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The P0402 code means that OBD detected an excessive amount of EGR.A code P0402 most likely means one or more of the following has happened: The DPFE (differential pressure feeddback 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.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.remove the EGR valve and check for carbon build up,on the valve and the EGR passages.make sure the vacuum hose going to the valve is not split,cracked,leaking vacuum,and hooked up.check the 2 hoses coming from the DPFE sensor going to the exhaust tube,they have upgraded hoses for this at most parts houses.if you have the metal DPFE sensor,then it's the original,the new upgraded one is black plastic.they are bad to fail also.