Chevrolet Repair: P0133 code, 2000 chevy malibu, intake air temp

Question
I have a 2000 Chevy Malibu.I recently replaced my IAT sensor because of the P0133 code.The code still comes back after erasing it.What else can cause this ? A bad pigtail? I read that i should have 5 volts dc at the pig tail.But i could not get a good reading.please help with some guidance,Is there something else i should be looking for? Thank you....Peter

Answer
Hi Peter,

P0133 is all about the Oxygen Sensor.  It means the O2 is slow or faulty.  Change the O2.  Check for connection there.  If still there after that, look for exhaust leak.

PO113 is Intake Air Temp Sensor- high input
high input often can mean the sensor is open circuit, ie disconnectted or missing a power, ground etc, the the sensor or pcm. A bad CAT can cause this.