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The easy way is to disconnect the negative cable on the battery for about 20-30 minutes or more. This resets the codes and clears out any garbled programming that may have entered the chips during operation by allowing the power to totally leave them. It's like rebooting you home computer, has the same effect. If your problem was solved by doing this it will run better.
The reason you don't disconnect the positive side is because of the potential to hit a grounded area with the tool you are using causing a spark. In some cases this has been known to fry the ECU. Better safe than sorry.
Also most auto parts store will read the codes for free and clear the codes as well.
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