Hey everyone. Two or three weeks ago my truck started to stall at stops. My service engine soon light came on, on my 2003 f150 (80,000 mi ). Had Auto Zone run codes. They found 7 codes stored. (p0405, p0304, p1151, p1131, p0156, p0174, p0171 ). After finding a couple of vacuum leaks and changing plugs, I'm down to 1 code (p0405). I removed and cleaned the EGR vavle twice, and check that the plunger (sorry I don't know the technical term) was moving. All is good but not being able to figure out this code. My inspection was due in Oct. I know they will not touch it with the service engine soon light on. Hope someone can help. Thanks in advance

 

You have a faulty DPFE sensor. Search online for the part and it will show you a picture. When you repalce the sensor, have the codes erased and drive it a while before the inspection is done.

 

Thanks way2old. I thought it might be the DPFE sensor, but I needed an expert opinion, before I start replacing every sensor in the truck before I rectify the problem. I'll give the DPFE a try.
Thanks much.
hdel