I finally had a check engine light come on one of our Mirage's. Car is a 2015 cvt with 232000kms on it. Code is P0421 Warm Up Catalyst Efficiency Below Threshold. It came yesterday afternoon, still runs and drives fine. I was able to clear the light but my scan tool says the code is permanent. Guess I'll have to fix before that goes away for good. I haven't had time to check the O2 sensors yet. I'll keep you posted what I find. Luckily if the cat is junk I have a spare with about 30k from our parts car that got hit by a garbage truck and I'll soon have 1 for sure, possible 2 parts cars on the way as well. Gotta love winter!