diag code p1122
 

check engine light on diag code p1122. Can someone tell what this means and how do I fix it. Also, oil temp gauge not working, had it to several dealers and they all claim they don't know where problem is.. does anyone know where the sending unit is and how do I test it. I have the online service manual for car and I'm not having much success finding it.
The car is a 2000 A6 quattro.. Thanks Michael

P1122
O2 Sensor Heater Circ.,Bank2-Sensor2 Open

Oil temp gage - Find someone that knows what they are doing