AdBlue

A few weeks back when it was very warm whilst driving I had emission error show on the console - engine fault requires repair with the AdBlue mileage countdown until car can’t be started warning.

The AdBlue was running low so I topped it up and also added some anti-crystalisation fluid. Since then I’ve done over 100 miles and the problem hasn’t cured itself. The car itself runs fine and there aren’t any noticeable bad emmisions.

Any ideas or suggestions.

Thanks!