[kthomas3]

Hi,
I have a CTS 2003 with 66893 miles. I notice a couple times when I step on the brakes and I release BOTH brake lights stay on. This happens even when I park and turn the car off. What can the problem be?

Second question:
I notice when my car is in idle i feel a small subtle tremble/vibration through out the car. feels like a small misfire. I have a check engine light on and the code told me it was my O2 sensor in bank 2. Can this be the reason why I feel that vibration? Also can this O2 sensor in bank 2 (after cat converter) affect my fuel efficiency/economy?

Thanks!