Well the code you are getting is not the worst! Think about it, Code: 0401 which is, EGR Flow Insufficient Detected. It cant be to many things like other codes. It could be a blocked hose coming from the EGR, maybe one of the hoses came off the DPFE sensor, the DPFE sensor is bad it self or the EGR is bad. Start with the easier things like the hoses being clear and attached right. Than maybe the EGR itself and the sensor! Good luck man!
applying vacuum manually is very simple. get a piece of hose the size of the one to be disconnected. unhook the vacuum line from the component to be tested (like the EGR valve) and plug it. put your scrap piece of hose on the nipple of the EGR (it needs to be a tight fit)and SUCK ON IT.
you have just applied vacuum.
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