PCM reset

[kps36]

Okay, I have posted in other places and now I will ask you guys.
I have always and always will disconnect the negative battery cable to reset the PCM after a mod or after, and this is the key, I have remedied the CEL. That has always worked.
I will not bore you with the details, but I had a guy at a parts place tell me that doing the disconnect thing won't work. The reset has to be done with a reader/scanner.
This is OBDII.
Is this guy blowing smoke or smoking blow.?

 

[Alec]

IMO, if you've fixed the problem that caused the CEL and reset the computer by disconnecting it, that is ok. The code should disapper. However, if you're resetting the computer the clear a code that hasn't been fixed, the code will resurface and you're just fooling the computer and yourself.

That being said, it is better to clear a code with a scanner than by disconnecting it. But if disconnecting it's all you got, then go for it.