not sure what to ask for at the part store to fix this problem|||http://www.obd-codes.com/trouble_codes/
Symptoms
You may notice drivability problems such as the engine may surge off idle. There may also be other symptoms.
Causes
A code P0402 most likely means one or more of the following has happened:
* The DPFE (differential pressure) sensor is faulty and needs to be replaced
* There is a blockage in the EGR (most likely carbon buildup)
* The EGR valve is faulty
* The EGR valve may not be opening due to a lack of vaccuum
Possible Solutions
With a P0402, it is common for people to replace the EGR valve, only to have the problem return. The most likely solution is to replace the DPFE sensor.
* Check the voltage at the DPFE sensor both at idle and when the EGR is open
* Replace the DPFE sensor
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I have a 1998 ford expedition and my check engine light came on and the code that came on was p0402 and i dont understand why cause i just got my truck back from mideas who is a mechanic place not even 24 hours
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