i just swap in a a6 motor and it came out 2 long blinks and 8 short blinks and i know it cant be 28 cause it doesnt exist so im guessing its 20 electrical load detector and the 8 blinks could be TDC sensor...cause when the battery is connected i can see my CEL with out the key on...i going to double check my work but if any knows what it is....let me know