Here is a quick way to reset your ECU. It is also known to clear codes thrown, and turn off the "Service Engine Soon" Light.
Confirm that accelerator pedal is fully released, turn ignition switch “ON” and wait 3 seconds.
Repeat the following two procedures quickly five times within 5 seconds:
Fully depress the accelerator pedal (HARD).
Fully release the accelerator pedal.
Wait 7 seconds, fully depress the accelerator pedal and keep it for approx. 10 seconds until the CEL starts blinking.
Fully release the accelerator pedal (while the CEL is still blinking)
Wait about 10 seconds.
Fully depress the accelerator pedal and keep it for more than 10 seconds.
Fully release the accelerator pedal (The CEL light will continue to blink).
Turn ignition switch to “OFF” position and now you can start the car. The CEL light should be gone