner now code is p0403. no o2 sensor codes so that problem was solved, now have changed solenoid and dpfe sensor, same code is still there, signed up for all datadiy and was attempting to check for short and open ground but alldata cant show me right connector for my vehicle,

again parts change were EGR vacum regulator valve and DPFE sensor. any suggestions on where or how to check for shorts are open ground

Answer 1

This code points towards an issue with the exhaust gas recirculation. Here is a list of possible causes for you.

P0403 FORD Code - Exhaust Gas Recirculation Control Circuit
Read more: https://www.autocodes.com/p0403_ford.html