Sorry to hear you've had so much problems. I have a 2016 3.2L diesel with 120K miles. I had both the EGR Cooler and DEF sensor replaced recently before the warranty expired, although I was not sure if the previous EGR cooler had problem. I'm watching all the parameters carefully while driving with ForScan. I'm mostly concerned about the DPF soot level and regeneration frequency.
I am not an expert on diesel engine, but I question that engine chugging is caused by the EGR cooler. Did the engine light turn on and what are the codes? Where are you located at and which dealers did you bring your car to? I'm in San Jose. I have taken my car to 3 different dealers and am not impressed at any of them. The last dealership was the "best", and the service manager gave me the number of a nearby independent mechanic. He said diesel mechanics are becoming rare at the dealers and actually recommended this guy a block away. This independent mechanic shop had very good review. I came to talk to him - he seemed very knowledgeable on the diesel engine and the EPA equipment, although he never serviced the Ford Transit Diesel engine before. If I have any issue I will bring it to this guy.
So ... you may want to call and ask around for a good diesel mechanic in your area. I don't trust the dealership anymore.
I am not an expert on diesel engine, but I question that engine chugging is caused by the EGR cooler. Did the engine light turn on and what are the codes? Where are you located at and which dealers did you bring your car to? I'm in San Jose. I have taken my car to 3 different dealers and am not impressed at any of them. The last dealership was the "best", and the service manager gave me the number of a nearby independent mechanic. He said diesel mechanics are becoming rare at the dealers and actually recommended this guy a block away. This independent mechanic shop had very good review. I came to talk to him - he seemed very knowledgeable on the diesel engine and the EPA equipment, although he never serviced the Ford Transit Diesel engine before. If I have any issue I will bring it to this guy.
So ... you may want to call and ask around for a good diesel mechanic in your area. I don't trust the dealership anymore.