This is what I found online. Also link is attached.
Air Fuel Ratio (A/F) Sensor, (sensor 1, located in the exhaust pipe ahead of the convertor) Note: This IS NOT an "Oxygen Sensor" in the standard sense, and cannot be replaced with some cheap after-market (ie: Bosch) Oxygen sensor.
LINK:
http://www.elementownersclub.com/forums/showthread.php?t=48690
Air Fuel Ratio (A/F) Sensor, (sensor 1, located in the exhaust pipe ahead of the convertor) Note: This IS NOT an "Oxygen Sensor" in the standard sense, and cannot be replaced with some cheap after-market (ie: Bosch) Oxygen sensor.
LINK:
http://www.elementownersclub.com/forums/showthread.php?t=48690