Too bad ya missed the recall, 96 and 97 civics were covered for 14 years, 150k miles for the headers due to a california lawsuit that ended in this wierd TSB.
What it MEANS is that the circuit has a problem. It can be the oxygen sensor, but it may be worth it to double check. The ECT or Engine Coolant Temperature sensor could be giving a wrong reading, meaning something else could be causing it to screw up, wiring, etc, though its more likely to be the sensor, it could be a loose wire or somethin.