Catalytic Converter code and white smoke

[FTLOT]

Our 2016 Ecoboost threw a code a few weeks ago when it was very cold. It went away on my next fill up but it was the right catalytic converter. I also noticed about that time it seemed like I was seeing more white emissions from the exhaust than previously. The car was running fine though. As the weather has warmed up I still notice a little white smoke before the car warms up totally. But yesterday I was on the highway and put my foot into it to pass and there was quite a bit of smoke from the exhaust.

I check oil levels religiously and it's fine. The coolant seems to be staying normal too. My first thought was possibly a turbo coolant leak but I'm not sure? Any place for me to start looking, or if it's normal that's fine too.

 

[Ryan L]

My 2016 had similar white smoke symptoms as you describe. No codes, though. Coolant was being consumed at such a low rate that I had no idea it was happening. Chalked it up to cold-starts on muggy mornings. (I should have been more diligent about tracking the coolant level than casually eyeballing the reservoir.) Awhile later I finally noticed a small reduction in coolant level. Took it my trusted mechanic and he determined the water pump was failing at 85k miles. He did the repairs and no more white smoke.

 

[twodollars]

Burning coolant can kill a o2 sensor, and foul a cat, and provide some white smoke from the exhaust