Injection failure lamp

Hello friends. I have the 2005 model 206 x design. The injection malfunction lamp has started to light up for the last 1 month. They showed a few masters in the Tokat industry. someone said because of lpg. I went to the atiker service and said the room is not related to us. I went to the last peugeot service, they are from the oxygen sensor. They said this is a problem with LPG vehicles. They said to your head. but at first there was no problem. Now when he first runs on gasoline, the car is running hard and going with a strange voice on his way to the road. it stops when I stop. I do not understand. Have you ever encountered this problem? I'm waiting for your help. Thank you from now.