Depending on if you have a Cali Spec eclipse or a Fed. Spec eclipse, If you have a Federal Spec. you only have an oxygen sensor before the cat and right after the cat. and you won't have one in the header.
Upstream Oxygen Sensor heater performance. That will be the first oxygen sensor in the exhaust pipe ( closest to the engine ) on the passenger side head. You need to check the wireing connector that hooks to the oxygen sensor for a broken wire are bad connection. If you find no problems, then replace oxygen sensor.
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