[CiscoPath]

^^Most people who get the code generally just take it to the dealership and get the Relearn. I don't know of anyone who didn't get it just to SEE what would happen. I can tell you that without the Relearn, the speed limiter is removed and the fans do stay on after the car is turned off for cooldown, so some features are automatic. But from what I believe, the Relearn is for the Crankcase Position which controls the timing advance i.e. spark/fuel ignition. With the fuel map being advanced more by the new PCM but not have the Relearn adjusted to it will make it run rich..............or lean. One of them, I dunno.

On the other hand, the SES code is thrown whenever the PCM is removed, whether replacing it with an upgrade or removing the stock one for God knows what and putting it back in. It's a safety feature. On the latter, I believe the car would still run fine with the stock. Can't say the same with the upgrade though with the changes made to the map, so just play it safe and get it cleared.