I have error code 1401. How do I fix it ?

I have a Ford Sport Trac and I have error code 1401. How do I fix it ? i already tried replacing the EGR Valve and it didn't fix the problem.

Answer:
Not sure why you replaced the egr valve but when you replace that part you should also replace the egr regulator and sensor..


Replace the DPFE Sensor. It is extremely easy to do , order a new one from the dealer( have your vin# ready ).