obd2 port

Hello, I’ve noticed that some distributors offer cold air intake kits together with an OBD programmer, claiming that the device can be used to tune the ECU and improve the car’s performance. What do you think of this option? I don't know if I can put links or provide names, but I think that...

So I have been having issues with my procal 4. I would plug it into the port and would get power. But says ecu not found.. new it was not fuse since I got power. I unplugged the back connector and it looked good. I pushed the wires in to make sure. Did not work. Now this is a 21 mustang with...