Here's some reading on the matter
http://www.ford-trucks.com/forums/342419-how-to-test-your-dpfe-sensor.html
SOURCE: CODE P1405
Check the hoses to the DPFE sensor from the exhaust pipe, the sensor is near the EGR valve, if the hoses are ok then replace the sensor, careful not to tear the special heat resistant silicone rubber hoses, they are about $10 each and ordinary rubber hose will burn up.
SOURCE: P1405,P0141 F150 2001
Ford has problems with the DPFE sensors that has to do with the EGR. its just a code that points you in the direction of the problem. you could have a bad DPFE or egr or just a simple clogged hose. there should be 2 hoses on these f150s the only way to tell is by checking hoses otherwise you need more tools to check these things. a vacuum test on the DPFE sensor to see if it reacts.
the other code is an O2 sensor code. heater problem. could be different problems or a bad O2 can cause a rich condition cause low fuel mileage and also cause the EGR system to clogg over time.
I dont knwo what else to help you with because its one of those things that just needs to be looked at in person. your best bet is check the DPFE hoses. should be near EGR and look for rubber hoses connecter to a sensor. should have 2 hoses connected to it. Google a pic of one so you knwo what they look like.
Good luck
Michael
ASE certified
plz rate
SOURCE: my 2000 ford taurs engine check light is on with
Check vacuum lines running to the valve covers the rubber end sometimes get holes and have to be replaced. One on the front and one on the back valve cover. Also check the pvc valve tube running under the throttle body same thing the rubber connector gets a hole in it. One more thing check the gas filler neck when you take off the gas cap look for hair line cracks in the plastic coating thats on the inside at the top its gray in color.
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