I have recently had an engine swap on a N reg cav v6 due to bent valves easier to swap engine. I used old ecu where engine managment light used to flash but there were no codes present now the engine management light is on permanently......havent read fault codes, going to try paper clip test if needed but looks complicated to me so im hoping it could just need ecu resetting to accept new engine?
New to all this any suggestions welcome or should I have swapped ecus??
Thanks in advance