I've reset mine in my GT several times to clear trouble codes and such. No noticible gains. I think the only way you're gonna notice a power difference is if your engine went into a limp mode or something where it retarded your ignition or something because it detected a knock, or some such. The LX's don't have knock sensors or anything, so, I don't think you're gonna see any gains. However, if you want to try it, it won't hurt anything. You'll just have to set your clock and radio stations again. Disconnect the negative battery terminal, then hold the brake pedal down for a while, some say 10 seconds, some say 20. I'd go 20 to be safe. Then reconnect your negative battery terminal, and voila.
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