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Trouble codes

(1997 GMC Sonoma)
in Maple Hill, NC on March 17, 2009
the service eng. light comes on and stays.trouble code is po141 oxygen sensor ,bank 1 sensor 2.all oxygen sensors have been changed twice.
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on March 17, 2009
Code p0141 is a fualt for the O2 sensor heater. You must have 12v and a good ground to the sensor for the heater to work correctly. The pink wire to the sensor should have 12v and the black wire should be ground. If the wiring all checks out ok and the sensor is new as you said, then you may have a faulty engine control computer.
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