[Ali A]

Hi, I have some issues with my car, it has now started to use more fuel than it used to. The car is modified and is decatted but there were no problems before. I decided to scan the car and the error I'm getting is this:

12A308 - Oxygen Sensor After Catalytic Converter, Dynamics, From Rich To Lean: Slow Response

Can anyone help me on this matter, I have done some research and everyone is saying different things, there is no warning light on the dashboard either as someone said there should be.

Any help would be appreciated, thanks in advance.