Maybe I'm misunderstanding what you wrote, but it sounds like you still have the O2 sensor disconnected, right? When you start your vehicle, the O2 sensor will heat up quicker then the exhaust (this is the heater circuit) so that it can start reading the exhaust gasses sooner and adjust fuel trims to allow the engine to reach operating temperature in the correct amount of time.
If you've left this sensor unplugged after resetting the CEL, the heater circuit will stay on for longer then is allowed by the ECU, which will result in a CEL for the heater circuit on your O2 sensor. Until you replace the sensor, you will continue to have a CEL related to it.
'00 WJ 4.7 Limited- Some stuff
'03 WJ 4.7 Laredo- Some more stuff
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It is what Jeeples has *PARTIALLY* stated.