207 exhaust emission system malfunction

Friends, please help. About two months ago, while driving 30 to 40 km / h on the move, it made a shock as if the car had been hit from the back. The second time, while starting marching, he again missed it, then I waited for a moment, of course, 1 minute, of course, the traffic was convoy. I asked a friend who tied the pc who understood this work and said it was due to bad diesel. Your warehouse was empty 4 or 3, and I filled the tank from a different place.
But as of day, I had the same problem today. Does anyone know why it originates ....

it means that it was made of bad diesel again. if it was corrected by changing it in the first one, that's the reason for the present

I have not had such a problem since I bought it. I experienced this problem when I bought diesel from a different place and now I get it from the old place but I have experienced the same problem again. There is something different as if it is not due to diesel oil. I wrote in the form to see if it happened to you, but it seems that no one has happened to you

First of all, my brother. I also have 207 1.4 Comfort with LPG. I have been experiencing this problem for about 5 months and still have not gotten a solution. When I first received this malfunction, I bought the Charger alternator a few months after inserting it into the draft. I went to Ankara ABC Peugeot service 5 times about this fault. Part of it changed every time I went, but the only thing that didn't change was the fault log. Charge alternator, ignition coil, spark plugs and battery changed. When they could not solve the last problem, they said it is not related to us because your vehicle is Lpg. So they defended me from the beginning. 2 days ago, I removed the Lpg connections and made the car original. While I was glad that I didn't get the fault record yesterday; I got the same fault record today in the morning. I think this problem usually happens to me in cold weather. Is there anyone who can guide me in this regard or recommend a master in Ankara?

Friends found a problem because I did not want to wear it because I love my car. I was changing vides at 2000 and 2500 rpm. The car was 1.6 hdi. This was causing the egr valve to clog when the diesel was bad. I recommend it to those who live in Istanbul.
Atatürk auto industry 2. Part 22. Sok no.733