Okay so i have a b18 ls motor. I just double head gasketed it and i purchased a professionally chipped and tuned ecu off the internet. When i start the car, i got a ECU code 3 on my ecu which i looked online is map sensor. Now i didn't think the ls had a map sensor. I looked at the ecu and i guess its a b16 ecu chipped for a LS. Now am i only gettin the code because of the ecu or does my car really have a map sensor. Thanks, Jim