Originally Posted by valeram
Just add a quarter of a liter and check. This will verify if you have a bad sensor, which I don't think you have.
In my experience with the same type of sensor, having the same type of issue as the OP, they are not bad, just SESITIVE to a lot of factors. the last thing you want to do IMHO is overfill, and it is easy for the dealer to check for you without adding any oil.
I would bet the dealer will come back and tell you it is normal for the sensor, and there is not a problem.
But what do I know
Also the OP had just done his 1200 mi service, therefore if the tech new what he was doing, lol, it would have been full one would think.