Engine Light on my car's dashboard

Hi Pros,

The problem I wanted to seek your help with is the Engine light that remains on when I start my car. Ok, this is actually connected to engine's accelerator, when the car is stopped but engine is running, the engine light is on, when I accelerate the car slowly the light start flashing and then when I continue pressing accelerator pedal it just disappears.

Same is the case when the car is running, like when accelerator is low (after gear transmission etc) the light starts blinking and when I increase the accelerator light disappears.

Please note that I have changed engine oil 2 days before but the problem persists. Any words?

Many Thanks
Mark