Read your thread on the O2 sensor problem you were having with your 2013 ZL1. The wife's 2013 ZL1 just threw a check engine light. Was told by the service rep that it was one of the O2 sensors. Started to search the forum to see if anyone else had the same issue with a 2013 ZL1 and found your thread. It's the first time we take the car in for anything. Hoping it doesn't become a recurring problem like it did with your car. Any more info on what was causing the sensor to go bad? Any service bulletins for that issue? Thanks.