What is the fault alarm after cleaning the throttle?

Just washed the throttle. The mixture will be too thick, so the computer will record that accidental failure. After driving to a certain distance, that situation disappears, so the fault light will go out by itself. I don't believe you can read the fault code by computer. It must show unexpected faults. The light should be an emission failure light. At the moment of ignition, the idle speed is almost 2000, which is reduced to 1000. I think so.