CEL is on today. Code:P0153 Oxygen Sensor Bank2 Sensor1 slow response
Just did timing belt job. The car is running fine. After 50 miles of driving, the cel is on with P0153. It is the front driver side O2 sensor. Before I purchased this car, two O2 sensors were replaced at 120K. Those two sensors(I remembered) are located on the driver side as well. Now the car has 137K. So what kind of problem do I have here? Is it related to timing belt replacement? Also, I added some engine oil after timing belt job. It is over the MAX mark now. Will that cause the O2 to fail? Thanks!
99.5 A4 2.8L AHA Manual Quattro
>H&R and Bilstein Suspension Combo @135K
>Control Arms and CV shafts rebuilt @135K
>Timing Belt Kits and VC Gasket Kits @137K