Recently the “Check Engine” light came on, on my 2005 C6 coupe, 6.0L. The code, according to the diagnostic tool was P0155 (O2 Sensor, Bank 2, Sensor 1). I did replace the O2 sensor on the passenger side of the car, which was located at the front, near the spark plugs. We erased the code, but after 15 miles, it came back on. Any ideas?