Depollution system faulty error

Dear Peugeot owners. Good evening first of all. My vehicle was 2009 1.6 hdi Auto 6r premium 308. The vehicle gave a depollution system faulty error in 2016. When I took it to the service it was said of egr malfunction. The price came expensive. I cleared the fault and continued. There was no power loss in the vehicle. After that, after giving the same error many times, our master said let's change the egr valve in Malatya. We spent money and changed it. The car said okay. We left happily. Same mistake again when going the long way. We came back to the master. The master is aware that he cannot handle the fault, but I am not. He didn't even look at the vehicle. I went to another master I saw more honestly. Connected to the device egr malfunction. I said egr new. They also wore another zero egr. Fellow particle agreed to consign the goods. Egr malfunction in the vehicle again. It is being deleted, written back. They said that the brother will look at the brain. We went to the brainchild, introducing another brain and started the vehicle. The malfunctions are still the same. I bought myself obd2 device. Fault codes that never go away PO402.P0409.P0489.P0490.P1351.P1459 If something like this happens to you, help me guys. I guess they fed the vehicle to me. Meanwhile, there is no power loss in the vehicle. Most of the time the fault happens when I turn on the air conditioner. Element19872020-06-22 23:23:49

Master, get well soon ,, p1351 glow plug, ,, be sure to replace it ,, as long as the glow plug does not explode properly, the egr.de is clogging, the engine technician is certain information I learned from a brother ... also I have all the other fault codes ,, I have I went to our mechanic brother for the second time, and it was said that every time use high speed, press less gas, I also have no power loss, black smoke etc. no but the engine fault lamp lights up from time to time ,,, sometimes goes out, if anyone has reached a definitive solution, I would be glad if he shares his information. My vehicle 2011/308 - 162,500 km.