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When you say you cleaned the ports which ports did you clean.? These engines are very sensitive and do build up lots of carbon on the small egr vacuum ports. The focus here is usually the vacuum port inside the intake manifold that is behind the throttle body. Take the throttle body off and look inside you will see usually a big deposit of carbon where the port is to be. That needs cleaned. You also need to check the vacuum line that runs from the intake manifold over to the right strut tower. This goes to your boost sensor solenoid. Make sure that that line has good engine vacuum. If it does not clean that port as well. If that line is clogged I have seen the carbon get so bad that it clogs the boost sensor solenoid and the vacuum line after the solenoid. All of these ports need cleaned not just one.
Check the passages under the airhorn. When carbon builds up the diagnostic blames the EGR for not opening and throws a code. Actually there is no flow to the EGR because the port is clogged and the diagnostic measures the flow after the EGR.
They really needed to have a sensor before and after the EGR. Also remember to disconnect the battery for 10 minutes to remove old info.
remove the egr valve take a piece of clothes rack or a tiny tiny screw driver carefully clean out carbon in the intake port hole on the intake.the carbon blocking off the egr valve.so it cant work properly.after cleaning carbon clean up the debris and go from there.
P1400 on your vehicle is described as :Differential Pressure Feedback EGR Circuit Low Input
You either need a new DPFE valve, or a new EGR valve. Both can be tested for functionality before replacing them both. EGR valve is more likely I think. Cleaning it may not improve its performance, but its worth a try. Also check the vacuum lines between the DPFE and EGR system. The EGR valve and DPFE are usually close together above the exhaust manifold/downpipe. you need service instructions to test these items, suggest you go to a garage really...