206 Quiksilver Catalitic Convert Fault

Hello friends, the problem that both services cannot solve in my car still continues. Problem: When the vehicle is switched to Lpg at the first start, it gives catalitic convert fault error and works strange. This is not a problem while in gasoline. When the temperature of the vehicle reaches 70 degrees, the problem disappears in LPG. They took the pc to the service, tied the pc and said it was okay. No catalyst in my vehicle, silencer connected oxygen sensors, lambda sensor, ignition coil etc. controls were also done, and there were no problems. What could be the problem? I'm waiting for help. Best regards

If you have a lpg injector checked, I don't have a catalyst in my teacher, there is a problem with that silencer in your vehicle or they couldn't adjust the lambda sensors exactly.

Previously, there was no such problem that they would have completely removed the exhaust or something. But I did not look at the injectors.