The EML came on the other day,and I was told to take it to a garage who have a VAG. Com so that it could be tested to see what was wrong with it, which I did. They checked it and said it was a water sensor that was faulty which they changed, they didnt check too see if there was any water leakages around the car they just changed the sensor. A few hours later when I restarted the car the EML came on again. Any ideas.

What actual fault was it coming up with?

All the mechanic said, It was showing a water leak somewhere, so he changed the sensor.