So I finally decided to see if any codes were being thrown even though there are no lights on. I was surprised when I got 7 different 02 sensor errors. I have a 1996 A4 Quattro. Here are the codes.

P0134 O2 Sensor Circ.,Bank1-Sensor1 No Activity Detected
P1101 O2 Sensor Circ.,Bank1-Sensor1Voltage too Low/Air Leak
P0130 O2 Sensor Circ.,Bank1-Sensor1 Malfunction
P0161 O2 Sensor Heater Circ.,Bank2-Sensor2 Malfunction
P0141 O2 Sensor Heater Circ.,Bank1-Sensor2 Malfunction
P0158 O2 Sensor Circ.,Bank2-Sensor2 High Voltage
P0138
O2 Sensor Circ.,Bank1-Sensor2 Low Voltage

Would there be something bigger causing all these codes? Or are they all separate issues?

 

I would clear them all and drive for a while (~50 miles) then check again.

Sometimes random errors occur when you lose a battery connection or stall the car or something.

 

Ok, ill give that a try. Thanks.