i have 1 short blink so i guess thats a code 1. but i don't understand why it is not repeating like all other codes i have ever gotten. it just does one short blink and then stays on. i changed the 02 sensor and reset the ecu but the CEL is still on but the car is running fine. is this really a code 1? is 1 short blink and then staying on the code for bad ecu?