1995 coupe 48,500 miles. Month ago check engine light on but no sys light. Jump 4&12 on obd2 gives H13 code only, drivers side o2 sensor. Also after check engine light comes on both cooling fans run even though temp at 200 degrees or less. I changed out o2 sensor. Light and code and fans on again. Checked battery and it is good. Car was not idling bad or running rough when light came on. I thought the H meant historic code, so maybe not o2 sensor, as I changed it out once before some time ago. Maybe unrelated but PKE fob working sporadically.  Does this ring a bell with anybody ?

Well I changed out the ebay bargain o2 sensor with a denzo brand. No check engine light and no codes.

Get them all the time that may or may not work properly...it's a crap shoot most of the time. Good to hear it's working well now.

Joel Adams  
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"Money can't buy happiness -- but somehow it's more comforting to cry in a CORVETTE than in a Kia"