Got about 500 miles from home had a cel come on and the dreaded poor def quality countdown light. Not the first for either. Took to a unknown dealer and was told that it had codes p20ee and p22fe. They informed me that it needed a nox sensor and the p20ee code needs a reflash to the ecm and a manual regen, And def fluid test... none the less it was going to be a $1000 bill. I told them not to touch it, ordered a new nox sensor. Going to trailer it home next week and put the new nox sensor in. Any info/ ideas to the dealers insight? Love the car. But this may be the final straw. Btw car has 42k miles