Yaris 2001 The engine yellow/orange warning light in the dashboard

[cabbage2001]

Hi all hope someone can help

I by mistake put 1L of home heating oil in the car use the wrong pump at the station. I was told at the time just to fill the car and it would run out though the engine. But now i have a problem with the warning light and the car is chugging in first and second and when the car is sitting in neutral.

I have changed the air filter and spark plugs and later today i will do a oil change.

If anyone else has any other ideas on stopping the chugging or will i have to take it to a garage.

thanks


Colin