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You have to read the code to get a clue of the problem.(code scanners won't exactly tell you the problem,but they lead you in the right direction).Some codes (like a lean condition) are fixable with no parts.
Disconnected the battery few minutes is some way to reset the PCM stored codes; if this come back again, need scanned the PCM (Powertrain Control Module) to know exactly what is this fault code ans clues to solution.
You need to extract the error codes in order to know what is happening. It takes a code reader, and then you use those clues to determine what is wrong. Remember, the codes are not the answer, just a clue in many cases...
The code clearing happens via two things> first, resolve the issue causing the error code. The code will come back if you do not resolve the issue. you can clear the codes by using a code reader, but it woudl likely reappear. Fix the issue causing the error code.
Remember, the code is a clue, not always the issue.