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I got the engine codes P1406 and P1401 on my 2001 Ford F150 4.6L V8. I change that sensor and it lasted 2wks and the light came back on

Vehicle: 2001 Ford F150 4.6L V8

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P1406 EGR downstream pressure hose

P1401 DPF(differential pressure  feedback)  EGR circuit malfunction

Check the hose that the sensor connects to. with engine running exhaust should be able to come out, Either the hose got plugged or the pipe is plugged.

 

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P1401 FORD Code - DPFE Sensor Circuit High
Read more: https://www.autocodes.com/p1401_ford.html

P1406 FORD Code - DPFE Sensor Circuit Downstream Hose
Read more: https://www.autocodes.com/p1406_ford.html

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