Re: V6 Missfire
N/A = not available, as in not equipped. O2 sensor may be working good, as Cat is Ok, but sensor may be slow in getting to operating temp, as in no heater,
Check O2 sensors, GM's, or most of them, have one wire from them, no heater.
If more than one wire, then it has a heater within the sensor to heat the tip. The heater may not be power as in a bad relay, no relay control to turn on the relay, or a broken fusible link/blown fuse or a bad sensor internally. But since the report reads Cat OK, PCM is reading the O2 sensors, pre- & post- and comparing the info collected.
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