Nah, no black smoke. Funny you should mention the coolant temp sender, plugged in vag com a few weeks ago and it came up with that, So i changed it. No more EML. i've noticed tho that if the car hasnt moved for a few days when its cold, which is quite regular because i use the bike for work, that the temp gauge flashes and beeps when i start the engine, done this before and after i changed it