I bought this ecu to see if my oem ecu was good or not. My car had idle and starting issues for a while. I’ve replaced countless sensors. Car wouldn’t pass smog and it had no check engine light or codes. So I figured what the heck the ecu might be bad. I plugged this one in and when I started the car it was idling fine and would start right up. Car runs so much smoother. All the issues I previously had are gone now thanks to this replacement. So it’s confirmed my old ecu is bad.