I took my 2016 Tahoe into my dealership for service. I was advised to have a fuel treatment done, which I did. After the service, the check engine light comes on. I returned to the dealership and was told the fuel treatment increased the emissions temperature and can throw an emissions code. I was advised to drive the vehicle a few days to see if the light goes out. It did not. Now I am being told the catalytic converter will need to be replaced. Thankfully, it is still under warranty. However, the dealership now acts as if the fuel treatment had nothing to do with the problem and if it was not still under warranty I would be responsible for the cost of replacing the converter! Just wondering if anyone else has had this issue and what would be my options if the vehicle was not under warranty? The Tahoe only has 32,000 miles on it. I am new to this site, but didn't find anything on my search for fuel treatment issues.