Check engine light

I've always had success in getting my service engine light to reset by just disconnecting my negative battery cable for a minute. Unless there's reason for a code to set again and light it up, doing this with the battery has worked to turn it off after I have repaired correctly. I have yet to have to purchase a scanner/code reader. The newest I've used this fix on was an '03 though, and it may have since changed? I'd be interested to know if that be the case.

LedFt

Ok. Thanks for the explanation. I knew about the 're-learn' period, but was under the impression that it doesn't take a lot of time for it to go through this process. About how long does it typically take? As far as the readiness for an inspection, I could see the logic there, if the 're-learn' actually takes a while to complete. What is still unclear however, is, if the situation involved taking a vehicle to the shop for repairs needed for the inspection. It just seems to be that the first instruction, for just about any of the repairs I have ever done, is the disconnection of the battery. Is the reset done prior to the repair? Even in doing that, is the battery disconnect just not typically followed in the repair shop setting? When the scanner is used to reset the system, does the 're-learn' only apply to the code setting issue. Or does the system even go through the process at all?
Obviously, you don't have to answer my '20 questions' :oops: it just has me curious to understand.

LedFt