Either that or it's a late April fools. Jumped on the motorway this evening, set cruise to 72mph. Was in no rush. 3 mins later, ****#$â¬!! check coolant level in red pops up *^#%$$, stop car. Ok, so I hard shoulder it, thought maybe stone had punctured my radiator, nope coolant level fine, right on the max line, right where I left it ....temp gauge at dead 90. Checked OBD straight away (lives in the car) to get an accurate reading and it was at 84c. So normal. Also scanned for faults, clean bill of health - nothing. After restart, light out now - rag her home, technician road test style - flat out. Seemed to drive like she'd been on steroids. Do you think a dodgy coolant level sensor could relate to performance issues? Does this sensor double up as a temperature sensor too? Pretty sure earlier Audi's, maybe the 8L chassis did? As I'm sure that would affect fuelling if the sensor was telling the computer the wrong temperature, and may explain my intermittent feelings of less grunt. Anyway, I can only assume the sensor in the coolant bottle has had enough of life. 30k and 2 years isn't a great lifespan, could warranty it, but think I'll do this myself, cheap fix, probably end up with a new bottom end if the techs at Audi we're let lose on it.