Our 2020 PHEV has been showing an emission or exhaust warning for about a year. The dealer can't ID the source. This car was charged outside for it's first 10 months and was severely damage by squirrels. They chewed up wiring harnesses both in front and back. Six weeks later, with shipping delays and other complications, we got the car back. I cleared a spot in the garage to charge it. The phantom error message appeared soon after the repair. Right now it is reading emissions system problem. It has also come up as an exhaust problem. The errors come up at all times, even with no ICE usage. Occasionally it disappears. But returns after a brief period. Has anyone else experienced any warnings like this? I have presumed it be related to the squirrel damage, but has it happened to others?