2005 chrysler sebring keeps failing emission test, what might be wrong with it?

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Well i took the sebring to pass the emission test but it failed, the service engine light came on and it said to replace the Po101 sensor which is the heater oxygen sensor, well i took the car to the mechanic and they replaced all of the sensors, a broken gasket, and the catalytic converter but the service engine light still lights on, im bringing the car home tomorrow from the mechanics since they did not help at all and im considering taking it to another but before i do that i want to hear other peoples opinion on what might be causing this problem. Even after i replaced all of the sensors if i insert the sensor reader computer it still tells me the car has a faulty sensor but its been replaced! Anyone had this same issue on a car?
 
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